Performance resistance monitoring system and method for coupling loading of CFRP part in load environment

Abstract

The invention provides a performance resistance monitoring system and method of a load environment coupling loading CFRP part, and relates to the technical field of carbon fiber composite materials. The system comprises a stress loading regulation and control assembly, a water circulation assembly, a radial resistance detection assembly and a transverse resistance monitoring assembly, and aims to realize dynamic monitoring of the conductivity, the water absorption rate and the damage process of the material by monitoring the resistance change rule of the CFRP in real time. The system comprises a stress loading regulation and control assembly, a radial resistance monitoring assembly, a water circulation assembly and a transverse resistance monitoring assembly. Through long-term resistance monitoring, analysis of the corresponding relation between the mechanical property and the resistance, establishment of an empirical model formula and estimation of the degradation degree of the mechanical property, the invention provides an efficient and non-destructive evaluation means; the method is used for predicting the service life of the CFRP and guiding maintenance and replacement strategies. According to the method, real-time dynamic monitoring of the conductivity, the water absorption rate and the damage process of the CFRP under the force-salt-heat-humidity multi-factor coupling effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon fiber composite materials, and in particular to a performance resistance monitoring system and method for a load-environment coupled loaded CFRP component. Background Art

[0002] CFRP is used in aviation, aerospace, military, communications, sports, construction and other fields due to its advantages such as high specific strength, high specific modulus, low density, corrosion resistance and strong design. In various civil engineering working conditions such as ocean, surface and deep earth, pultruded CFRP rods / plates and other structures are commonly used products of composite materials. Under certain working stress conditions, CFRP rods / plates are usually accompanied by certain humidity, salt, temperature and other influences, which lead to performance degradation. At present, there is still a lack of effective monitoring means and evaluation models for the performance monitoring of pultruded CFRP rods / plates under the coupling of multiple factors, especially the non-destructive online dynamic monitoring of water absorption and damage process. Summary of the invention

[0003] In order to solve a technical problem existing in the prior art, the embodiment of the present invention provides a performance resistance monitoring system and method for a load environment coupled loading CFRP part, which realizes dynamic monitoring of the conductivity, water absorption and damage process of the carbon fiber composite material by real-time monitoring of the resistance change law of the composite material, and establishes an empirical model for evaluating the conductivity, water absorption and mechanical performance attenuation law of the material under the long-term multi-factor coupling effect. The technical solution is as follows:

[0004] A performance resistance monitoring system for a load-environment coupled loaded CFRP component, comprising:

[0005] A stress loading regulating component, on which both ends of the CFRP component are loaded, and the stress loading regulating component can perform constant stress or variable stress loading on the CFRP component, wherein the CFRP component is a CFRP plate or a CFRP rod, and the water circulation component, the radial resistance detection component and the transverse resistance monitoring component are installed on the stress loading regulating component;

[0006] a water circulation component, through which the CFRP component passes, and the water circulation component is used to simulate the use environment of the CFRP component, wherein the water circulation component supports regulating the salt water concentration, temperature and humidity in the use environment of the CFRP component according to the actual environment;

[0007] A radial resistance detection component, used to detect a change in resistance of the CFRP member in a first direction, wherein the first direction is parallel to a fiber direction of the CFRP member;

[0008] The transverse resistance detection component is used to detect the change of the resistance value of the CFRP member in a second direction, and the second direction is perpendicular to the fiber direction of the CFRP member.

[0009] Optionally, the stress loading regulation component includes:

[0010] A mold fixing base, wherein the mold fixing base is arranged horizontally;

[0011] A first mold fixing bracket and a second mold fixing bracket, wherein the first mold fixing bracket and the second mold fixing bracket are symmetrically mounted at two ends of the upper surface of the first mold fixing base;

[0012] A mold driving assembly, the mold driving assembly is installed on the mold fixing base and is arranged on the mold second fixing bracket side;

[0013] An anchor, one end of which is mounted on the first fixing bracket, the other end of which is mounted on the first-mold driving assembly, and both ends of the CFRP member are mounted in both ends of the anchor;

[0014] A force sensor, the force sensor being mounted on the first fixed support side of the first mold and on the anchor;

[0015] A first-mode controller, the first-mode controller is respectively connected to the force sensor and the first-mode drive assembly by telecommunication;

[0016] Wherein, the one-mold driving assembly supports and drives the anchor on the same end side to move horizontally.

[0017] Optionally, the first-mode driving component includes:

[0018] A servo motor support, the servo motor support being mounted on the surface of the first mold fixed base;

[0019] A servo motor, wherein the servo motor is mounted on the servo motor support;

[0020] A first gear and a second gear, wherein upper and lower ends of the second gear are respectively meshed with the first gear, and the second gear is connected to the servo motor through a coupling;

[0021] Screw rods, two of the screw rods are arranged in parallel, and one end of the two screw rods is respectively installed at the center of the two first gears;

[0022] A support plate, wherein two threaded holes are arranged on the support plate, and the two threaded holes are respectively adapted to the two screw rods, and an end of the anchor away from the first fixed bracket of the first mold is arranged on the end side of the support plate away from the first fixed bracket of the first mold, and the CFRP part passes through the support plate and is installed on the end of the anchor away from the first fixed bracket of the first mold;

[0023] When the servo motor drives the second gear to rotate, the second gear drives the two first gears to rotate, and the two first gears respectively drive the corresponding screws to rotate, the support plate moves along the horizontal direction of the screw and drives the two ends of the anchor to move closer or farther away from each other.

[0024] Optionally, the water circulation component comprises:

[0025] A target water pipe, wherein the target water pipe is arranged above the first mold fixed base, one end of the target water pipe is blocked by a first silicone plug, and the other end of the target water pipe is blocked by a third silicone plug, the CFRP component passes through the first silicone plug, the target water pipe and the third silicone plug in sequence, and the target water pipe is installed in a target water pipe insulation sleeve;

[0026] An electric heating pipe, an electric heating belt is installed on the outer wall of the electric heating pipe, an electric heating belt insulation sleeve is arranged on the outer wall of the electric heating belt, the electric heating belt insulation sleeve is installed on the first fixed support of the electric heating pipe and the second fixed support of the electric heating pipe, and the first fixed support of the electric heating pipe and the second fixed support of the electric heating pipe are installed on the upper surface of the first mold fixed base;

[0027] A three-mode controller, the three-mode controller is mounted on the three-mode controller support, the three-mode controller support is mounted on the upper surface of the one-mode fixed base, the three-mode controller is electrically connected to the electric heating belt and the temperature sensor, and the temperature sensor is mounted in the target water pipe;

[0028] A first hose, a second hose and a third hose, one end of the first hose is connected to one end of the electric heating pipe, the other end of the first hose is connected to a circulating water pump, the other end of the circulating water pump is connected to one end of the second hose, the other end of the second hose is connected to the end side wall of one end of the target water pipe through a first tee, one end of the third hose is connected to the other end of the electric heating pipe, and the other end of the third hose is connected to the end side wall of the other end of the target water pipe through a third tee;

