1056 results about "Fatigue testing" patented technology

The invention discloses a fatigue testing device and method for an implant and an abutment, and belongs to the field of dental implant testing. Fatigue test equipment for an implant and an abutment comprises a test box, piston boxes are fixedly connected to the two sides of the top of the test box, an arc-shaped plate is fixedly connected between the piston boxes on the two sides, the fatigue test equipment further comprises a detection seat, the detection seat is installed on the top of the arc-shaped plate, and a positioning groove is formed in the detection seat; according to the invention, the swing arm rod drives the detection seat to swing back and forth, and the impact plate, the piston plate, the first spring and the second spring are arranged to generate various horizontal and vertical acting forces on the combination of the implant and the abutment, so that various different chewing actions and force changes are effectively simulated, the test is closer to the actual situation, and the test efficiency is improved. Therefore, the fatigue performance of the combination of the implant and the abutment in a long-time use period can be evaluated, and the representativeness and the accuracy of a fatigue test result are effectively improved.

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 relates to a fatigue test device and method for an energy storage spring, and the method comprises the following steps: 1, taking the energy storage spring in a to-be-tested high-voltage circuit breaker, measuring the parameters of the energy storage spring, and carrying out the preliminary machining; 2, the energy storage spring obtained after primary machining is installed on a fatigue test device; 3, statically and statically loading the energy storage spring to the compression height H1 on the fatigue test device; 4, initial stress measurement and fatigue test of the energy storage spring are carried out, and test data are obtained; and 5, processing the obtained experimental data to obtain an experimental result. The method comprises the following steps: firstly, performing two-stage compression on a spring to H1 by performing staged static loading, then adjusting the compressed spring and a compression device to a starting point of a maximum compression stroke of a fatigue testing machine, and reserving enough compression displacement space for large-stroke compression fatigue.

The invention discloses a method and device for testing the fatigue crack growth rate of a metal material based on temperature gradient change, and relates to the technical field of metal material detection. Mounting a constant low-temperature component and a constant high-temperature component close to two ends of the sample respectively; pasting a plurality of thermocouples on the middle surface of the sample; a magnetic powder dynamic moving assembly is installed on the surface of the sample, and a constant-temperature state is given to magnetic powder; loading a bidirectional tension-compression fatigue testing machine along the through hole of the sample; a thermal imager is arranged far away from the parallel sample, and a thermal imaging image is shot; according to the data, the fatigue crack growth rate of the sample at the corresponding temperature is obtained; according to the method, the fatigue crack growth rate of the metal material can be rapidly tested, meanwhile, the temperature gradient is formed in the sample, the influence of the temperature on the crack growth rate can be obtained in different temperature areas, the device required by the whole test is simple in structure, low in cost and convenient to load and disassemble, and the whole efficiency of the test is effectively improved.

The invention provides a fatigue test method, system and equipment based on texture change of carbon fibers and a medium, and belongs to the technical field of material tests.The method comprises the steps that a carbon fiber composite material is selected as a test sample; applying a fatigue load to the test sample according to a designed test condition, and collecting a surface image of the test sample; the method comprises the following steps of: preprocessing an acquired image, clustering according to the gray level and texture similarity of pixels to obtain a plurality of clustering subareas, and marking different clustering areas by using different colors to complete color mapping; extracting texture feature parameters from the image after color mapping, and performing PCA dimension reduction to obtain key texture feature parameters; and comparing the key texture feature parameters of the image under different test conditions, identifying texture feature changes, and completing fatigue performance evaluation. According to the method, image processing and texture feature analysis are combined, so that non-destructive testing of the CFRP fatigue performance is realized, and the testing accuracy and efficiency are improved.

