1873results about "Material strength using steady bending forces" patented technology

The invention relates to a concrete degradation simulation method and system under continuous load-chloride ion coupling, and solves the problems that systematic research on overall mechanical property degradation of a concrete structure under the load and chloride ion coupling effect is lacked, and the degradation condition of the concrete structure in an actual service environment is difficult to comprehensively reflect. The method comprises the following steps: applying a continuous load to a test block, preparing a solution according to a stress type to determine a chloride ion diffusion direction, applying an electric field to accelerate migration and maintain test stability, and after an experiment, measuring the penetration depth and calculating a diffusion coefficient; in the process, multi-dimensional data such as cracks and acoustic emission are collected and subjected to PCA dimension reduction and redundancy removal, then damage factors are inversed through deep learning modeling in combination with dual-stage optimization and physical constraint, and finally damage and chloride ion parameters are fused to form gradient parameters fitting actual degradation. The method has the following effects that the concrete degradation process is accurately simulated, a basis is provided for durability evaluation and life prediction, and the engineering safety and economy are improved.

The present disclosure relates to an apparatus and method for measuring an elastic modulus. The method of measuring an elastic modulus of a specimen including a conductive material and an insulating material with which a surface of the conductive material is coated includes a first bending test operation of applying a first load to a first surface of the specimen, a second bending test operation of applying a second load to a second surface that meets the first surface of the specimen, a first calculation operation of calculating a first bending elastic modulus of the specimen based on a first value measured in the first bending test operation, a second calculation operation of calculating a second bending elastic modulus of the specimen based on a second value measured in the second bending test operation, and a third calculation operation of calculating an elastic modulus of the conductive material and an elastic modulus of the insulating material based on the calculated first bending elastic modulus and the calculated second bending elastic modulus.

The invention discloses a testing machine for fatigue bending resistance of a piston rod of a hydraulic hoist, and relates to the technical field of hydraulic hoist detection equipment, the testing machine comprises a bottom plate, and a vertical impact simulation assembly and a horizontal impact simulation assembly for simulating impact loads in the vertical and horizontal directions are arranged above the bottom plate. According to the testing machine for the fatigue bending resistance of the piston rod of the hydraulic hoist, through the arrangement of the vertical impact simulation assembly and the horizontal impact simulation assembly, instant impact loads encountered by the piston rod of the hydraulic hoist in actual work, such as water flow impact and sudden blocking of a gate, can be accurately simulated; the defect that only static or stable cyclic bending loads are concerned in a traditional test is overcome, the test environment is closer to the real working state of the piston rod, meanwhile, after the test is finished, the vertical impact simulation assembly and the horizontal impact simulation assembly are matched, the piston rod clamped on the clamping base can be rapidly taken out, and the automatic material taking efficiency is high.

The invention discloses a flexible circuit board production quality monitoring method and system based on data feedback, and the method comprises the steps: collecting the physical parameters of development etching, drilling and copper plating processes, such as line width, line distance, aperture, roundness and copper thickness, and workshop temperature and humidity and dust concentration data; generating a single-variable control chart for a single-process physical parameter, generating a multivariable T2 control chart for a multi-coupling parameter process, and calculating a process stability index and a comprehensive fluctuation index; inputting the abnormal data into a BP neural network, identifying an abnormal mode type and outputting characteristic parameters; generating a parameter correction instruction according to the abnormal mode and the characteristic parameters, and adjusting equipment parameters in real time; recalculating the process capability index based on the adjusted data, and triggering secondary feedback if the process capability index does not reach the standard; and dynamically adjusting the threshold value of the control chart according to the standard deviation and the mean value of the process capability indexes of the continuous batches. Production key parameters are comprehensively covered, abnormity is found in time, accurate and comprehensive detection is achieved, real-time adjustment is achieved, stability and controllability are ensured, and the product quality is improved.

The invention relates to the technical field of pipe strength detection, and particularly provides a PEXA pipe strength detection table which comprises a base, a constant temperature box, a water injection detection mechanism, a supporting plate and an adjusting simulation mechanism. The end, connected with the moving plate, of the pipe is adjusted through cooperation of the rotary locking part, the telescopic part and the plugging locking part, the bending angle of the pipe is adjusted, the bending angle of the pipe is simulated through cooperation with the water injection detection mechanism, and different bending angles are adjusted. Therefore, the hydrostatic strength detection of the pipe in the bending state and the hydrostatic strength detection of the pipe in different bending states are realized, the hydrostatic strength of the pipe is comprehensively evaluated, the strength detection of the pipe is more comprehensive, accurate and reliable, and the problem that the detection is qualified in the linear state but fails in actual bending use is avoided.

