173 results about "Extensometer" patented technology

The invention discloses a novel man-machine interaction video extensometer measurement system and a method thereof, and the method comprises the steps: installing a test workpiece on a universal testing machine, and installing and debugging an image collection device; starting the image acquisition equipment to acquire an initial reference image of the test workpiece, then starting the universal testing machine to load the test workpiece, and continuously acquiring a deformation image of the test workpiece in the loading process until the stretch rate of the test workpiece reaches a preset threshold value of the resistance strain gauge; and transmitting the acquired image to a video extensometer measurement system, calculating the transverse strain, the longitudinal strain and the Poisson's ratio of the test workpiece according to the displacement of the deformation point in the deformation image relative to the reference standard point in the initial reference image, and displaying the transverse strain, the longitudinal strain and the Poisson's ratio through a system interface. The device and the method can not only adapt to measurement of deformation and strain of objects of various sizes, but also reduce errors caused by out-of-plane displacement of the objects. Software and hardware are combined, and accurate and efficient measurement of the video extensometer is achieved.

Extensometer (10) for measuring strain / stress on a test specimen (200) in a material testing device (190), comprising: - an imaging device (16) for producing an image of a test sample (200) which is subjected to a stress-inducing load; - a calculating device (30, 22, 24) for receiving the image of a test sample (200), for determining the movement of targets (202) on a test sample (200) and for determining the strain / stress from the determined movement of the targets (202); and - an output device (400) for outputting the specified strain / stress in real time, characterized by that the imaging device (16) and the calculating device (22, 24) are located on a single printed circuit board (15), wherein the computing device (30, 22, 24) comprises a field-programmable gate array (22) and a microprocessor (24), and wherein the entire data path from image data input to output takes place in hardware, and that the extensometer (10) has an input for receiving a trigger or synchronization signal to initiate operation or time stamping and, upon receipt of the signal, to generate a time-stamped image of the test sample (200), and that the output device (400) is designed to output the specified strain / stress along with the image with the timestamp.

The present invention belongs to the field of manufacturing engineering / digital information, and provides a method for acquiring circumferential mechanical property parameters of a pipe material. In order to obtain a more accurate and comprehensive description of a strain hardening behavior of a material, it is required to use a true stress-strain curve, such that the present invention uses a flexible tensile test fixture to perform a tensile test on a circumferential tensile pipe material sample. The tensile test process comprises: using a non-contact video extensometer and a universal tensile testing machine to obtain tensile measurement data of the pipe material; then preprocessing the tensile measurement data of the pipe material; using the preprocessed data for calculating true stress-true strain data of the circumferential tensile pipe material sample; and setting initial and end strains of a plastic section, and using a linear regression fitting method for calculating a strength coefficient and a strain hardening exponent in the plastic section. The strength coefficient and the strain hardening exponent in the plastic section and the true stress-true strain data of the circumferential tensile sample are used for finite element analysis of pipe systems.

The invention belongs to the field of metal high-temperature performance testing, and relates to a metal material high-temperature tensile testing device and testing method. The device comprises a synchronous control box, the synchronous control box is respectively connected with the electromagnetic valve, the universal testing machine, the infrared thermal imager and the three-dimensional digital image related equipment; the constant current source is respectively connected with the upper and lower parts of the high-temperature clamp; the high-temperature clamp is mounted in the universal testing machine and comprises an upper clamping part and a lower clamping part which are used for clamping a metal sample; the cooling pipeline is connected with the air compressor, and the electromagnetic valve is mounted on the cooling pipeline connected with the air compressor; during testing, speckles are sprayed on one surface, facing three-dimensional digital image related equipment, of a metal sample, and the metal sample is clamped in the middle of a high-temperature clamp; one end of the thermocouple is welded on the surface without speckles of the metal sample, and the other end of the thermocouple is connected to the constant current source and is connected to the synchronous control box. The problems that when a high-temperature extensometer is used for measuring sample deformation, the measuring range is insufficient, damage is prone to occurring, and additional interference is introduced are solved.