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 utility model provides a platy sample fixture for stress corrosion fatigue test, which comprises an upper chuck, a lower chuck, a corrosion container and a plurality of locking bolts, the upper end of the upper chuck is provided with a fatigue testing machine fixing part, and the lower end of the upper chuck is provided with a platy sample slot with a downward opening; an upper threaded hole communicated with the plate-shaped sample inserting groove is formed in the side wall of the upper chuck, the locking bolt is in threaded connection with the upper threaded hole, the plate-shaped sample inserting groove with an upward opening is formed in the upper end of the lower chuck, a lower chuck connecting hole is formed in the bottom of the corrosion container, and the lower chuck connecting hole is in threaded connection with the outer side wall of the lower chuck. And a lower threaded hole communicated with the plate-shaped sample slot is formed in the side wall of the lower chuck. By adopting the high-strength corrosion-resistant alloy and the acrylic solution pool, the plate-shaped sample clamp for the stress corrosion fatigue test has excellent corrosion resistance and mechanical strength, the stability of a sample in a corrosive medium is ensured, so that the accuracy and the reliability of a test result are improved, meanwhile, a lower chuck connecting hole is in threaded connection with the outer side wall of the lower chuck, and the stability of the test result is improved. And the corrosive liquid is prevented from leaking.

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 discloses a pressure switch fatigue test system and method based on data analysis, and relates to the field of switch pressure test. The method comprises the following steps: S1, constructing an instantaneous pressure regulation factor based on a preset target pressure value and a current pressure deviation, and superposing external disturbance compensation to generate a real-time pressure signal; s2, based on the real-time pressure signal, an analog current signal is generated through nonlinear coupling, the dynamic proportion of the pressure to the current change rate is synchronously adjusted, and the corrected current change rate is output; s3, comparing the real-time pressure signal with a preset pressure threshold value, judging the on-off state of the switch, and performing cumulative statistics on the on-off times of the switch; s4, based on the real-time pressure and current signals, fatigue damage is dynamically evaluated through a stress-strain feedback model, and the switch fatigue degree is calculated in an accumulated mode to generate an accumulated fatigue damage strength index. Through fusion of dynamic regulation and control, current synchronization and a damage integration mechanism, working conditions are accurately simulated, nonlinear damage is quantified, and test authenticity and life reliability are improved.

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 utility model discloses a fatigue testing machine for an automobile tire steel cord. The fatigue testing machine comprises a rack, and a controller, a front winding clamp, a middle winding clamp, a rear winding clamp, a motor eccentric wheel mechanism, a force application mechanism and a broken wire sensing device which are arranged on the rack, the front winding clamp, the middle winding clamp and the rear winding clamp are used for clamping and fixing a to-be-tested steel cord; the motor eccentric wheel mechanism can drive the middle winding clamp to move left and right in a reciprocating mode, and the motor eccentric wheel mechanism is electrically connected to the controller; the force applying mechanism is used for applying gravity to the steel cord to be tested; the broken wire sensing device is used for judging whether the to-be-detected steel cord is broken or not in the detection process; the broken wire sensing device is electrically connected to the controller; a motor eccentric wheel mechanism is matched to drive the middle winding clamp to reciprocate left and right to simulate repeated bending of the steel wire; therefore, repeated bending tests can be carried out on the steel cords with different specifications under the condition that the steel cords bear the tensile force.