[0029] Wherein, a first hose insulation sleeve is provided on the first hose, a second hose insulation sleeve is provided on the second hose, a third hose insulation sleeve is provided on the third hose, and the circulating water pump is electrically connected to the three-mode controller;

[0030] A water level monitoring pipe, which is vertically installed above the target water pipe and connected to the target water pipe through a second tee, and a second silicone plug is provided at the end of the water level monitoring pipe;

[0031] A drain valve and a water tank, a fourth three-way connection is arranged on the electric heating pipe and on the same side as the third hose, the fourth three-way connection is connected to the electric heating pipe and the third hose, a drain valve is arranged at the other end of the fourth three-way connection, and a water tank is arranged below the drain valve;

[0032] Optionally, the lateral resistance detection component:

[0033] A four-mode resistance recorder, wherein the four-mode resistance recorder is mounted on the four-mode resistance recorder support, and the four-mode resistance recorder support is mounted on the one-mode fixed base;

[0034] A four-mode first wire and a four-mode second wire, one end of the four-mode first wire and the four-mode second wire are respectively connected to the four-mode resistance recorder, the other end of the four-mode first wire is provided with m parallel branches, each branch of the four-mode first wire is connected to a four-mode wet transverse resistance electrode, the four-mode wet transverse resistance electrode is arranged on the CFRP part, the other end of the four-mode second wire is provided with m parallel branches, each branch of the four-mode second wire is connected to a four-mode dry transverse resistance electrode, and the four-mode dry transverse resistance electrode is provided with a CFRP part coated with a four-mode hydrophobic coating;

[0035] A four-mode silicone rubber capillary sleeve is installed on the four-mode first conductor and the four-mode second conductor.

[0036] Optionally, the longitudinal resistance detection component includes:

[0037] A two-mode resistance recorder, the two-mode resistance recorder is mounted on a two-mode resistance recorder support, and the two-mode resistance recorder support is mounted on the one-mode fixed base;

[0038] A second-mode first wire, a second-mode second wire and a second-mode third wire, one end of the second-mode first wire is connected to the second-mode first electrode, the other end of the second-mode first wire is connected to the second-mode resistance recorder, one end of the second-mode second wire is connected to the second-mode second electrode, the other end of the second-mode second wire is connected to the second-mode resistance recorder, one end of the second-mode third wire is connected to the second-mode third electrode, the other end of the second-mode third wire is connected to the second-mode resistance recorder,

[0039] Wherein, the second-mode first electrode, the second-mode second electrode and the second-mode third electrode are evenly installed on the CFRP part and in the target water pipe, the second-mode first wire, the second-mode second wire and the second-mode third wire are provided with a second-mode silicone rubber capillary sleeve;

[0040] Wherein, a CFRP hydrophobic coating is provided on the CFRP member between the second-mode first electrode and the second-mode second electrode;

[0041] The second-mode first electrode, the second-mode second electrode and the second-mode third electrode have the same structure.

[0042] Optionally, the second-mode first electrode comprises: a metal electrode, a highly conductive glue and an electrode hydrophobic coating;

[0043] The metal electrode is mounted on the CFRP part through the highly conductive adhesive;

[0044] The surface of the metal electrode is coated with an electrode hydrophobic coating.

[0045] Optionally, the electric heating belt is a glass fiber heating belt, a carbon fiber heating belt or a silicone rubber heating belt.

[0046] A performance resistance monitoring method for a CFRP component under load-environment coupling loading, comprising:

[0047] Installing the CFRP component on the anchor, wherein a conductive sheet and a coating are pre-arranged on the CFRP component according to preset requirements;

[0048] Adding solution from the water level monitoring pipe into the target water pipe according to preset requirements until the target height is reached, and adjusting the temperature in the target water pipe through the water circulation component;

[0049] Adjust the stress on the CFRP part based on the stress loading control component;

[0050] At every preset time interval, the resistance values ​​on the two-mode resistance recorder and the four-mode resistance recorder are collected and uploaded to the host computer;

[0051] Wherein, the water level in the water level monitoring tube is regularly detected, and if it is lower than a preset water level, the solution is replenished;

[0052] When the resistance value detection times reaches the preset requirement, the electric heating tube stops working, the solution is discharged through the drain valve, and the stress applied to the CFRP part is unloaded through the stress loading and regulating component;

[0053] Based on the data of the two-mode resistance recorder, the data of the four-mode resistance recorder and the parameters of the solution, an empirical model between the resistance and the water absorption rate of the CFRP part and the mechanical properties of the CFRP part is obtained.

[0054] Optionally, the empirical model between the resistance and the water absorption rate of the CFRP part and the mechanical properties of the CFRP part includes:

[0055] The effect of water absorption on the electrical conductivity of CFRP parts is expressed as formula (1):

[0056] Gwater =G2-G1= L2 / ( A ρ2)- L1 / ( A ρ1);(1)

[0057] in, G wate is the change in CFRP conductivity caused by moisture absorption, G1 is the conductivity of the non-hygroscopic section, G2 is the conductivity of the hygroscopic section, A is the area of ​​the CFRP cross section, ρ1 is the resistivity of the non-hygroscopic section, ρ2 is the resistivity of the hygroscopic section, L1 is the length of the non-hygroscopic section, and L2 is the length of the hygroscopic section;

[0058] The change of the conductivity of the non-hygroscopic composite material under long-term load-environment coupling is expressed as formula (2):

[0059] G1 t =G1 t -G1 0 =L1 t / ( A ρ1 t )- L1 0 / ( A ρ1 0 );(2)

[0060] in, G1 t G1 is the change in water absorption rate of the non-hygroscopic CFRP part under long-term load-environment coupling, t G1 is the electrical conductivity of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, 0 L1 is the electrical conductivity of the non-hygroscopic CFRP part during the initial load-environment coupling loading. t is the length of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, ρ1 t L1 is the resistance of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, 0 is the length of the non-hygroscopic CFRP section when the load-environment coupling loading is initially applied, ρ1 0 The resistance of the non-hygroscopic CFRP part during the initial load-environment coupling loading;

[0061] The prediction formula for the change of conductivity of the composite material in the hygroscopic section under the coupling of long-term load environment is formula (3):

[0062] G2 t =G2 t -G2 0 =L2 t / ( A ρ2 t )-L2 0 / ( A ρ2 0 );(3)

[0063] in, G2 t G2 is the change in water absorption rate of the CFRP component under long-term load-environment coupling in the moisture absorption section. t G2 is the conductivity of the CFRP component in the moisture absorption section under the long-term load-environment coupling at the service time t, 0 is the electrical conductivity of the CFRP component in the moisture absorption section when the load-environment coupling loading is initially performed, L2 t is the length of the hygroscopic section of the CFRP component under the long-term load-environment coupling at the service time t, ρ2 t is the resistance of the CFRP component in the moisture absorption section under the long-term load-environment coupling at the service time t, L2 0 is the length of the CFRP part in the moisture absorption section when the load-environment coupling loading is initially performed, ρ2 0 It is the resistance of the hygroscopic section CFRP component when it is initially subjected to load-environment coupling loading.