The invention relates to the technical field of optical fiber monitoring, and particularly discloses a distributed optical fiber sensing system and method for coal mine settlement monitoring, the distributed optical fiber sensing system comprises a measuring part and a data acquisition and processing part, the measuring part comprises an optical cable embedded in a coal mine soil body, an FBG-based osmometer and an FBG-based extensometer, and the data acquisition and processing part comprises a data acquisition and processing part. The data acquisition and processing part comprises an OFDR demodulator, an FBG demodulator and a computer, and the optical cable comprises a first optical fiber, a sheath steel pipe and a PUC outer sheath which are sequentially arranged from inside to outside. According to the distributed optical fiber sensing system and method for coal mine settlement monitoring, the optical fiber is used for measuring strain, then the strain is converted into three physical quantities including optical cable deformation, pore pressure and extensometer measurement displacement to represent the coal mine settlement condition, verification is carried out through coal mine field experiments, and the coal mine settlement monitoring accuracy is improved. The method can be used for monitoring the coal mine settlement condition.

Systems and methods for materials testing include mage devices employing camera based image capture (e.g., vision or video) for measurement of strain on the test specimen. Such systems and methods collect multiple images of the specimen under test (i.e. during a testing process), with the images being synchronized with other signals of interest for the test (such as specimen load, machine actuator and / or crosshead displacement, etc.). The images of the specimen are analyzed (e.g., in real-time and / or post-test) by algorithms to locate and track specific specimen characteristics as the test progresses.

The invention discloses a method for testing compression performance through a testing machine, which comprises the following specific steps: placing a sample on the upper end surface of a compression main body, and enabling two end surfaces of the sample to be parallel; after the extensometer is fixed, the testing machine is reset, and the extensometer is reset; starting the testing machine for compression, synchronously acquiring sample load data and average deformation data on two sides by the extensometer, transmitting the data into the testing machine, generating a stress-strain curve by the testing machine, and reading the compression yield strength, the compression elastic modulus and the compression strength from the curve. The extensometers on the two sides are directly hung between the upper cover and the compression main body to form a closed symmetrical measurement chain, so that knife edges on the two sides are located in the same rigid frame, bending deformation is offset, the reading difference is reduced to one tenth of the original value, meanwhile, a load line and a measurement line coincide, a secondary force transmission path is avoided, and the measurement accuracy is improved. And the flexibility of the rack only affects the overall displacement without changing the relative deformation in the gauge length of the extensometer, so that the repeatability of the elastic modulus is remarkably improved.

The invention relates to an extensometer returning device, an extensometer combination and a high-temperature strain measurement device, the high-temperature strain measurement device disclosed by the invention is equipped with the extensometer returning device, and the extensometer combination can slide on a guide rail according to requirements; the extensometer returning device is provided with a steering engine and a moving wheel, and the steering engine can be controlled to drive the moving wheel to slide on the longitudinal sliding rail; when the strain of the extensometer reaches the maximum value and the temperature exceeds a safety range, the extensometer returning device can release fixation according to a sensor signal and drive the steering engine to rotate reversely to drive the extensometer to be separated from the loading test device and reversely return to a starting point, so that the function of protecting a contact rod of the extensometer is achieved; the extensometer returning device is provided with a gear pump, and the maneuvering platform and the extensometer body are fixed on the guide rail through transmission of the connecting rod assembly, so that automatic separation of the extensometer and the sample is realized.

The utility model discloses a large deformation extensometer calibration device, and specifically relates to the calibration device field, the large deformation extensometer calibration device comprises a main body, one end of the main body is provided with a protection cover, the top of the main body is fixedly provided with a servo motor, the main body is internally provided with a screw rod, and the output end of the servo motor is connected with the screw rod; the lead screw is sleeved with a nut sleeve matched with the lead screw, a base is arranged at the bottom of the body, and magnetic V-shaped bases are installed at the two ends of the two sides of the base. According to the utility model, the magnetostrictive displacement sensor and the magnetic ring are arranged, and the output of the magnetostrictive displacement sensor is relative to the position of a fixed reference point, so that the magnetostrictive displacement sensor does not need to be reset when power supply is recovered after power failure, and does not need to re-find a reference point (such as an incremental encoder and an incremental grating ruler) like a common incremental sensor; the non-contact magnetic induction technology measuring device is adopted, mechanical abrasion and mechanical vibration do not exist in non-contact measurement, the reliability of the sensor is improved, and the service life of the sensor is prolonged.

