723 results about "Fatigue testing" patented technology

The invention discloses a fatigue test method for a cabin structural member of an offshore wind power generator. A test piece is subjected to surface treatment, a multi-sensor array is arranged, the test piece is placed in a combined system of a multi-axis dynamic loading unit and a collaborative environment simulation cabin, an intelligent control and analysis platform synchronously applies a multi-axis alternating load, salt spray corrosion and a circulating temperature and humidity environment, and real marine service conditions are simulated; the state of a test piece is evaluated in real time based on criteria such as a strain concentration coefficient and acoustic emission energy, a strengthening test is started for potential damage risks, a load strategy is adjusted to track crack propagation when microcracks are monitored, and after the test is ended, a fatigue life prediction model is established or calibrated by combining failure test piece analysis data. And outputting a life evaluation result and a structure improvement suggestion. Through the multi-factor collaborative simulation and self-adaptive control technology, the authenticity and efficiency of the test are improved, and technical support is provided for design optimization and reliability guarantee of offshore wind power cabin structural parts.

The invention belongs to the technical field of fatigue testing, and discloses a testing machine phase difference optimization method and system and a rubber product fatigue testing machine. The method comprises the steps of presetting a loading path signal, collecting sensor data, and performing feature extraction on the sensor data to obtain phase difference features; taking the parameters of the test piece and the phase difference characteristics as input of a dual-channel lightweight model, and obtaining a phase difference predicted value of each channel; based on a multi-target dynamic parameter optimization algorithm, control parameters of the test machine are optimized and adjusted in combination with the phase difference predicted value and the inter-channel coupling characteristics; the strain distribution of the test piece is monitored in real time, and when the strain unevenness is larger than a preset strain threshold value, channel load redistribution is triggered, and the phase difference is optimized again; according to the invention, test piece characteristics and loading path changes can be sensed in real time, the phase difference prediction error is reduced, the test efficiency is improved, the energy consumption is reduced, and the authenticity of multi-axis load simulation, the phase control precision and the comprehensive performance of the system are remarkably improved.

The invention provides a fretting fatigue testing device and method in an atmosphere environment, and relates to the technical field of material performance testing in a complex environment, and the device comprises an upper clamp, a lower clamp and a sealing cavity; the upper clamp and the lower clamp are respectively fixed in an upper chuck and a lower chuck of the first load loading mechanism; the sealing cavity is used for providing a sealed service atmosphere environment for a fatigue specimen and comprises two flange end covers and a tubular connecting piece, the two flange end covers are respectively connected with the upper clamp and the lower clamp in a sealing manner; the two ends of the tubular connecting piece are in sealing connection with the upper end cover and the lower end cover respectively, and sealing connection of at least one end is of a detachable structure. The device can realize accurate simulation and steady state maintenance of service gas, is suitable for multiple scenes such as dry / wet air, inertia, oxygen / hydrogen enrichment and corrosive gas, and overcomes the limitation that traditional atmospheric environment test data cannot be used for real life prediction.

The invention discloses a two-degree-of-freedom clamp capable of adjusting the bending moment and direction of a turbine blade and a test method. The two-degree-of-freedom clamp comprises a blade clamping component, an upper adjustable U-shaped head, a lower adjustable U-shaped head, an upper clamping rod and a lower clamping rod. The blade clamping component is in threaded connection with the upper adjustable U-shaped head and the lower adjustable U-shaped head, the other end of the upper adjustable U-shaped head and the other end of the lower adjustable U-shaped head are connected with the upper clamping rod and the lower clamping rod respectively, and the other end of the upper clamping rod and the other end of the lower clamping rod are connected with an upper clamping head and a lower clamping head of the fatigue testing machine respectively. The upper clamping rod and the upper adjustable U-shaped head are adjustably connected in pairs in the transverse direction intersecting with the vertical axis so as to adjust the eccentricity of the turbine blade load. The eccentric angle of the blade load can be adjusted by adjusting the rotation cycle of the blade clamping component. According to the clamp disclosed by the invention, by adjusting the eccentricity and the eccentricity angle during a turbine blade test, different bending moment directions and relative sizes of different sections during the turbine blade test can be realized, so that the aim of simulating a real load is fulfilled.