The invention discloses a glass limit cold bending electric loading device and a loading test method, and relates to the technical field of glass cold bending test.The glass limit cold bending electric loading device comprises a welding seat body and an extension loading device, a nut lifting type lifter is arranged in the lower end of the welding seat body, the front side of the nut lifting type lifter is connected with a supporting plate, and the left and right positions of the rear end of the supporting plate are connected with linear rails; a lead screw motor is arranged at the top of the welding seat body and connected with a lead screw, a pressure sensor is arranged at the bottom of the lead screw, the lower end of the pressure sensor is in threaded butt joint with a spherical hinge, and the bottom of the spherical hinge is connected with a loading pressure head; the extension loading device is introduced and matched with the loading pressure head to form a multi-loading-point structure, so that the cold bending loading test is more stable, and meanwhile, the position of an auxiliary loading point and the size of the auxiliary loading point can be flexibly adjusted through the combination of the adjusting assembly and the extension assembly, so that the cold bending loading test of the glass plate is more efficient and more stable.

The invention discloses a method for testing interlayer tensile strength of a ceramic matrix composite material. Comprising the following steps: acquiring the geometric dimension of a sample, performing surface treatment on a test surface of the sample, marking a test section of the sample, acquiring the geometric dimension of a four-point bending clamp, determining a placement mode of the sample and a camera, and capturing a displacement field of the test surface of the sample by using the camera while performing a curved beam four-point bending test. Obtaining the load value and stroke of the first load drop, extracting the in-situ strain of the sample by using a camera, deducing a formula for calculating the interlayer radial and tangential modulus ratio of the sample, carrying out calculation, and calculating the interlayer tensile strength of the sample by using the existing formula. According to the method disclosed by the invention, the modulus ratio of the interlayer radial direction to the interlayer tangential direction is obtained by using in-situ strain, the problem that the interlayer radial modulus is difficult to accurately determine directly through the test is solved, and the accuracy of the interlayer tensile strength of the ceramic matrix composite material measured through the curved beam four-point bending test is improved.

The invention provides a method and a system for testing the bonding strength of a laser cladding layer. According to the method, mechanical change data and energy release data at the crack tip are collected through a laser measurement device and a sound signal detection device, and a map is generated after alignment according to time. A laser distance measuring device is arranged to adjust the measuring frequency, and the multi-angle image shooting and three-dimensional scanning technologies are combined to record the three-dimensional path and the three-dimensional shape change. And calculating a minimum energy value based on the atlas and the three-dimensional path, inputting the minimum energy value and the position information into an intelligent decision model, and outputting a loading direction adjustment angle and a pressure change amplitude. And then the moving path of the bending test head is corrected, the output force of the hydraulic device is regulated and controlled, and the reliability reduction index is calculated in combination with three-dimensional data. According to the invention, accurate evaluation of the reliability of the laser cladding layer material and efficient control of crack propagation are realized.

The invention discloses full-size reciprocating type four-point bending test equipment in different strain states, which comprises a power system, a connecting seat, a loading clamp and a supporting mechanism, the power system is connected with the connecting seat, the supporting mechanism is positioned below the power system, the supporting mechanism is used for movably connecting a sample to be tested, and the loading clamp is used for loading the sample to be tested. In the state that the supporting mechanism is movably connected with the sample, the two ends of the sample can rotate and move in the transverse direction relative to the supporting mechanism in the testing process, the loading clamp is detachably and fixedly connected to the connecting base, and the bottom end of the loading clamp can be arranged at the radial center of the sample in a penetrating mode in the testing process and is detachably connected; the loading clamp designed by the invention is arranged at the radial center part of the sample in a penetrating manner, so that the contact area is increased, the stress concentration caused by point contact or line contact of a traditional pressure head is avoided, and the horizontal deviation or local distortion of the pipeline during bending caused by asymmetric load is avoided.