The utility model discloses a metal material constant load testing device suitable for a hydrogen environment, which comprises a high-pressure gas storage bin, the high-pressure gas storage bin is hermetically connected with an upper bin cover and a lower bin cover, the upper bin cover is provided with a gas inlet pipeline, the lower bin cover is provided with a gas outlet pipeline, the high-pressure gas storage bin is filled with hydrogen, the upper bin cover is provided with an upper loading rod, and the lower bin cover is provided with a lower loading rod. The upper end of an upper loading rod is connected with a loading head, the lower end of the loading rod extends into the high-pressure gas storage bin, a load sensor is installed on the upper loading rod, a lower loading rod is arranged on the lower bin cover, the upper end of the lower loading rod extends into the high-pressure gas storage bin, the lower end of the lower loading rod is connected with a base, the lower end of the upper loading rod is provided with an upper connector, and the upper connector is connected with a lower connector. A lower connector is arranged at the upper end of the lower loading rod, a constant-load sample is connected between the upper connector and the lower connector, an extensometer is mounted on the constant-load sample, and a temperature sensor and a pressure sensor are mounted in the high-pressure gas storage bin. According to the utility model, a high-pressure hydrogen test environment can be effectively provided, and the performance test of a metal material under a constant load is realized.

This application relates to the technical field of mechanical property testing, in particular to a stress relaxation deformation testing device for fasteners and its testing method. The testing device of this application includes a connecting part connected to the fastener to be tested, and also includes a measuring part for testing the deformation of the fastener. The connecting part includes an upper connecting sleeve and a lower connecting sleeve, and the measuring part includes an upper extensometer and a lower extensometer. The measuring device of this application is convenient to use and has high precision. It can be used for conventional fasteners, such as those between specifications M3 - M16, and can be used for measuring the stress relaxation deformation of the whole under normal temperature and high temperature environments, which is close to the actual working conditions and can better meet the life design and safety factor considerations in engineering practice applications. In addition, for aerospace fasteners, testing the whole fastener is more conducive to reducing the testing cost of enterprises, alleviating the economic burden of enterprises, and creating greater value for enterprises.

The invention relates to rock sample testing equipment. The rock sample testing equipment comprises a clamp holder, a confining pressure system, a medium circulating system, a displacement sensor, an extensometer, a balance and a differential pressure sensor, the clamp holder comprises a clamp holder base and a cavity fixed on the clamp holder base, and a cavity is formed in the cavity; the confining pressure system is connected to the clamping device and used for injecting confining pressure liquid into the cavity. The medium circulating system is connected to the rock core and is used for injecting drilling fluid into two ends of the rock sample; a rubber sleeve is attached to and surrounds the rock sample, and an extensometer is arranged on the outer side of the rubber sleeve; a clamp holder sealing end cover is arranged at the bottom of the clamp holder, and a piston fixed on the clamp holder sealing end cover is arranged in the cavity; the balance is connected to one end of the rock sample; the differential pressure sensor is connected to two ends of the rock sample. According to the scheme provided by the invention, the pressure transmission process and the chemical potential difference induced seepage pressure process of the shale at high temperature and high pressure can be simulated, the drilling efficiency is improved, and the drilling cost and the risk of borehole wall instability are reduced.

The application discloses a kind of coal rock nonlinear fracture propagation length quantitative determination method based on multiple parameters, comprising: preparation of coal rock sample containing notch;Spray black and white speckle on the surface of sample, install acoustic emission sensor, clip type extensometer and displacement sensor;Carry out three-point bending peak after cycle loading and unloading fracture experiment, record load, crack opening, force point displacement, acoustic emission waveform and DIC image;Through COD-P and LPD-P curve calculation mechanics flexibility, back calculation to solve stress constraint crack length;From acoustic emission positioning, obtain the spatial distribution histogram of breakage dissipation energy, combined with DIC horizontal displacement gradient threshold cloud picture, determine equivalent crack tip and length;Further calculate coal rock fracture process zone length, and intuitively show nonlinear fracture propagation path.The application provides a kind of crack dynamic change quantitative determination method based on mechanics flexibility-displacement gradient-energy dissipation distribution multiple physical parameters, reduce the influence of human subjective consciousness, and the measurement result is accurate and reliable.