The invention discloses a device for a bending-torsion coupling fatigue test. The device comprises a frame, a test piece end fixing mechanism and a test piece force applying mechanism. Wherein the frame forms a square frame body structure. The test piece end fixing mechanism is mounted on the inner side of the frame and used for clamping one end of the test piece. The test piece force application mechanism and the test piece end fixing mechanism are transversely arranged in the frame at an interval, and the test piece force application mechanism comprises a lifting mechanism fixed on two opposite inner walls of the frame, a bending and twisting force application mechanism connected with the lifting mechanism, and a twisting force application driving mechanism in transmission fit with the bending and twisting force application mechanism and connected to the frame; the bending and twisting force applying mechanism and the test piece end fixing mechanism are transversely and oppositely arranged and are used for clamping and fixing the other end of the test piece. Under the condition that a traditional uniaxial fatigue testing machine is not modified, the upper and lower uniaxial loads of the fatigue testing machine can be converted into the bending-torsion multi-axial combined load of the test piece, accurate bending-torsion torques can be obtained, and effective data support is provided for a fatigue test.

The invention belongs to the technical field of testing equipment, and particularly relates to a multipurpose high-frequency fatigue testing machine which comprises main control equipment and a fatigue testing machine body, the fatigue testing machine body comprises a bottom machine and an electromagnetic high-frequency generating machine body, and a balance weight table is assembled under the electromagnetic high-frequency generating machine body through connecting rod connection; clamp assemblies are assembled on the surface of the bottom machine and the lower surface of the counterweight table; the multiple balance weights are adjustably stacked on the surface of the balance weight table and used for being matched with the resonance points by replacing balance weights; and the plate clamp is detachably assembled with the clamp assembly and is used for detecting cracks generated in the test process of the test sample. The device can replace manpower to flexibly adjust the counterweight, realizes rapid and convenient operation, can timely detect a cracked plate in a test, and is convenient to timely stop the test before the sample is fractured.

The invention relates to a bending-torsion coupling transmission shaft fatigue test device and method, and relates to the technical field of test equipment. Comprising a test bench, a bending loading device arranged at one end of the test bench, a torque loading device arranged at the other end of the test bench, and a test piece bearing device arranged between the bending loading device and the torque loading device, the test piece bearing device comprises a guide rail which is arranged on the test bed and extends from the bending loading device to the torque loading device, a positioning seat which is in sliding connection with the guide rail, and a bearing plate which is arranged on the positioning seat and can be lifted, so that a simulation test of a coupling effect can be carried out on bending and torsion of a transmission shaft, and the test piece bearing device can also be used for bearing the transmission shaft. And the bending test can be carried out under the condition that the transmission shaft is supported at a specific position.

The invention provides a metal plate bending fatigue testing device, and relates to the technical field of bending fatigue testing assistion.The metal plate bending fatigue testing device comprises a portal frame, a testing device support, a testing pressure applying assembly and two bearing assemblies, and the testing pressure applying assembly comprises a hydraulic push rod, a T-shaped plate, a rotating air cylinder, an adjustable pressure applying piece and a roller assembly; the two bearing assemblies each comprise a supporting round rod, a transverse rod base and a vertical plate base, two round rollers are arranged between the two supporting round rods, and ratchet wheel assemblies are arranged at the two ends of the two round rollers; according to the technical scheme, a T-shaped plate is controlled by a hydraulic push rod to drive an adjustable pressure applying piece and a roller assembly to move towards the bottom, and a rotary air cylinder drives the adjustable pressure applying piece to drive the roller assembly to rotate, so that a sample plate is supported by a supporting round rod and a round roller, and the roller assembly applies pressure when rolling at the center of the top of the sample plate; the effect of expanding the bending angle of the sample plate is achieved, and the basic requirement for simulating the working state is provided for data acquisition in the subsequent sample plate fatigue test.