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 strike-slip fault buried pipeline test loading device capable of considering soil body action, and belongs to the technical field of geotechnical engineering tests. The device comprises a double-shaft loading system, a fixing device, a pipeline system and an axial force and bending moment combined loading system, the device is specifically divided into a three-dimensional adjustable reaction frame, an axial servo actuator, a radial servo actuator, a distribution cross beam with a movable hinged support, a pipe hoop restraint device, a pipeline test piece, an adjustable arc-shaped supporting cushion block, a flange type end plate, a movable hinged support and an adjustable spring set. And meanwhile, a loading curve of the axial force and the bending load of the pipeline under strike-slip fault dislocation is established. And the axial servo actuator and the radial servo actuator carry out four-point bending loading on the pipeline according to the established load applying curve of the axial force and the bending moment. According to the test device and the loading system, the stress state of the oil and gas pipeline under strike-slip fault dislocation can be reproduced, and the failure mode and deformation characteristics of the pipeline without soil constraint under axial force and bending moment loads are disclosed.

The invention discloses cement strength detection equipment for railway engineering detection based on an intelligent sensor, and relates to the technical field of cement strength detection. The cement strength detection equipment for railway engineering detection based on the intelligent sensor comprises a base, the top of the base is fixedly connected with a table board, and the top of the table board is fixedly connected with an electric hydraulic cylinder; an L-shaped rotating block; the bottom of the electric hydraulic cylinder is rotationally connected with an L-shaped rotating block through a first rotating shaft, a first fixing block is fixedly connected to the right face of the front side of the L-shaped rotating block, the bottom of the first fixing block is movably connected with a first hydraulic block through a first pushing block, and the top of the first hydraulic block is fixedly connected with the side face of the electric hydraulic cylinder through a second fixing block. The first hydraulic block is fixedly connected with a second hydraulic block through a first hose, and the top of the second hydraulic block is movably connected with a lifting block through a second push block. According to the cement strength detection equipment for railway engineering detection based on the intelligent sensor, when the equipment is used, the L-shaped rotating block is rotated to drive the lifting block to ascend, so that manual operation is reduced when a detection mode is changed.

The invention belongs to the technical field of stress corrosion tests, and particularly relates to a dry-wet alternating environment stress corrosion test device and method.The test device is simple in structure, convenient to operate and suitable for stress corrosion tests of metal materials of dry-wet alternating parts of ships, wharfs and other equipment facilities. Therefore, the corrosion performance and the residual life of the metal and the component thereof under the stress action of pulling, bending and the like in the dry-wet alternate harsh marine environment are measured, and a basis is provided for material selection, structural design and the like of key stress parts such as related equipment facilities. The test method is based on corrosion equivalent conversion, the seawater medium flow velocity is controllable, stress corrosion test parameters of the dry-wet alternating environment can be reasonably determined, and corrosion damage of the dry-wet alternating part of the equipment under the long-term stress service condition can be rapidly reproduced under the condition that the stress corrosion mechanism and the damage development process are not changed; the test time is greatly shortened, the test cost is reduced, and rapid screening and examination verification of novel structures / materials of equipment are realized.

The invention discloses a mechanical property testing device for mixed directional fiber ultra-high performance concrete, which comprises a base, a power mechanism is arranged on the base, fixed rotating components are movably arranged on the left side and the right side of the power mechanism, and the power mechanism drives the fixed rotating components on the two sides to synchronously and reversely move; a supporting assembly is arranged in the middle of the top end of the base. A loading assembly is arranged above the supporting assembly. A test piece is loaded between the fixed rotating assemblies on the two sides, the supporting assembly is used for bearing the test piece, the form of a supporting surface can be changed according to test requirements, and the loading assembly is located on the upper side of the test piece so as to apply vertical pressure to the test piece; the device can acquire various test data such as compression resistance, tension resistance, torsion resistance and wear resistance in real time, can comprehensively reflect the mechanical properties of the mixed oriented fiber ultra-high performance concrete, provides an accurate and reliable test basis for engineering application and performance optimization of such materials, and solves the problems that the existing device has single test data and cannot meet the engineering practice requirements.

The invention discloses a multi-station synchronous plastic cup spoon full-surface visual defect detection device and method, and relates to the technical field of visual detection.The multi-station synchronous plastic cup spoon full-surface visual defect detection device comprises a multi-station rotating platform, multiple sets of flexible jigs used for clamping parts to be detected, a multi-station detection module and a detection controller; the four detection modules sequentially cover surface texture, three-dimensional morphology, material characteristics and mechanical property full-dimensional defects of a to-be-detected part; 2D characteristics such as surface smudginess, scratches and printing defects are captured through a multispectral camera; the 3D point cloud reconstruction module identifies three-dimensional shape defects such as pits and deformation through laser or structured light scanning; the hyperspectral material detection module is used for identifying material variation and wear degree through spectral analysis; the dynamic stress test module detects hidden mechanical defects such as stress whitening and microcracks through a loading test.