[0064] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0065] 1. Realize real-time dynamic monitoring of the conductivity, water absorption rate and damage process of CFRP under the coupling of multiple factors of force, salt, heat and humidity.

[0066] 2. Establish an empirical model to provide a scientific basis for evaluating the water absorption rate and mechanical property attenuation of CFRP under the long-term multi-factor coupling.

[0067] 3. It provides an efficient and non-destructive evaluation method for long-term performance monitoring of CFRP.

[0068] 4. Improve the accuracy of CFRP service life prediction and provide guidance for material maintenance and replacement. This has important practical significance for predicting the service life of materials and guiding maintenance and replacement strategies.

[0069] 5. The water circulation component used in the present invention consumes less solution mass and is easy to replace and adjust, thus providing better experimental convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0071] Figure 1 A schematic diagram of the overall structure of the system provided by an embodiment of the present invention;

[0072] Figure 2 A schematic diagram of a stress loading control component (referred to as: first module) provided in an embodiment of the present invention;

[0073] Figure 3 (a) is a schematic diagram of a radial resistance monitoring assembly (abbreviated as: second model) provided in an embodiment of the present invention. Figure 3 (b) is a cross-sectional view of the electrode position of the non-hygroscopic section of the CFRP radial resistor provided by an embodiment of the present invention. Figure 3 (c) is a cross-sectional view of a CFRP radial resistance non-hygroscopic composite material test section provided by an embodiment of the present invention;

[0074] Figure 4 A schematic diagram of a water circulation assembly (referred to as: three-module) provided in an embodiment of the present invention;

[0075] Figure 5 (a) is a schematic diagram of a transverse resistance monitoring assembly (abbreviated as: four-mode) provided in an embodiment of the present invention, Figure 5 (b) is a side view of a lateral resistor electrode provided by an embodiment of the present invention, Figure 5 (c) is a side view of an electrode with a transverse resistor perpendicular to the fiber cutting surface provided by an embodiment of the present invention. Figure 5 (d) is a schematic diagram of the transverse resistance detection principle provided in an embodiment of the present invention.

[0076] Reference numerals:

[0077] 1-1, first mold fixed base; 1-2, first mold first fixed bracket; 1-3, first mold second fixed bracket; 1-41, servo motor support; 1-42, servo motor; 1-43, first gear; 1-44, second gear; 1-45, screw; 1-46, support plate; 1-5, anchor; 1-6, force sensor; 1-7, first mold controller;

[0078] 2-1, two-mode resistance recorder; 2-2, two-mode first conductor; 2-3, two-mode second conductor; 2-4, two-mode third conductor; 2-5, two-mode first electrode; 2-51, metal electrode; 2-52, high conductive glue; 2-53 electrode hydrophobic coating; 2-6, two-mode second electrode; 2-7, two-mode third electrode; 2-8, CFRP hydrophobic coating;

[0079] 3-1, target water pipe; 3-2, electric heating pipe; 3-21, electric heating belt; 3-3, three-mode controller; 3-4, first hose; 3-5, second hose; 3-6, third hose; 3-7, water level monitoring pipe; 3-8, water tank; 3-9, circulating water pump; 3-10, drain valve;

[0080] 4-1, four-mode resistance recorder; 4-2, four-mode first wire; 4-3, four-mode second wire; 4-4, four-mode wet transverse resistance electrode; 4-5, four-mode dry transverse resistance electrode; 4-6, four-mode hydrophobic coating;

[0081] 5. CFRP parts. DETAILED DESCRIPTION

[0082] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0083] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0084] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0085] like Figures 1 to 5 As shown, a performance resistance monitoring system for a load-environment coupled loaded CFRP component comprises: a stress loading regulating component, a water circulation component, a radial resistance detection component and a transverse resistance monitoring component, both ends of a CFRP component 5 are loaded on the stress loading regulating component, the stress loading regulating component can perform constant stress or variable stress loading on the CFRP component 5, wherein the CFRP component 5 is a CFRP plate or a CFRP rod, and the water circulation component, the radial resistance detection component and the transverse resistance monitoring component are installed on the stress loading regulating component; the CFRP component 5 passes through the water circulation component, the water circulation component is used to simulate the use environment of the CFRP component 5, wherein the water circulation component supports regulating the salt water concentration, temperature and humidity in the use environment of the CFRP component 5 according to the actual environment; the radial resistance detection component is used to detect the change of the resistance value of the CFRP component 5 in a first direction, the first direction is parallel to the fiber direction of the CFRP component 5; the transverse resistance monitoring component is used to detect the change of the resistance value of the CFRP component 5 in a second direction, the second direction is perpendicular to the fiber direction of the CFRP component 5.

[0086] The CFRP component is a composite material, such as a carbon fiber composite material.

[0087] In a specific implementation manner, the stress loading and regulating component includes: a mold fixed base 1-1, a mold first fixed bracket 1-2, a mold second fixed bracket 1-3, a mold driving component, an anchor 1-5, a force sensor 1-6 and a mold controller 1-7; the mold fixed base 1-1 is horizontally arranged; the mold first fixed bracket 1-2 and the mold second fixed bracket 1-3 are symmetrically installed at both ends of the upper surface of the mold fixed base 1-1; the mold driving component is installed on the mold fixed base 1-1 and is arranged on the mold The second fixed bracket 1-3 side; one end of the anchor 1-5 is installed on the first fixed bracket, the other end of the anchor 1-5 is installed on the one-mold driving assembly, and both ends of the CFRP component 5 are installed in both ends of the anchor 1-5; the force sensor 1-6 is installed on the one-mold first fixed bracket 1-2 side and installed on the anchor 1-5; the one-mold controller 1-7 is respectively connected to the force sensor 1-6 and the one-mold driving assembly by telecommunications; the one-mold driving assembly supports and drives the anchor 1-5 on the same end side to move horizontally.

[0088] In a specific implementation manner, the one-mold driving assembly includes: a servo motor support 1-41, a servo motor 1-42, a first gear 1-43, a second gear 1-44, a screw 1-45 and a support plate 1-46, wherein the servo motor support 1-41 is mounted on the surface of the one-mold fixed base 1-1; the servo motor 1-42 is mounted on the servo motor support 1-41; the upper and lower ends of the second gear 1-44 are respectively engaged with the first gear 1-43, and the second gear 1-44 is connected to the servo motor 1-42 through a coupling; the two screws 1-45 are arranged in parallel, and one end of the two screws 1-45 is respectively mounted on the center of the two first gears 1-43; two screws are arranged on the support plate 1-46. The two threaded holes are respectively matched with the two screw rods 1-45, and the end of the anchor 1-5 away from the first fixed bracket 1-2 of the first mold is arranged on the end side of the support plate 1-46 away from the first fixed bracket 1-2 of the first mold, and the CFRP part 5 passes through the support plate 1-46 and is installed on the end of the anchor 1-5 away from the first fixed bracket 1-2 of the first mold; when the servo motor 1-42 drives the second gear 1-44 to rotate, the second gear 1-44 drives the two first gears 1-43 to rotate, and the two first gears 1-43 respectively drive the corresponding screw rods 1-45 to rotate, and the support plate 1-46 moves along the horizontal direction of the screw rod 1-45 while driving the two ends of the anchor 1-5 to be relatively close or away.