The automobile part torsional fatigue test bench comprises a bench body, a driving mechanism is arranged at one end of the top surface of the bench body, a workpiece carrying structure is arranged at the other end of the top surface of the bench body, a force application structure is arranged at the position, close to the driving mechanism, of the top surface of the bench body, and the driving mechanism comprises a driving bin. The end, away from the force application structure, of the driving bin is fixedly connected with a servo motor, and the two sides of the middle of the interior of the driving bin are fixedly provided with a cycloidal-pin wheel speed reduction assembly and a planetary speed reduction assembly correspondingly. The driving mechanism is driven by the servo motor, a huge oil supply hydraulic system does not need to be used, the occupied area is small, the output torsion load can be switched through the cycloidal-pin wheel speed reduction assembly or the planetary speed reduction assembly, the load output through the planetary speed reduction assembly is low, constant loads can be repeatedly applied to a workpiece for a long time, and the working efficiency is improved. The output load of the cycloidal-pin wheel speed reduction assembly is high, destructive testing of the maximum load can be carried out, and two detection modes can be considered.

The invention relates to a synchronous loading and self-adaptive compensation system for a fatigue test and a working method thereof.The synchronous loading and self-adaptive compensation system for the fatigue test is characterized in that the synchronous loading and self-adaptive compensation system comprises a T-shaped beam capable of being connected with a fatigue testing machine, the two lower side portions of the T-shaped beam are connected with pentagonal steel plates respectively, and the pentagonal steel plates are connected with the T-shaped beam. A plurality of groups of loading units are mounted between the two pentagonal steel plates, each loading unit comprises a hard shell and a rotating disc rotationally connected with the hard shell, a driving mechanism for driving the rotating disc to swing and rotate is arranged on the hard shell, a spherical hinge is fixedly mounted on the rotating disc, and the rotating disc is fixedly connected with the driving mechanism. The lower part of the spherical hinge is connected with an electric telescopic rod which can be electrically controlled to stretch out and draw back, and the lower end of the electric telescopic rod is provided with a loading block acting on the test piece; the problems of'void impact 'and'loading eccentricity' are fundamentally solved, and efficient, accurate and safe multi-test-piece synchronous fatigue test is realized.

The utility model discloses a transmission shaft torsional fatigue testing machine, which relates to the technical field of transmission shaft testing and comprises a workbench, a torsion component arranged on one side of the top surface of the workbench, a slide rail component arranged on the other side of the top surface of the workbench, and an angle adjusting mechanism arranged on the top surface of the slide rail component. A supporting component is arranged between the sliding rail assembly and the angle adjusting mechanism, the supporting component is arranged on the top face of the workbench, and a protection assembly is arranged above the workbench. In the using process of the device, the transmission shaft can be stably clamped, and accurate torsion testing can be achieved; the structure of the testing machine is optimized, and stability and reliability are improved; wear-resistant materials and structural reinforcement design are adopted, vulnerable parts are reduced, the service life is prolonged, a comprehensive and reliable basic database can be established through a fatigue life test, analysis design reliability is provided, development time is shortened, development cost is reduced, and the problems of product life reliability and bearing capacity are solved.

The invention relates to the technical field of fatigue detection, and discloses a microcomputer-controlled fatigue test device which comprises a workbench, a turntable and a limiting mechanism are installed on the workbench, the turntable is driven to rotate, the limiting mechanism is fixedly connected to the workbench and located in a hole in the center of the turntable, and a swing mechanism is installed on the turntable. The swing mechanism is installed at the eccentric position of the rotating disc, a first installation block capable of swinging is arranged on the swing mechanism, the first installation block extends to the position over the limiting mechanism, one end of a cable to be detected is installed on the first installation block, and the other end of the cable to be detected is installed on the limiting mechanism; through cooperation of the swing mechanism and the rotating disc, the cable is initially vertically arranged, and the swing mechanism and the rotating disc can drive the vertically arranged cable to carry out torsion test, bending test and bending and torsion superposition test, so that the detection of the cable can better fit the use environment of the cable; and the accuracy of data testing is improved.