The invention relates to the technical field of metal material fracture resistance testing, in particular to a prediction method for interface fracture toughness of a polar region ship composite steel plate, which comprises the following steps: S1, preparing a composite steel plate; s2, carrying out a three-point bending fracture test; s3, performing an interfacial shear strength test; s4, data analysis and model construction: performing fitting analysis on the obtained fracture toughness data of the large-size sample and the obtained shear strength data of the small-size sample, determining undetermined parameters, and constructing a mathematical model between the interface fracture toughness and the interface shear strength of the composite steel plate; and S5, verifying the accuracy of the model. According to the method, the mathematical model is established by analyzing the correlation between the shear strength measured by the small-size interface shear sample and the fracture toughness measured by the large-size fracture sample, and the model has the advantages of simplicity in construction, rapidness in use and the like, so that rapid prediction and evaluation of the fracture toughness of the composite steel plate are realized, the test process is greatly simplified, and the test efficiency is improved. And the research and production efficiency is 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 relates to the technical field of detection and testing, and provides a pipe fitting torsion testing machine. The pipe fitting torsion testing machine comprises a base, a driven mechanism, a driving mechanism and a vertical loading mechanism, a groove is formed in the upper surface of the base, a sliding groove is further formed in the upper surface of the base, and the driven mechanism is connected into the groove. According to the pipe fitting torsion testing machine provided by the utility model, a torsion load loading system, an axial pressure load loading system and a transverse pressure load loading system are highly integrated, so that torsion, axial and bending three-axis composite loading can be realized on single equipment unprecedentedly; the real stress environment of pipe fittings such as geological drill rods under extreme working conditions is reproduced to the maximum extent, compared with a traditional single-axis or two-dimensional loading test, the test result can more accurately predict the actual service performance and failure mode of the pipe fittings, and the applicability is wider.

The invention provides a sealing joint test system and test method. The sealing joint test system comprises a test platform, a first fixing mechanism, a second fixing mechanism, a first load applying mechanism, a second load applying mechanism, a pressure test mechanism and a heating temperature control mechanism. The first load applying mechanism is used for applying an axial load to the sealing joint; the second load mechanism is used for applying a bending moment load to the sealing joint; the pressure testing mechanism is used for applying pressure to the sealing joint; and the heating temperature control mechanism is used for heating the sealing joint to a preset temperature and keeping the temperature of the sealing joint unchanged. According to the sealing joint test system provided by the invention, the first load applying mechanism, the second load applying mechanism, the pressure test mechanism and the heating temperature control mechanism are arranged to test the sealing joint in the environments of axial load, bending moment load, ultrahigh pressure and high temperature, so that the sealing performance of the sealing joint is ensured.

The invention discloses an aviation thermoplastic bending performance detection device and method, the device comprises a base body, a temperature control mechanism is arranged above the base body to control the temperature of the environment of a detected sample, a supporting seat is arranged above the base body, the supporting seat is arranged to be bilaterally symmetrical about the center of the base body, and the supporting seat is arranged above the base body. The base body is used for supporting the left end and the right end of a detected sample, a bending and pressing mechanism is arranged above the base body and is used for carrying out a bending test on the detected sample, and an auxiliary resetting mechanism is arranged below the bending and pressing mechanism. According to the aviation thermoplastic bending property detection device, a temperature-adjustable detection environment is provided for a detected sample through the arrangement of the temperature control cover, the detected sample can be heated by heating the environment, and the detected sample is recovered to the original shape by matching with the auxiliary reset mechanism, so that the material state of the detected sample is better observed; and a clamping and locking mechanism capable of locking plastics with different shapes is arranged on the supporting seat, so that the application range of the device is widened.