[0089] In a specific embodiment, the water circulation component comprises:

[0090] A target water pipe 3-1, wherein the target water pipe 3-1 is arranged above the first mold fixed base 1-1, one end of the target water pipe 3-1 is blocked by a first silicone plug, and the other end of the target water pipe 3-1 is blocked by a third silicone plug, the CFRP component 5 passes through the first silicone plug, the target water pipe 3-1 and the third silicone plug in sequence, and the target water pipe 3-1 is installed in a heat-insulating sleeve of the target water pipe 3-1;

[0091] An electric heating tube 3-2, an electric heating belt 3-21 is installed on the outer wall of the electric heating tube 3-2, an electric heating belt 3-21 insulation sleeve is arranged on the outer wall of the electric heating belt 3-21, the electric heating belt 3-21 insulation sleeve is installed on the first fixed support of the electric heating tube 3-2 and the second fixed support of the electric heating tube 3-2, and the first fixed support of the electric heating tube 3-2 and the second fixed support of the electric heating tube 3-2 are installed on the upper surface of the first mold fixed base 1-1;

[0092] A three-mode controller 3-3, wherein the three-mode controller 3-3 is installed on the three-mode controller 3-3 support, and the three-mode controller 3-3 support is installed on the upper surface of the one-mode fixed base 1-1. The three-mode controller 3-3 is electrically connected to the electric heating belt 3-21 and the temperature sensor, and the temperature sensor is installed in the target water pipe 3-1; the temperature sensor supports detecting the temperature in the target water pipe. When the temperature in the target water pipe detected by the temperature sensor is higher than the required temperature, the heating belt is stopped from heating until the temperature in the target water pipe drops to the required temperature range. The heating belt heats and controls the temperature of the circulating water to be within the required temperature range. If the temperature in the target water pipe is lower than the required temperature, the heating belt is heated.

[0093] A first hose 3-4, a second hose 3-5 and a third hose 3-6, one end of the first hose 3-4 is connected to one end of the electric heating pipe 3-2, the other end of the first hose 3-4 is connected to a circulating water pump 3-9, the other end of the circulating water pump 3-9 is connected to one end of the second hose 3-5, the other end of the second hose 3-5 is connected to the end side wall of one end of the target water pipe 3-1 through a first tee, one end of the third hose 3-6 is connected to the other end of the electric heating pipe 3-2, and the other end of the third hose 3-6 is connected to the end side wall of the other end of the target water pipe 3-1 through a third tee;

[0094] The first hose 3-4 is provided with a first hose 3-4 insulation sleeve, the second hose 3-5 is provided with a second hose 3-5 insulation sleeve, the third hose 3-6 is provided with a third hose 3-6 insulation sleeve, and the circulating water pump 3-9 is electrically connected to the three-mode controller 3-3;

[0095] A water level monitoring pipe 3-7, which is vertically installed above the target water pipe 3-1 and connected to the target water pipe 3-1 through a second tee, and a second silicone plug is provided at the end of the water level monitoring pipe;

[0096] A drain valve 3-10 and a water tank 3-8 are provided on the electric heating tube 3-2 and on the same side as the third hose 3-6. The fourth three-way is connected to the electric heating tube 3-2 and the third hose 3-6. The other end of the fourth three-way is provided with a drain valve 3-10, and a water tank 3-8 is provided below the drain valve 3-10.

[0097] In a specific implementation manner, the lateral resistance detection component:

[0098] A four-mode resistance recorder 4-1, wherein the four-mode resistance recorder 4-1 is mounted on the four-mode resistance recorder 4-1 support, and the four-mode resistance recorder 4-1 support is mounted on the one-mode fixed base 1-1;

[0099] A four-mode first wire 4-2 and a four-mode second wire 4-3, one end of the four-mode first wire 4-2 and the four-mode second wire 4-3 are respectively connected to the four-mode resistance recorder 4-1, and the other end of the four-mode first wire 4-2 is provided with m parallel branches, each branch of the four-mode first wire 4-2 is connected to a four-mode wet transverse resistance electrode 4-4, and the four-mode wet transverse resistance electrode 4-4 is arranged on the CFRP part 5, and the other end of the four-mode second wire 4-3 is provided with m parallel branches, each branch of the four-mode second wire 4-3 is connected to a four-mode dry transverse resistance electrode 4-5, and the four-mode dry transverse resistance electrode 4-5 is provided with a CFRP part 5 coated with a four-mode hydrophobic coating 4-6;

[0100] A four-mode silicone rubber capillary sleeve is installed on the four-mode first conductor 4-2 and the four-mode second conductor 4-3.

[0101] In a specific implementation manner, the longitudinal resistance detection component includes:

[0102] A two-mode resistance recorder 2-1, the two-mode resistance recorder 2-1 is installed on a two-mode resistance recorder 2-1 support, and the two-mode resistance recorder 2-1 support is installed on the one-mode fixed base 1-1;

[0103] The second-mode first wire 2-2, the second-mode second wire 2-3 and the second-mode third wire 2-4, one end of the second-mode first wire 2-2 is connected to the second-mode first electrode 2-5, the other end of the second-mode first wire 2-2 is connected to the second-mode resistance recorder 2-1, one end of the second-mode second wire 2-3 is connected to the second-mode second electrode 2-6, the other end of the second-mode second wire 2-3 is connected to the second-mode resistance recorder 2-1, one end of the second-mode third wire 2-4 is connected to the second-mode third electrode 2-7, the other end of the second-mode third wire 2-4 is connected to the second-mode resistance recorder 2-1,

[0104] The second-mode first electrode 2-5, the second-mode second electrode 2-6 and the second-mode third electrode 2-7 are evenly installed on the CFRP part 5 and in the target water pipe 3-1, and the second-mode first wire 2-2, the second-mode second wire 2-3 and the second-mode third wire 2-4 are provided with a second-mode silicone rubber capillary sleeve;

[0105] Wherein, a CFRP hydrophobic coating 2-8 is provided on the CFRP member 5 between the second-mode first electrode 2-5 and the second-mode second electrode 2-6;

[0106] Among them, the second-mode first electrode 2-5, the second-mode second electrode 2-6 and the second-mode third electrode 2-7 have the same structure.

[0107] In a specific practical manner, the second-mode first electrode 2-5 includes: a metal electrode 2-51, a highly conductive adhesive 2-52 and an electrode hydrophobic coating 2-53; the metal electrode 2-51 is installed on the CFRP part 5 through the highly conductive adhesive 2-52; the surface of the metal electrode 2-51 is coated with the electrode hydrophobic coating 2-53. The electric heating belt 3-21 is a glass fiber heating belt, a carbon fiber heating belt or a silicone rubber heating belt.