The utility model provides a tooling device for a fatigue test of a plate, which is applied to the fatigue test of a bridge deck slab and relates to the technical field of the fatigue test of the plate, the tooling device comprises a first connecting piece, a first supporting piece and a second supporting piece, the first connecting piece comprises a sliding part, a connecting part and a rolling bearing, one end of the sliding part is connected with one end of the connecting part, and the other end of the connecting part is connected with the rolling bearing; rolling bearings are symmetrically arranged on the two sides of the other end of the sliding part, the first supporting piece comprises a first supporting plate, one end of the first supporting plate is vertically fixed to the test platform, an opening is formed in the other end of the first supporting plate, and the other end of the connecting part penetrates through the opening and is connected with one end of a panel; rolling grooves corresponding to the rolling bearings are formed in the sides, away from the panel, of the first supporting plates, the rolling grooves extend vertically, the rolling bearings abut against the rolling grooves and are used for rolling along the rolling grooves, and the second supporting pieces are fixed to the test platform and used for fixing the stiffening ribs. The bridge deck slab fatigue testing device is simple in structure and low in cost, and can reasonably reflect the actual fatigue condition of the bridge deck slab.

The invention belongs to the technical field of impact fatigue tests of metal materials, and relates to an impact fatigue test system for simulating a working condition environment of a gun firing pin, which can perform high-frequency cyclic loading of 200MPa-500MPa, microsecond (mu s) level impact pulse and more than kilohertz (kHz), and synchronously simulate the working condition environment. High-energy, high-frequency and short-pulse impact loading under the gun and gun firing pin working condition is carried out through the high-frequency impact generation subsystem, and the dynamic mechanical environment in actual service is effectively simulated; the environment simulation subsystem is used for accurately controlling the temperature, the concentration and the pH value of media such as salt mist and seawater, and is synchronously coupled with mechanical shock, so that mechanical-electrochemical synergistic damage conditions are truly represented; dynamic stress, strain, electrochemical parameters and surface topography in the impact process are synchronously monitored through a multi-parameter synchronous acquisition subsystem, and complete data support is provided for researching the damage evolution law of a material under a complex load; the repeatability and the safety of the test are ensured through the modularized sample clamp subsystem and the dynamic sealing design.

The invention discloses a high-temperature fatigue testing machine self-compensation clamp based on a temperature compensation algorithm and a control method thereof, and relates to the technical field of high-temperature fatigue testing machines, a temperature sensor and a force sensor are adopted to collect intelligent sensing data, and the control method is high in compensation precision and wide in application range. An original thermal expansion-creep-rigidity temperature drift-gradient learning four-in-one temperature compensation algorithm is adopted, the nonlinear effects of thermal expansion, high-temperature creep and system rigidity changing along with temperature are comprehensively considered, the error source of the whole temperature range can be covered, the strict requirement for verifying the fatigue life under the extreme working condition is met, and the fatigue life is verified. Through a'temperature-clamping force 'closed-loop control algorithm and a unique feedforward-feedback displacement compensation mechanism of a PID controller, the clamping force is dynamically and accurately adjusted.

The invention discloses a multi-field coupling fatigue test device and method for a high-temperature superconducting tape, and belongs to the field of superconducting tape fatigue tests.The multi-field coupling fatigue test device for the high-temperature superconducting tape comprises a fatigue testing machine, and a test container used for providing a low-temperature field is arranged in a test area of the fatigue testing machine; a clamp assembly used for fixing a sample to be tested is arranged in the experiment container, the clamp assembly is connected with a current assembly used for providing an electric field, and a magnet assembly used for providing a magnetic field is arranged in the experiment container. According to the multi-field coupling fatigue test device and method for the high-temperature superconducting strip, the limitation of an existing test means is broken through, and a reliable experimental platform and application value are provided for mechanical property research and service life evaluation of superconducting materials and other low-temperature service materials.

The invention provides an improved Arcan disc complex stress metal fatigue test method. The method specifically comprises the following steps: (1) designing clamps for stretching, stretching-shearing and pure shearing fatigue tests; (2) designing a clamp for compression, compression-shear and pure shear fatigue tests; (3) designing a stretching-shearing or compression-shearing sample, and connecting the clamps designed in the step (1) and the step (2) to a clamping rod and a pin required by a fatigue testing machine; and (4) assembling the clamps designed in the step (1) and the step (2) and the sample designed in the step (3), and connecting to a fatigue testing machine by using a clamping rod and a pin. The metal fatigue performance test under different stress states such as stretching / compression, stretching-shearing / compression-shearing, pure shearing and the like can be realized, the fatigue test result difference caused by different stress states can be quantified, optical and high-resolution scanning electron microscope observation under in-situ conditions can be compatible, and the fatigue failure mechanism analysis is facilitated.