The invention relates to a multifunctional test loading device for simulating bending shear torsion performance of a wind power tower, which comprises a counter-force column, a counter-force longitudinal beam, a counter-force cross beam and four actuators, and is characterized in that the counter-force cross beam is fixed at the top of the counter-force longitudinal beam through a bolt and is connected with a first actuator for axially applying pressure; the bottom of the tower drum is connected and fixed through a loading support with a kidney-shaped hole, and the end of the tower drum is connected with a loading beam through a conversion piece and abuts against a first actuator for axial pressure applying and loading. A fourth actuator on one side of the reaction wall is used for applying horizontal shearing force and torque; second and third actuators on the upper and lower sides of the counter-force longitudinal beam are used for applying bending moment; according to the device, loading of multiple load types can be achieved on the tower drum, the complex stress condition possibly borne by the tower drum in the actual use process can be simulated, and loading of any change of a single load of the tower drum can also be simulated; the device is suitable for loading and fixing tower barrels of different types and sizes; and the influence of torsional deformation and horizontal displacement on vertical load loading can be reduced through structural measures.

The invention relates to flexible composite pipe multifunctional complex load test equipment and a test method thereof, and the flexible composite pipe multifunctional complex load test equipment comprises a dynamic stretching-torsion power unit, a test unit, a static torsion unit and an installation auxiliary unit. The dynamic tension-torsion power unit, the test unit and the static torsion unit are coaxially and sequentially connected together, the dynamic tension-torsion power unit is connected with the test unit through a pressure torque load transmission short section, and the other end of the test unit is connected with the static torsion unit through a tension torque load transmission short section; the installation auxiliary unit and the dynamic stretching-twisting power unit are arranged on the installation base frame in parallel, the installation base frame is connected with the base frame guide rail in a sliding mode, and the installation auxiliary unit is composed of a plurality of flexible composite pipe brackets arranged side by side. The mechanical property measurement of the flexible composite pipe under the complex load can be realized, one machine has multiple functions, and the investment and the equipment operation and maintenance cost are greatly reduced.

The invention relates to an experimental device and method for testing the comprehensive mechanical property of a slender flexible cable, and belongs to the technical field of ocean engineering testing. The device comprises a main body frame, a tensile loading device, a bending load loading device and a torsional load loading device. The tensile loading device is not directly connected with the main body frame and is directly connected with the end part of the cable during an experiment. Through a modular integrated design, multi-axis coupling cooperative loading of stretching, bending and twisting is realized; a stretching actuator provides axial tension; the four-point bending actuator drives the slide rail and the roller to realize dynamic bending, and the bending radius is adjustable; the torsion actuator converts linear motion into torque through a gear-rack mechanism, and the supporting rollers eliminate axial interference. The device has the functions of pressure self-adaptive control and energy recovery. The device solves the problem that a traditional testing machine cannot simulate complex ocean working conditions, and is suitable for comprehensive mechanical property evaluation of flexible pipe cables such as submarine cables.

The invention provides a composite material damage type identification method based on multiple characteristic parameters of an acoustic emission signal, which comprises the following steps: designing and carrying out an acoustic emission signal acquisition test aiming at a composite material damage evolution behavior; key acoustic emission signal features are screened out based on a principal component analysis method, and the corresponding relation between a clustering result and a damage form is verified; a transient damage contribution index is proposed based on a clustering result to represent the contribution degree of each damage to the overall damage at a certain moment, and a damage function is proposed in combination with strain energy. The method effectively solves the bottleneck problems of high feature redundancy and serious mode confusion of the traditional acoustic emission signal, perfects the spatial correlation model of the energy release rate and the damage mode in the composite material progressive damage theory, provides an experimental basis for establishing an anisotropic damage constitutive equation considering the laying layer direction, and has a wide application prospect. And a new method is provided for online monitoring of a composite material structure under a complex working condition.

The invention provides constructional engineering reinforcing steel bar quality detection equipment, and relates to the technical field of reinforcing steel bar quality detection.The constructional engineering reinforcing steel bar quality detection equipment comprises a detection table, clamping assemblies are arranged at the two ends of the top of the detection table, each clamping assembly comprises a vertical plate, the vertical plates are fixed to the two ends of the top of the detection table, and shaft rods are rotationally installed on the inner side surfaces of the vertical plates through bearings; a driving motor is fixed to the outer end of a vertical plate on one side of the detection table, the output end of the driving motor is fixedly connected with the shaft rod, two limiting assemblies are symmetrically arranged on the surface of the middle of the detection table, each limiting assembly comprises a base, and the bases are fixed to the detection table. Two steel bars of the same specification can be fixed at the same time through the clamping assembly and the limiting assembly on the detection table and are used for bending resistance detection and tensile test respectively, independent tests of the two steel bars do not affect each other, the time for replacing the steel bars is saved, and the quality detection efficiency of the steel bars of the same specification is higher.