[0108] The force sensor 1-6 is a spoke type sensor with a maximum sensor range of 5t. The load applied to the composite material (CFRP part 5) is 25KN. The first fixed bracket 1-2 of the first mold is made of I-beam, the fixed base 1-1 of the first mold is a 50mm thick steel plate, the high-strength screw 1-45 is made of 12.9 grade semi-threaded high-strength screw 1-45, the gasket is a die steel annular gasket, the gear and coupling are made of stainless steel or low carbon steel, and the servo motor 1-42 is a high-torque AC gear reduction motor. The target water pipe 3-1 and the heating pipe can be selected from PTFE pipes, titanium pipes, quartz pipes, and stainless steel pipes with good corrosion resistance and temperature resistance according to the type of solution. The above-mentioned related hoses can be selected from plastic pipes with good elasticity and deformability such as silicone pipes. The electric heating belt 3-21 uses a glass fiber heating belt. The solution is a 10% sodium chloride aqueous solution.

[0109] The specific principles of the present invention include:

[0110] The amount of moisture in the composite material has a direct impact on the resistivity or conductivity of the composite material. Therefore, the moisture content of the CFRP sample in the longitudinal direction can be determined under the coupling of multiple factors such as force, salt, heat and humidity. and lateral resistance such as width and thickness For long-term monitoring, the system can obtain the resistance over time. The change process of the composite material gradually increases during this process, and the salt ions gradually penetrate into the composite material. The increase of the water content and salt ion concentration inside the composite material can improve the conductivity of the composite material or reduce the resistivity. The two have a significant positive correlation. Therefore, this principle can be used to achieve long-term dynamic non-destructive monitoring of the water absorption rate of the composite material.

[0111] In addition, since the composite material is tested under the coupling of multiple factors such as force, salt, heat and humidity, especially the presence of prestress at a certain load level inside the composite material, under the long-term coupling of the load environment, the small defects inside the composite material are more likely to expand compared to those without force. The expansion of defects inside the composite material will cause a sudden change in the resistivity or conductivity of the material itself. Therefore, long-term resistance monitoring of CFRP samples can be performed to achieve real-time non-destructive monitoring of internal damage in the composite material. Furthermore, by comparing and analyzing the mechanical properties of CFRP under different experimental conditions, , such as the corresponding relationship between tensile strength, tensile modulus, interlaminar shear strength, flexural strength, flexural modulus, etc. and the change of resistance or conductivity, revealing the intrinsic connection between material performance attenuation and resistance change. Long-term monitoring and The change law of resistance is studied, and the corresponding relationship between the resistance change and the water absorption rate and mechanical property test results is analyzed. The water absorption rate and mechanical property attenuation degree of CFRP are predicted by testing the resistance.

[0112] In this In the resistance system, since carbon fiber is composed of microcrystals stacked in a chaotic layer of graphite, the water absorption rate is extremely low and the resistance can be considered constant. However, the transition layer between two adjacent carbon fibers has a certain proportion of resin. Under the coupling of long-term load environment, the water content and salt ions in the transition layer of the composite material increase, which will lead to a decrease in the resistance in the transition layer. Therefore, the change law of the water content and salt ion concentration in the composite material can be indirectly calculated by long-term monitoring of the change law of the lateral resistance.

[0113] Furthermore, by comparing and analyzing the sudden changes in the longitudinal or transverse resistance or conductivity of the composite material in the moisture absorption section, the change law of the damage in the composite material can be monitored in real time. By testing and analyzing the mechanical properties of composite materials under different experimental conditions, such as tensile strength, tensile modulus, interlaminar shear strength, bending strength, bending modulus, etc., the corresponding relationship between the attenuation law of the mechanical properties of composite materials and the change of resistance or conductivity after long-term load-environment coupling aging experiments is analyzed, revealing the intrinsic connection between material performance attenuation and resistance change, and predicting the degree of attenuation of CFRP mechanical properties by testing resistance.

[0114] The specific steps are as follows:

[0115] A performance resistance monitoring method for a CFRP component under load-environment coupling loading, comprising:

[0116] S1. Install the CFRP component on the anchor, wherein the CFRP component is pre-arranged with a conductive sheet and a coating according to preset requirements. Specifically, it includes:

[0117] Installation and anchoring: CFRP is cut into a certain length, a conductive sheet or coating is attached to a specific position on the CFRP surface, and a waterproof coating or waterproof membrane is sprayed on a specific part. The CFRP rod passes through the force sensor, water circulation components, etc. in sequence, and the two ends of the CFRP are mechanically clamped and anchored or bonded with anchors.

[0118] S2, according to preset requirements, add solution from the water level monitoring pipe to the target water pipe until the target height is reached, and adjust the temperature in the target water pipe through the water circulation component. Specifically including:

[0119] Inject solution: prepare the solution type required for the aging test, and inject the solution from the water injection port at the upper end of the water level monitoring tube until it reaches a certain height in the water level monitoring tube. Set the temperature controller's temperature rise and fall program and run it.

[0120] The working method of the water circulation component is: inject a low-temperature solution (1 degree-10 degrees) into the water level monitoring pipe of the system, the solution below the target temperature, and then enters the water circulation system of the system. The temperature sensor and the heating pipe heat the solution until the target temperature is reached (to determine whether the target temperature is reached, temperature sensors can be set in the heating pipe and the target water pipe respectively, and the temperature sensor is monitored in real time). When heated to the target temperature, the temperature may continue to rise. Generally, the simulated internal environment temperature will also have a temperature fluctuation range. As long as the target temperature is within this range, the aging process of CFRP parts under this temperature condition can be simulated.

[0121] S3. Based on the stress loading control component, the stress on the CFRP part is adjusted, the stress level and other parameters of the stress controller are set, and the CFRP is stressed according to the set program. The relevant program control method can be controlled according to the existing technology in this field, and will not be described in detail here.

[0122] S4, collecting resistance values ​​on the two-mode resistance recorder and the four-mode resistance recorder once every preset time period and uploading the collected values ​​to the host computer; regularly checking the water level in the water level monitoring tube, and if it is lower than the preset water level, replenishing the solution;

[0123] The specific operation is: open the relevant resistance recorder to collect the longitudinal and transverse resistance values ​​of CFRP. The recorder automatically stores the resistance value at regular intervals. At regular intervals, observe the water level in the water level monitoring pipe. If the water level drops, the solution needs to be replenished.

[0124] S5. When the resistance value detection times reaches a preset requirement, the electric heating tube stops working, the solution is discharged through the drain valve, and the stress applied to the CFRP part is unloaded through the stress loading and regulating component;

[0125] After the load-environment coupling aging experiment is completed, turn off the heating program of the controller, open the water valve 5-6, drain the solution in the water circulation component, unload the prestress, take out the CFRP, cut off the solution soaked part, and conduct mechanical and physical and chemical properties tests of the composite material.