The invention provides a clamping device for a thin-wall whole pipe fatigue test and a test method, and belongs to the technical field of clamping devices. The device comprises clamping cushion blocks which are fixedly connected to two ends of a thin-wall whole tube sample main body and are used for transmitting test force; the high polymer material film adhesive tape is wound on a transition area of the clamping cushion block and the thin-wall whole pipe sample main body; the chock plugs are used for being plugged into the two ends of the thin-wall whole-tube sample main body, and packing paper is installed between the chock plugs and the inner wall of the thin-wall whole-tube sample main body and used for supporting the inner wall of the sample and evenly transmitting test force. The clamping cushion blocks are fixedly connected to the two ends of the sample and matched with the high polymer material film adhesive tape to reduce friction, the chock plugs are wound around the packing paper to support the inner wall, a stable clamping structure is formed, and it is ensured that fatigue fracture occurs in the working section. The problems of clamping stress concentration and fracture of a non-working section can be effectively avoided, the accuracy of a fatigue life evaluation result of the whole thin-wall pipe is improved, and the method can be widely applied to high-cycle and low-cycle fatigue performance tests under different conditions.

The corrugated pipe fatigue testing machine comprises a base, a first rotating assembly and a deflection movement assembly, the first rotating assembly comprises a first motor, a first rotating shaft and a first tool, and the first tool is arranged at one end of the first rotating shaft and used for installing a corrugated pipe; the other end of the first rotating shaft is connected with the output end of the first motor; the deflection movement assembly comprises a deflection base, a slewing bearing and a deflection motor, the slewing bearing is arranged on the base, the deflection base is arranged on the slewing bearing and connected with the output end of the deflection motor, a second tool is arranged on the deflection base, and the second tool is rotationally connected with the deflection base and used for being matched with the first tool to fixedly install the corrugated pipe; under driving of the first motor, the first rotating shaft drives the corrugated pipe to axially rotate, and under driving of the deflection motor, the deflection base drives the corrugated pipe to deflect along the axis of the slewing bearing.

The invention discloses a spring fatigue test device, which belongs to the technical field of mechanical test equipment and comprises a rack, a data acquisition module, an environment simulation integrated cabin, a multi-axis loading module and a micro-motion simulation base. The rack provides a supporting and mounting space for the whole device. Through cooperative work of the main loading unit, the first auxiliary loading unit and the second auxiliary loading unit, axial loads, torsion loads and lateral loads can be applied to the spring at the same time or according to a preset phase relation in a test period, and the tension-compression-torsion-bending composite stress state of the spring under the actual working condition is accurately reproduced. Compared with a traditional uniaxial test, the result is closer to engineering practice, and the authenticity and the severity of the test are greatly improved.

The invention relates to the technical field of pavement material mechanical property testing, and discloses a pavement material deformation adaptability fatigue testing machine, which comprises a servo drive and control system, a mechanical transmission system and a structure support and reference system, the servo drive and control system comprises a servo motor, a PLC, a servo driver and an analog quantity output module, the PLC is electrically connected with the analog quantity output module, the analog quantity output module is electrically connected with the servo driver, and the servo driver is electrically connected with the servo motor. The load coverage range is wide, the test requirements of pavement material test pieces with different strengths are met, the requirements of various mechanical property tests on loads are met, the loading modes are flexible and diversified, single loading such as horizontal stretching, stretching containing vertical deformation and fatigue stretching circulation can be achieved, and the test efficiency is improved. The device can be combined with MMLS3 small acceleration loading equipment to realize composite loading of tire cyclic load and test piece deformation, and composite working conditions of the seamless expansion joint in actual service are accurately simulated.