The invention provides a device and a method for testing tensile strain in an extremely low temperature environment, the device comprises a stretching mechanism, a stretching assembly and an adapter member, the stretching assembly comprises a first stretching piece and a second stretching piece, a sample piece to be tested penetrates through the first stretching piece and the second stretching piece and is detachably connected with the adapter member, and the first stretching piece and the second stretching piece are connected with the adapter member. Each of the first extension piece and the second extension piece comprises a first extension part and a second extension part, the first extension parts and the second extension parts are oppositely arranged, and two ends of the extension assembly are respectively provided with an extensometer. According to the device for tensile strain testing in the extremely low temperature environment, a rod-shaped or plate-shaped sample piece to be tested can be subjected to a tensile test, and the stretching assembly can enable the stretching sliding to be smooth in the extremely low temperature environment, so that the obtained tensile data is stable and reliable; by arranging the switching component, the tensile test is ensured to be smoothly carried out; through double-extension measurement, mean value correction can be realized, complex working conditions can be adapted, and the credibility of data can be improved.

This invention provides a method and apparatus for testing the mechanical properties of bolted composite materials in a single shear test, relating to the field of material testing and analysis. The method includes: calculating pixel equivalents and establishing a displacement conversion relationship between image displacement and actual physical displacement; adjusting the front and rear positions of the first extensometer clip and / or the second extensometer clip using positioning screws based on the spot deviation; activating the extensometer and high-speed camera to acquire extensometer displacement data sequences and tracer point sequence images, performing image displacement conversion processing on the sequence images to obtain a high-speed camera displacement data sequence; calculating the displacement deviation between the extensometer displacement data sequence and the high-speed camera displacement data sequence to generate a corrected extrusion deformation; and calculating the mechanical property parameters using real-time load, the corrected extrusion deformation, and preset specimen geometric parameters. This achieves high-precision measurement of extrusion deformation and automatic calculation of multi-dimensional mechanical property parameters in a single shear test.

The invention provides a high-temperature alloy bolt creep characteristic prediction method based on load fluctuation, and the method comprises the following steps: collecting extension data and tension data of a bolt test piece under target temperature and load, and obtaining a tensile curve and a tension curve; the extension data, the tension data, the tensile curve and the tension curve of the bolt test piece are processed, and load fluctuation and a true value used for calculating loss are determined; the load fluctuation, the cross section area of the test piece and the set load are input into a preset deep learning model, a prediction result is output, the prediction result comprises a prediction curve, and the prediction curve is used for representing the creep characteristic trend of the bolt. According to the method, the load fluctuation can be quickly measured by cheaper equipment, so that the use cost of the model in a prediction stage is remarkably reduced, the required training data is less, the creep curve of the thread test piece can be accurately predicted by training the creep test data of less test pieces, and the method is suitable for popularization and application. And the predicted curve is consistent with a true value in length and trend.

Described are opto-mechanical tower extensometers having opposing carriages whose vertical positions relative to each other are actively motor controlled so that deformation of a strain test specimen held between the grips of a mechanical testing system in a test area can be tracked and measured. Upper and lower arm assemblies are used to position optical heads within the specimen test area. Each optical head carries one or more camera assemblies, spot lighting, and optional alignment lasers. Such a system presents a compact design in which the optics can be maintained in close proximity to the test specimen throughout testing.

The invention provides a system and a method for calibrating a resistance strain gauge in an extreme low-temperature environment. The system for calibrating the resistance strain gauge in the extreme low-temperature environment comprises a flat-plate-shaped approximately-rectangular test tensile standard part, a low-temperature strain calibration module, a strain measurement module, a strain acquisition module and an extensometer acquisition module. Through the combination of the vertical strain gauges and the transverse strain gauges and the step-by-step verification of room temperature, extreme low temperature and multi-gradient low temperature environments, the deformation measurement precision is greatly improved.

The utility model discloses a full-automatic high-precision extensometer calibration instrument, and relates to the technical field of extensometer calibration instruments, in particular to a full-automatic high-precision extensometer calibration instrument, which comprises a bottom plate and a centering rod. According to the full-automatic high-precision extensometer calibration instrument, through the arrangement of a scale rod, a U-shaped plate, a first servo motor, a supporting plate, a pointer rod, a threaded rod, a first threaded ring block, a positioning sliding block, a strip-shaped plate, an electric hydraulic push rod and cavity measuring arms, the full-automatic high-precision extensometer calibration instrument has the effect that the height of the two cavity measuring arms can be conveniently lifted and adjusted; through the cooperation of the threaded rod and the first threaded ring block, the height of the lower cavity measuring arm, the extension or retraction of the movable end of the electric hydraulic push rod and the height of the upper cavity measuring arm can be conveniently adjusted, through the cooperation of the pointer rod and the scale rod, the adjusted height can be conveniently observed, and the purpose of improving the practicability is achieved.