[0126] S6. Based on the data of the two-mode resistance recorder, the data of the four-mode resistance recorder and the parameters of the solution, an empirical model between resistance and the water absorption rate of the CFRP part and the mechanical properties of the CFRP part is obtained. The specific operation is:

[0127] Data analysis: By comparing and analyzing the corresponding relationship between the mechanical properties and resistance of CFRP under salt heat and humidity test conditions with different forces, an empirical model formula between resistance and CFRP water absorption and mechanical properties is established. The resistance change is correlated with the water absorption rate and mechanical property attenuation degree of the material, providing a quantitative tool for performance evaluation.

[0128] CFRP long-term service life prediction: Using the established empirical model formula, the water absorption rate and mechanical property attenuation degree of CFRP are predicted by testing the resistance.

[0129] like Figure 3 As shown in the figure, two sections of CFRP with similar or equal lengths are selected in the length direction of CFRP. The length of the left section is The left part is a non-hygroscopic section, which is isolated from water by a hydrophobic coating; the right part is The side part has no hydrophobic coating, and the water molecules and salt ions are in direct contact with the composite material, which is the hygroscopic section. The resistivity of the left part, i.e. the non-hygroscopic section, is ρ1, and the resistivity of the right part, i.e. the hygroscopic section, is ρ2. Except for the different hygroscopic conditions, the other conditions of the two sections of materials are the same. The purpose is to test whether hygroscopicity affects the resistivity or conductivity of the composite material. The conductivity of the non-hygroscopic section is G1=A / (L1 ρ1), the conductivity of the hygroscopic section is G2=A / (L2 ρ2).

[0130] The effect of water absorption on the electrical conductivity of CFRP parts is expressed as formula (1):

[0131] G water =G2-G1= L2 / ( A ρ2)- L1 / ( A ρ1);(1)

[0132] in, G wate is the change in CFRP conductivity caused by moisture absorption, G1 is the conductivity of the non-hygroscopic section, G2 is the conductivity of the hygroscopic section, A is the area of ​​the CFRP cross section, ρ1 is the resistivity of the non-hygroscopic section, ρ2 is the resistivity of the hygroscopic section, L1 is the length of the non-hygroscopic section, and L2 is the length of the hygroscopic section;

[0133] The change of the conductivity of the non-hygroscopic composite material under long-term load-environment coupling is expressed as formula (2):

[0134] G1 t =G1 t -G1 0 =L1 t / ( A ρ1t )- L1 0 / ( A ρ1 0 );(2)

[0135] in, G1 t G1 is the change in water absorption rate of the non-hygroscopic CFRP part under long-term load-environment coupling, t G1 is the electrical conductivity of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, 0 L1 is the electrical conductivity of the non-hygroscopic CFRP part during the initial load-environment coupling loading. t is the length of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, ρ1 t L1 is the resistance of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, 0 is the length of the non-hygroscopic CFRP section when the load-environment coupling loading is initially applied, ρ1 0 The resistance of the non-hygroscopic CFRP part during the initial load-environment coupling loading;

[0136] The prediction formula for the change of conductivity of the composite material in the hygroscopic section under the coupling of long-term load environment is formula (3):

[0137] G2 t =G2 t -G2 0 =L2 t / ( A ρ2 t )-L2 0 / ( A ρ2 0 );(3)

[0138] in, G2 t G2 is the change in water absorption rate of the CFRP component under long-term load-environment coupling in the moisture absorption section. t G2 is the conductivity of the CFRP component in the moisture absorption section under the long-term load-environment coupling at the service time t, 0 is the electrical conductivity of the CFRP component in the moisture absorption section when the load-environment coupling loading is initially performed, L2 t is the length of the hygroscopic section of the CFRP component under the long-term load-environment coupling at the service time t, ρ2 t is the resistance of the CFRP component in the moisture absorption section under the long-term load-environment coupling at the service time t, L2 0 is the length of the CFRP part in the moisture absorption section when the load-environment coupling loading is initially performed, ρ20 It is the resistance of the hygroscopic section CFRP component when it is initially subjected to load-environment coupling loading.

[0139] like Figure 4-5 As shown, the resistance measured by the transverse electrode at a certain position of the composite material is expressed as R x In the lateral direction of the composite material, a large number of carbon fibers and resins form a complex series-parallel resistance system. This resistance system is composed of the resistance of the fiber and the resistance of the transition layer between adjacent fibers. Assuming that the above series-parallel system is a system in which n resistors are first connected in parallel and then connected in series by m resistors, the parallel resistance of the lth row can be simply expressed as:

[0140] ;

[0141] After all m resistors are connected in series, the measured total lateral resistance can be simply expressed as:

[0142] ;

[0143] R nm is the resistance value of the mth row and nth column, R l is the resistance of row l, R x is the resistance value of the entire system.

[0144] In this system:

[0145] Stress loading control component: This module is designed to accurately stress CFRP. It can achieve constant stress or variable stress loading to simulate the stress conditions that CFRP may be subjected to in actual applications. By setting the controller program, the module can achieve automatic stress control to ensure the accuracy and repeatability of the experiment.

[0146] Water circulation component: This module provides the necessary salt, heat and humidity environment conditions for CFRP, simulating the complex environment in actual applications. Through the integrated temperature control module, the environmental conditions can be programmed and automatically controlled to ensure the stability and controllability of the experimental environment.

[0147] Radial resistance monitoring component: This module focuses on monitoring the resistance changes parallel to the CFRP fiber direction. Under the coupling of multiple factors such as force, salt, heat, and humidity, the module can capture the change process of resistance in real time and provide key data for evaluating material performance.

[0148] Transverse resistance monitoring module: Corresponding to the radial resistance monitoring module, this module is used to monitor the resistance change perpendicular to the CFRP fiber direction. By monitoring the resistance change in different directions, we can have a more comprehensive understanding of the damage and performance attenuation of the material under the coupling of multiple factors.

[0149] In this method:

[0150] (1) Installation and anchoring: CFRP is cut into a certain length, a conductive sheet or coating is attached to a specific position on the surface, a waterproof coating is sprayed on a specific part or a waterproof membrane is covered, the CFRP rod passes through the force sensor, water circulation components, etc. in sequence, and the two ends of the CFRP are mechanically clamped and anchored or bonded with anchors;

[0151] (2) Inject solution. Prepare the solution type required for the aging test. Inject the solution from the water inlet at the upper end of the water level monitoring tube until it reaches a certain height in the water level monitoring tube. Set the temperature controller's heating and cooling program and run the test.