The utility model provides a cold-drawing hot-pressing fatigue testing machine for a sealing material, which relates to the technical field of fatigue testing machines and comprises a test supporting seat, a pressure detection plate for pressure detection is fixedly mounted in the test supporting seat, and a negative pressure component for sucking the material is arranged in the middle of the test supporting seat. And a lifting support for lifting adjustment is fixedly mounted at the top end of the test supporting seat. The testing machine has the advantages that the rotatable test supporting seat is arranged in the testing machine to clamp and fix a tested material, the negative pressure assembly is arranged in the center of the test supporting seat to perform negative pressure adsorption on the tested material, and the test materials with various structures can be conveniently clamped and fixed by combining with the clamping of the test supporting seat; according to the material fixing device, material loosening caused by the limited clamping contact area is avoided, the stability of test material fixing can be effectively enhanced, the applicability of material fixing can be improved, and fixing tests can be conducted on unused materials easily.

The invention belongs to the technical field of metal plate processing and testing, and particularly discloses a device and method for testing the bending forming capacity of a metal composite plate. The device comprises a test base, a movable heating mechanism which slides and can be locked on the test base, a bending test mechanism rotationally connected to the test base, a fixed hydraulic mechanism, a first driving motor and a second driving motor, a heating element is arranged in the movable heating mechanism, so that the plates can be uniformly heated on line; the bending test mechanism controls the clamping force and the bending angle of the bearing through a servo motor in a closed-loop manner, and collects pressure and angular displacement data in real time; and the hydraulic telescopic head of the fixed hydraulic mechanism executes reverse pushing after single bending, so that a fatigue cycle test is realized. According to the invention, normal-temperature / thermal-state multi-angle bending and fatigue testing can be carried out on metal composite plates with different specifications, the forming limit and layering failure critical parameters are rapidly obtained, and the process optimization efficiency and the product reliability are improved.

The invention relates to the field of material detection, in particular to an in-situ monitoring method for fatigue damage of a cord thread / rubber composite material interface. The method comprises the following steps: carrying out ultrasonic swelling treatment on a cord thread coated with an RFL coating by using a carbon nanotube dispersion liquid, and then preparing an H extraction sample with rubber; and then connecting a circuit, fixing the obtained H extraction sample on an electronic fatigue testing machine, forming a closed loop circuit between the H extraction sample and the source meter, carrying out fatigue testing and measuring contact resistance, and carrying out resistance signal processing to obtain a resistance change rate deltaR / R0. The method provided by the invention is efficient and convenient, and the interface fatigue damage of the cord thread / rubber composite material can be visually and effectively monitored.

The invention discloses a friction, corrosion and alternating load coupled fatigue test tool which mainly comprises a corrosive liquid container, a moving module, a balancing module, a supporting module, a friction loading module and a fixing module, and the whole tool is mounted on a sample clamp of a fatigue testing machine. According to the test tool, a corrosion environment is provided by the corrosive liquid container, a friction load is provided by the friction loading module, an alternating tensile load is provided by the fatigue testing machine, and the coupling effect of friction, corrosion and alternating load on the annular tensile armor layer of the marine flexible riser in a real marine environment can be simulated; and tests under various different working conditions can be realized by changing the components of the corrosive liquid, changing the friction force, changing the material of the friction block and the like, and the damage process of the tensile armor layer in a real ocean service environment can be reproduced, so that the influence of a real friction, corrosion and alternating load coupling environment on the annular tensile armor layer of the ocean flexible riser can be researched.

The invention relates to the technical field of mechanical fatigue testing, in particular to rotary bending fatigue testing equipment for a rotor shaft, which comprises a base, a rotary driving module, a loading module, a dynamic balance module, a crack monitoring module and an adjusting module, and is characterized in that the rotary driving module drives the rotor shaft to rotate through a belt transmission assembly; the loading module adopts a lever type force reversing mechanism to realize accurate bending moment loading; the dynamic balance module automatically counteracts eccentric vibration through a free disc and a symmetrical bearing seat; the crack monitoring module captures vibration abnormity and internal crack initiation in real time; and the adjusting module is automatically adapted to different shaft lengths by driving a threaded screw rod through a motor. Anti-slip lines are arranged on the inner sides of the clamps at the two ends to ensure stable clamping; the levers are symmetrically arranged and matched with the locking nuts, so that switching of translation force or bending force applied by the levers is facilitated, the equipment realizes high-precision and full-period fatigue test, and the device is suitable for reliability evaluation of key rotor parts of aero-engines and steam turbines.