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 invention relates to the technical field of fatigue testing, and discloses a blade multi-degree-of-freedom traction loading device and a fatigue testing method.The blade multi-degree-of-freedom traction loading device comprises a rail supporting structure, a blade base structure, a blade clamp and a multi-direction loading assembly, and the blade base structure bears and fixes the root of a tested blade; the blade clamp is fixed with the blade; the multidirectional loading assembly comprises a track and at least one traction actuator, and the track is fixed on the track supporting structure; the traction actuator is arranged on the track, and the traction actuator is configured to be capable of moving along the track; the traction actuator comprises a track displacement driving mechanism and a traction mechanism; the traction actuator is configured to move on the track through the track displacement driving mechanism; the traction mechanism is connected with the blade clamp, and the traction mechanism is configured to apply an adjustable traction force to the to-be-tested blade. The traction direction is adjusted by pulling the actuator to move to different positions along the track, and different traction forces are applied in cooperation with the traction mechanism, so that multiple loading modes are 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 invention belongs to the field of mechanical testing equipment, and particularly relates to a bicycle pedal assembly crank dynamic fatigue testing device which comprises a base, the base is a bearing carrier of the testing device, and supports are symmetrically and fixedly connected to the two sides of the base; the device further comprises a mounting block fixedly connected to the top of the support, motors are fixedly mounted on the mounting block, output shafts of the motors on the two sides face the opposite sides and are fixedly connected with mounting shafts, and driving discs are assembled at the ends of the mounting shafts. The two shaft arms of the bicycle crank are clamped and rotated through the driving disc driven by the motor, the dynamic motion state in the actual riding process can be simulated, the resistance generated by parts such as a chain to the crank is simulated through cooperation with the magnetic field effect between the electromagnetic block and the magnetic resistance piece, the resistance can be adjusted by changing the power-on strength of the electromagnetic block, and the stability of the bicycle crank is improved. Therefore, different conditions in actual use can be simulated more accurately.

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 relates to the technical field of fatigue testing, and discloses a blade fatigue testing device and method based on a vortex-induced vibration principle, the blade fatigue testing device based on the vortex-induced vibration principle comprises a test bench foundation and at least one excitation unit, the test bench foundation is suitable for fixing a blade root of a tested blade; the excitation unit comprises a blade cover body and a pneumatic loading module, the blade cover body is of an annular structure fixedly arranged on the periphery of a test blade in a sleeving mode, the pneumatic loading module is arranged below the blade cover body, and the pneumatic loading module comprises a frame and at least one air blowing piece installed on the frame; wherein the air blowing piece is configured to blow air to the blade cover body, and turbulent flow is formed at the blade cover body. Non-contact excitation is achieved through aerodynamic coupling, the additional mass influence caused by mechanical connection is avoided, and full-size fatigue verification of the blade is completed under the condition that the natural vibration characteristic is kept.

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 thermal fatigue testing device for a turbine guide vane. The thermal fatigue testing device comprises a base; the heating module comprises a profiling wire of which the shape is matched with the cross section of the to-be-tested piece and a power supply for driving the profiling wire to generate an induction heating magnetic field through alternating current; the axis height of the annular track is aligned with that of the profiling wire, and the annular track surrounds the periphery of the profiling wire; at least one independent temperature control module, each independent temperature control module is movably arranged on the annular track, and the local temperature of the to-be-tested piece is controlled by adjusting the magnetic field intensity of the corresponding section on the profiling wire through magnetic shielding; and at least one temperature detection module, wherein each temperature detection module is used for collecting temperature distribution data in real time. Through multi-area independent temperature control, non-uniform temperature gradient loading of the front edge area, the middle section area and the tail edge area of the turbine guide blade is achieved, and the thermal stress field of the blade under the real engine working condition is accurately simulated.

The invention provides a bearing fatigue life test method and system, and relates to the technical field of bearing testing, and the method comprises the steps: obtaining the application scene characteristics of a target electric tricycle, and obtaining K test conditions; historical bearing fault record mining is carried out in combination with the model of the target electro-tricycle and the K test conditions; the working condition parameters are used as indexes, and the K historical bearing fault record sets are retrieved; traversing K historical bearing fault working condition parameter sets for parameter screening; and performing fatigue life test on the target bearing based on the K test working conditions and the K test working condition parameters, and weighting the obtained fatigue life test results of the K test working conditions to obtain a target fatigue test result. Through the bearing fatigue life testing method and device, the technical problem that the fatigue life testing accuracy is low due to the fact that the performance of the bearing under complex and changeable actual working conditions is difficult to adapt in the prior art can be solved, and the fatigue life testing accuracy of the bearing is improved by testing the fatigue life under different scenes.

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.