[0152] (3) Programming and running, setting the stress level and other parameters of the stress controller, applying stress to the CFRP according to the set program, and turning on the resistance recorder to collect the longitudinal and transverse resistance values ​​of the CFRP, and automatically storing the resistance values ​​at regular intervals;

[0153] (4) Check regularly and observe the water level in the water level monitoring tube at regular intervals. If the water level drops, the solution needs to be replenished;

[0154] (5) Drain the solution. After the load-environment coupling aging experiment is completed, turn off the heating program of the controller, open the water valve, and drain the solution in the water circulation component;

[0155] (6) Unloading sampling, unloading prestress, taking out the CFRP, cutting off the solution soaked part, and conducting mechanical and physical and chemical property tests on the composite material;

[0156] (7) Data analysis: By comparing and analyzing the corresponding relationship between the mechanical properties and resistance of CFRP under salt heat and humidity test conditions with different forces, an empirical model formula between resistance and CFRP water absorption and mechanical properties is established. The resistance change is correlated with the water absorption rate and mechanical property attenuation of the material, providing a quantitative tool for performance evaluation.

[0157] (8) Prediction of the long-term service life of CFRP: using the established empirical model formula, the water absorption rate and mechanical property attenuation degree of CFRP can be predicted by testing the resistance.

[0158] The present invention aims to achieve dynamic monitoring of the material's conductivity, water absorption and damage process by real-time monitoring of the resistance change law of CFRP. The system includes a stress loading control component, a radial resistance monitoring component, a water circulation component and a transverse resistance monitoring component. Through long-term resistance monitoring, analysis of the corresponding relationship between mechanical properties and resistance, establishment of empirical model formulas and estimation of the degree of mechanical property attenuation, the present invention provides an efficient and non-destructive evaluation method for predicting the service life of CFRP, guiding maintenance and replacement strategies. The present invention achieves real-time dynamic monitoring of the conductivity, water absorption and damage process of CFRP under the coupling of multiple factors of force, salt, heat and humidity.

[0159] The present invention establishes an empirical model to provide a scientific basis for evaluating the water absorption rate and mechanical property attenuation of CFRP under the long-term multi-factor coupling. The present invention provides an efficient and non-destructive evaluation method for long-term performance monitoring of CFRP. The present invention improves the accuracy of CFRP service life prediction and provides guidance for material maintenance and replacement. This has important practical significance for predicting the service life of materials and guiding maintenance and replacement strategies. The water circulation component used in the present invention consumes less solution mass, is easy to replace and adjust, and has good experimental convenience.

[0160] The following points need to be explained:

[0161] (1) The drawings of the embodiments of the present invention only involve structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0162] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0163] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0164] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A performance resistance monitoring system for load-environment coupled loaded CFRP parts, characterized in that: include: A stress loading regulating component, on which both ends of the CFRP component are loaded, and the stress loading regulating component can perform constant stress or variable stress loading on the CFRP component, wherein the CFRP component is a CFRP plate or a CFRP rod, and the water circulation component, the radial resistance detection component and the transverse resistance monitoring component are installed on the stress loading regulating component; a water circulation component, through which the CFRP component passes, and the water circulation component is used to simulate the use environment of the CFRP component, wherein the water circulation component supports regulating the salt water concentration, temperature and humidity in the use environment of the CFRP component according to the actual environment; A radial resistance detection component, used to detect a change in resistance of the CFRP member in a first direction, wherein the first direction is parallel to a fiber direction of the CFRP member; The transverse resistance detection component is used to detect the change of the resistance value of the CFRP member in a second direction, and the second direction is perpendicular to the fiber direction of the CFRP member.

2. The performance resistance monitoring system for load environment coupled loaded CFRP parts according to claim 1 is characterized in that: The stress loading control component comprises: A mold fixing base, wherein the mold fixing base is arranged horizontally; A first mold fixing bracket and a second mold fixing bracket, wherein the first mold fixing bracket and the second mold fixing bracket are symmetrically mounted at two ends of the upper surface of the first mold fixing base; A mold driving assembly, the mold driving assembly is installed on the mold fixing base and is arranged on the mold second fixing bracket side; An anchor, one end of which is mounted on the first fixing bracket, the other end of which is mounted on the first-mold driving assembly, and both ends of the CFRP member are mounted in both ends of the anchor; A force sensor, the force sensor being mounted on the first fixed support side of the first mold and on the anchor; A first-mode controller, the first-mode controller is respectively connected to the force sensor and the first-mode drive assembly by telecommunication; Wherein, the one-mold driving assembly supports and drives the anchor on the same end side to move horizontally.

3. The performance resistance monitoring system for load environment coupled loaded CFRP parts according to claim 2 is characterized in that: The one-mode driving component comprises: A servo motor support, the servo motor support being mounted on the surface of the first mold fixed base; A servo motor, wherein the servo motor is mounted on the servo motor support; A first gear and a second gear, wherein upper and lower ends of the second gear are respectively meshed with the first gear, and the second gear is connected to the servo motor through a coupling; Screw rods, two of the screw rods are arranged in parallel, and one end of the two screw rods is respectively installed at the center of the two first gears; A support plate, wherein two threaded holes are arranged on the support plate, and the two threaded holes are respectively adapted to the two screw rods, and an end of the anchor away from the first fixed bracket of the first mold is arranged on the end side of the support plate away from the first fixed bracket of the first mold, and the CFRP part passes through the support plate and is installed on the end of the anchor away from the first fixed bracket of the first mold; When the servo motor drives the second gear to rotate, the second gear drives the two first gears to rotate, and the two first gears respectively drive the corresponding screws to rotate, the support plate moves along the horizontal direction of the screw and drives the two ends of the anchor to move closer or farther away from each other.

4. The performance resistance monitoring system for load environment coupled loading CFRP parts according to claim 3 is characterized in that: The water circulation component comprises: A target water pipe, wherein the target water pipe is arranged above the first mold fixed base, one end of the target water pipe is blocked by a first silicone plug, and the other end of the target water pipe is blocked by a third silicone plug, the CFRP component passes through the first silicone plug, the target water pipe and the third silicone plug in sequence, and the target water pipe is installed in a target water pipe insulation sleeve; An electric heating pipe, an electric heating belt is installed on the outer wall of the electric heating pipe, an electric heating belt insulation sleeve is arranged on the outer wall of the electric heating belt, the electric heating belt insulation sleeve is installed on the first fixed support of the electric heating pipe and the second fixed support of the electric heating pipe, and the first fixed support of the electric heating pipe and the second fixed support of the electric heating pipe are installed on the upper surface of the first mold fixed base; A three-mode controller, the three-mode controller is mounted on the three-mode controller support, the three-mode controller support is mounted on the upper surface of the one-mode fixed base, the three-mode controller is electrically connected to the electric heating belt and the temperature sensor, and the temperature sensor is mounted in the target water pipe; A first hose, a second hose and a third hose, one end of the first hose is connected to one end of the electric heating pipe, the other end of the first hose is connected to a circulating water pump, the other end of the circulating water pump is connected to one end of the second hose, the other end of the second hose is connected to the end side wall of one end of the target water pipe through a first tee, one end of the third hose is connected to the other end of the electric heating pipe, and the other end of the third hose is connected to the end side wall of the other end of the target water pipe through a third tee; Wherein, a first hose insulation sleeve is provided on the first hose, a second hose insulation sleeve is provided on the second hose, a third hose insulation sleeve is provided on the third hose, and the circulating water pump is electrically connected to the three-mode controller; A water level monitoring pipe, which is vertically installed above the target water pipe and connected to the target water pipe through a second tee, and a second silicone plug is provided at the end of the water level monitoring pipe; A drain valve and a water tank are provided on the electric heating pipe and on the same side as the third hose. The fourth three-way connection connects the electric heating pipe and the third hose. A drain valve is provided at the other end of the fourth three-way connection, and a water tank is provided below the drain valve.