The invention relates to the technical field of detection devices, and discloses a graphene thermal insulation material pressure test detection device which comprises a rack, a liquid detection station, a collection station, a temperature change detection station and a fatigue test station are sequentially arranged on the rack in the clockwise direction, and a liftable detection frame and a movable carrying table are installed on the rack. A directional guide system, a pressure control system driven by a first air pump and a rotatable rotating station frame are mounted on the detection frame, a group of mounting parts are mounted on the rotating station frame, each mounting part comprises a joint vibration assembly, a vibration frame capable of reciprocating up and down and a rotatable hanging shaft are mounted on the joint vibration assembly in a transmission manner, and the hanging shaft is rotatably mounted on the vibration frame. The bottom end of the hanging shaft is clamped and magnetically attracted with a hanging frame, and a detection box is installed on the hanging frame. According to the device and the method, the performances of corrosion resistance, temperature change resistance, fatigue resistance, microstructure, surface performance and the like of the graphene thermal insulation material can be detected on the same device.

This invention discloses a rapid assessment method for hydrogen damage in ultra-long-life structures under alternating loads, relating to the field of materials performance evaluation. The method includes the following steps: S1: Analyzing the service conditions of typical ultra-long-life structures and key components to determine the service environment of key component materials; S2: Conducting ultra-high cycle fatigue tests under different stress ratios to obtain stress-life data for different lifespans; S3: Observing the fracture morphology of high-cycle fatigue and ultra-high cycle fatigue samples using scanning electron microscopy; S4: Performing hydrogen element detection to obtain the hydrogen content distribution around micro-defects; S5: Using the Basquin formula, piecewise linearly fitting the S-N data for the high-cycle fatigue and ultra-high cycle fatigue stages to obtain the slopes of two fitted lines; S6: Using the ratio of the slopes of the two fitted lines as the hydrogen damage factor. The method disclosed in this invention can achieve rapid assessment of hydrogen damage in long-life structures under alternating loads while ensuring the reliability of the assessment results.

The invention provides a parallel steel wire corrosion fatigue test device, and relates to the technical field of steel wire physical tests, the parallel steel wire corrosion fatigue test device comprises a closed cylinder, two ends of the closed cylinder are provided with openings for a test steel wire to penetrate, and the two ends of the test steel wire penetrate out of the closed cylinder and then are respectively clamped and fixed with an upper chuck and a lower chuck of a fatigue testing machine; the inner pipe is arranged in the closed cylinder, the test steel wire penetrates through the inner pipe in the axial direction, and the inner pipe is provided with a plurality of cracks with different sizes and / or different forms in the axial direction; the bag body is arranged on the inner wall of the inner pipe, the bag body has a first state and a second state which can be switched, and the aerial fog assembly communicates with the closed cylinder and is used for introducing corrosive aerial fog into the closed cylinder. And a corrosion medium and a fatigue load are synchronously applied to the local area to realize a real-time coupling effect of the corrosion medium and the fatigue load, so that corrosion fatigue test data with higher engineering authenticity and representativeness are obtained.

The invention relates to the technical field of online material performance test instruments, and discloses a sensor pulse pressure fatigue test closed-loop control system based on signal drift compensation, which comprises a load excitation execution module, a signal feedback acquisition module and a closed-loop control logic module, the closed-loop control logic module selects a phase-locked characteristic observation window by calculating a load first-order derivative, extracts a dynamic gain coefficient reflecting the response characteristic of a controlled test object in the observation window, and inputs the dynamic gain coefficient into a filter to generate a characteristic variable; the variable is compared with the standard response envelope line, the deviation is calculated, the compensation factor is calculated and superposed to the driving instruction, the real-time correction of the output gain is realized, and through the identification and active compensation of the signal drift, the sensing deviation caused by the structural degradation of the sensitive component is effectively eliminated, and the sensing consistency of the test process is maintained.