A method and apparatus for testing a specimen with pressure, applying a torque using one or more plates coupled to the test specimen, applying a bending moment, and / or applying an axial load, either separately or simultaneously, with or without rotating the specimen, and without the applied forces interfering with each other.

The invention relates to the technical field of high-voltage line mirror bracket safety testing, and discloses a high-voltage line mirror bracket split type safety link structure testing method and system. According to the method, plugging and bending tests are carried out on a high-voltage line mirror bracket split type link structure through a mechanical arm, and interface pressure and structure deformation image data are collected in real time. And analyzing interface wear and structural fatigue damage characteristics by using a pre-trained wear detection model, and outputting a real-time wear degree evaluation result. And after the test period is finished, integrating the multi-modal data and the evaluation result to generate a three-dimensional visual detection report, positioning a wear concentration position, marking an abnormal wear point and quantifying the structural safety level. According to the invention, the problems of incomplete test and inaccurate evaluation in the prior art are solved, and the product safety and reliability are improved.

The invention discloses an aviation cable tensile strength auxiliary detection mechanism, and relates to the technical field of cable tensile detection. The device comprises an anti-stretching detection machine, a hollow cable knot fixing mechanism is arranged at the bottom of the anti-stretching detection machine and used for fixing one end of a cable body, a numerical control sliding rail is arranged on the front side face of the anti-stretching detection machine, and the anti-stretching detection machine is electrically connected with the numerical control sliding rail. According to the invention, through the arrangement of the auxiliary bending resistance detection mechanism, an internal thread sleeve II horizontally moves rightwards to drive a locking block to horizontally move rightwards, and the locking block horizontally moves rightwards to apply a reverse force to a cable body penetrating through the surface of the locking block, so that the cable body is pulled up under different horizontal lines with two groups of reverse unbalanced forces; the bending extreme value of the cable body can be detected to the greatest extent, whether the toughness of the cable body reaches the standard or not can be detected, and a stable guarantee is provided for later actual use of the cable.

The invention relates to a wind power tower bending shear torsion test loading anti-interference decoupling switching integrated device, which comprises a reaction wall, a support, a reaction column, a reaction longitudinal beam, a reaction cross beam and four actuators, and is characterized in that the top end of a fixed tower on the support is connected with a loading beam through a switching device; the first actuator applies axial load to the tower drum through the loading beam and the switching device, the second actuator and the third actuator apply bending moment to the end of the tower drum through the loading beam and the switching device, the fourth actuator is matched with the connecting piece, the rectangular steel plate is connected with the switching device to apply horizontal shearing force and torque to the end of the tower drum, and application and decoupling of various types of loads are achieved. The test precision is ensured; the device can truly simulate the load condition of the tower drum section, can also be matched with the loading beam to transmit the axial force, the bending moment, the shearing force and the torque to the wind power tower drum, and effectively solves the influence of horizontal displacement and torsional deformation on loading in the horizontal and vertical load coupling loading process in the wind power tower drum composite load simulation test.

The invention discloses an automobile body structural member connection point strength detection device, and belongs to the technical field of automobile body structural member detection, the automobile body structural member connection point strength detection device comprises a rack and mounting racks symmetrically fixed on the rack, the mounting racks are slidably connected with a supporting plate, the top of the rack is connected with a first hydraulic cylinder, and the top of the first hydraulic cylinder is connected with a second hydraulic cylinder; a first pressing plate is fixedly connected to the output end of the first hydraulic cylinder; through the synergistic effect of a push block, a guide block, a limiting block, a clamping block and a fourth spring, when a cross beam deforms or breaks in the connecting point strength detection process, the cross beam presses an ejector rod, the ejector rod only needs to generate tiny displacement, the guide block is pushed to drive the limiting block to move, limiting on the clamping block can be relieved, and at the moment, the clamping block is not prone to deformation or breakage. And the stretched fourth spring is reset to pull the clamping block to move downwards, so that an insulating plate at the bottom of the clamping block is inserted between the two metal blocks, a circuit of the second hydraulic cylinder is disconnected, the bending resistance detection of the cross beam is terminated, and unnecessary extra workload is effectively avoided.