5. The performance resistance detection system for load environment coupled loading CFRP parts according to claim 4 is characterized in that: The lateral resistance detection component: A four-mode resistance recorder, wherein the four-mode resistance recorder is mounted on the four-mode resistance recorder support, and the four-mode resistance recorder support is mounted on the one-mode fixed base; A four-mode first wire and a four-mode second wire, one end of the four-mode first wire and the four-mode second wire are respectively connected to the four-mode resistance recorder, the other end of the four-mode first wire is provided with m parallel branches, each branch of the four-mode first wire is connected to a four-mode wet transverse resistance electrode, the four-mode wet transverse resistance electrode is arranged on the CFRP part, the other end of the four-mode second wire is provided with m parallel branches, each branch of the four-mode second wire is connected to a four-mode dry transverse resistance electrode, and the four-mode dry transverse resistance electrode is provided with a CFRP part coated with a four-mode hydrophobic coating; A four-mode silicone rubber capillary sleeve is installed on the four-mode first conductor and the four-mode second conductor.

6. The performance resistance detection system for load environment coupled loading CFRP parts according to claim 5 is characterized in that: The longitudinal resistance detection component comprises: A two-mode resistance recorder, the two-mode resistance recorder is mounted on a two-mode resistance recorder support, and the two-mode resistance recorder support is mounted on the one-mode fixed base; A second-mode first wire, a second-mode second wire and a second-mode third wire, one end of the second-mode first wire is connected to the second-mode first electrode, the other end of the second-mode first wire is connected to the second-mode resistance recorder, one end of the second-mode second wire is connected to the second-mode second electrode, the other end of the second-mode second wire is connected to the second-mode resistance recorder, one end of the second-mode third wire is connected to the second-mode third electrode, the other end of the second-mode third wire is connected to the second-mode resistance recorder, Wherein, the second-mode first electrode, the second-mode second electrode and the second-mode third electrode are evenly installed on the CFRP part and in the target water pipe, the second-mode first wire, the second-mode second wire and the second-mode third wire are provided with a second-mode silicone rubber capillary sleeve; Wherein, a CFRP hydrophobic coating is provided on the CFRP member between the second-mode first electrode and the second-mode second electrode; The second-mode first electrode, the second-mode second electrode and the second-mode third electrode have the same structure.

7. The performance resistance monitoring system for load environment coupled loaded CFRP parts according to claim 6 is characterized in that: The second-mode first electrode comprises: a metal electrode, a highly conductive glue and an electrode hydrophobic coating; The metal electrode is mounted on the CFRP part through the highly conductive adhesive; The surface of the metal electrode is coated with an electrode hydrophobic coating.

8. The performance resistance monitoring system for load environment coupled loaded CFRP parts according to claim 4 is characterized in that: The electric heating belt is a glass fiber heating belt, a carbon fiber heating belt or a silicone rubber heating belt.

9. A method for monitoring the performance resistance of a CFRP component under load-environment coupling loading, characterized in that: include: Installing the CFRP component on the anchor, wherein a conductive sheet and a coating are pre-arranged on the CFRP component according to preset requirements; Adding solution from the water level monitoring pipe into the target water pipe according to preset requirements until the target height is reached, and adjusting the temperature in the target water pipe through the water circulation component; Adjust the stress on the CFRP part based on the stress loading control component; At every preset time interval, the resistance values ​​on the two-mode resistance recorder and the four-mode resistance recorder are collected and uploaded to the host computer; Wherein, the water level in the water level monitoring tube is regularly detected, and if it is lower than a preset water level, the solution is replenished; When the resistance value detection times reaches the preset requirement, the electric heating tube stops working, the solution is discharged through the drain valve, and the stress applied to the CFRP part is unloaded through the stress loading and regulating component; Based on the data of the two-mode resistance recorder, the data of the four-mode resistance recorder and the parameters of the solution, an empirical model between the resistance and the water absorption rate of the CFRP part and the mechanical properties of the CFRP part is obtained.

10. The performance resistance detection method of a load environment coupled loaded CFRP component according to claim 9, characterized in that: The empirical model between the resistance and the water absorption rate of the CFRP part and the mechanical properties of the CFRP part includes: The effect of water absorption on the electrical conductivity of CFRP parts is expressed as formula (1): G water =G2-G1= L2 / ( A ρ2) -L1 / ( A ρ1);(1) in, G wate is the change in CFRP conductivity caused by moisture absorption, G1 is the conductivity of the non-hygroscopic section, G2 is the conductivity of the hygroscopic section, A is the area of ​​the CFRP cross section, ρ1 is the resistivity of the non-hygroscopic section, ρ2 is the resistivity of the hygroscopic section, L1 is the length of the non-hygroscopic section, and L2 is the length of the hygroscopic section; The change of the conductivity of the non-hygroscopic composite material under long-term load-environment coupling is expressed as formula (2): G1 t =G1 t -G1 0 =L1 t / ( A ρ1 t )--L1 0 / ( A ρ1 0 );(2) in, G1 t G1 is the change in water absorption rate of the non-hygroscopic CFRP part under long-term load-environment coupling, t G1 is the electrical conductivity of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, 0 L1 is the electrical conductivity of the non-hygroscopic CFRP part during the initial load-environment coupling loading. t is the length of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, ρ1 t L1 is the resistance of the non-hygroscopic CFRP part under long-term load-environment coupling at service time t, 0 is the length of the non-hygroscopic CFRP section when the load-environment coupling loading is initially applied, ρ1 0 The resistance of the non-hygroscopic CFRP part during the initial load-environment coupling loading; The prediction formula for the change of conductivity of the composite material in the hygroscopic section under the coupling of long-term load environment is formula (3): G2 t =G2 t -G2 0 =L2 t / ( A ρ2 t )-L2 0 / ( A ρ2 0 );(3) in, G2 t G2 is the change in water absorption rate of the CFRP component under long-term load-environment coupling in the moisture absorption section. t G2 is the conductivity of the CFRP component in the moisture absorption section under the long-term load-environment coupling at the service time t, 0 is the electrical conductivity of the CFRP component in the moisture absorption section when the load-environment coupling loading is initially performed, L2 t is the length of the hygroscopic section of the CFRP component under the long-term load-environment coupling at the service time t, ρ2 t is the resistance of the hygroscopic section CFRP component under long-term load-environment coupling at service time t, L2 0 is the length of the hygroscopic section CFRP component when the load-environment coupling loading is initially performed, ρ2 0 It is the resistance of the CFRP component in the hygroscopic section when it is initially subjected to load-environment coupling loading.

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