The invention discloses a novel crack propagation meter and a use method thereof, and aims to solve the problem that a current crack propagation meter cannot accurately measure a crack propagation process. The extensometers are made of acetal resin and constantan foil resistance wire materials, the tensile strength of the acetal resin and the constantan foil resistance wire materials is far smaller than the tensile strength of a measured material, each crack extensometer selects a plurality of resistance wires, and the resistance of the resistance wires is designed to be a geometric progression with 2 as a common ratio; resistance wires are fixedly packaged on a substrate made of acetal resin at equal intervals in a parallel circuit mode, and then the crack propagation meter is manufactured. The resistance-type crack propagation meter is simple in structure, and the tensile property of the selected material is far smaller than that of the main body test material; a differential resistor is adopted in the crack propagation meter, so that the position of a fractured resistance wire can be accurately determined; the fracture of the resistance wire is reflected by measuring the change of the current in the parallel circuit, and the sensitivity is high; the crack growth meter can accurately measure the growth rate of the crack.

Disclosed example video extensometers include: a load string configured to secure a test specimen; an imaging device configured to capture images of a surface of the test specimen when secured in the load string; a storage device configured to store a plurality of first calibration parameters corresponding to intrinsic properties of the imaging device; and control circuitry configured to: perform a verification process using the first calibration parameters to verify that a plurality of second calibration parameters correspond to an arrangement of the test specimen with respect to the imaging device; and perform an optical strain measurement process to measure displacement of the test specimen based on the first calibration parameters and the second calibration parameters.

The invention belongs to the field of mechanical property detection of metal materials, and particularly relates to a method for measuring a stiffness coefficient of a tensile testing machine, which comprises the following steps of: 1) room-temperature tensile test: measuring the value of elastic modulus E1 of a tensile sample according to the scale length by using an extensometer; stopping the test at the proportional elasticity stage of the tensile sample; unloading the tensile sample; (2) the tensile testing machine adopts the cross beam platform to carry out the room-temperature tensile test again by using the tensile sample according to the scale distance length, and the elastic modulus E2 is measured; and 3) calculating the stiffness coefficient K of the tensile testing machine according to the elasticity modulus values measured twice. The method has the advantages that the stiffness coefficient of the high-rigidity tensile testing machine can be accurately, simply and conveniently measured, and quantitative separation and measurement of linear deformation of the testing machine are realized through twice elastic tensile tests of the same sample.

The present invention relates to the technical field of fatigue performance testing of industrial products, and discloses a positioning and anti-buckling device for fatigue testing of plate-like materials, comprising an anti-buckling member, a fastener, and a positioning unit. The number of anti-buckling members is two, and the two anti-buckling members are attached to each other and connected by a fastener. Each anti-buckling member is provided with a lubricating member positioning groove. The anti-buckling member and the lubricating member positioning groove are both I-shaped, and a lubricating member is provided in the lubricating member positioning groove. The anti-buckling member on the side away from the lubricating member positioning groove is provided with an extensometer positioning groove and a center screw hole. A fixing rod is detachably connected to the center screw hole. The positioning unit is used to position the test sample horizontally and vertically. The technical solution of the present invention can make the test sample evenly stressed during the test, can position the test sample, and can use a unidirectional or bidirectional extensometer to test the test sample, thereby reducing the test error and improving the accuracy of the test.

The invention provides a damping steel tensile test method, which relates to the technical field of metal material performance detection, and comprises the following steps: a testing machine adopts automatic program control, the initial tensile speed is set to be 1-5mm / min, a displacement control mode is adopted, hysteresis loop method cyclic tensile is performed for the first time, the target strain point of a first extensometer is set to be 1%, and the target strain point of a second extensometer is set to be 1%; the lower reverse point of the lag loop is 5-10 MPa, and the load holding time is 10-20 s; the strain is accumulated in sequence, the target strain point of the extensometer in each cyclic stretching is increased by 1%, the stress is unloaded to 5-10 MPa after the target strain point is reached each time, and loading is carried out again after the load is kept for 10-20 s until the sample is fractured; extracting stress-strain original data of each time of cyclic stretching, and performing data superposition on the original data extracted each time to form a stress-strain curve of cyclic stretching; and according to the stress-strain curve, analyzing the mechanical property and damping property change of the damping steel under cyclic loading.

A method of laser-based high temperature mechanical property characterization comprising the steps of providing a mechanical test frame and chamber, loading a specimen in the mechanical test frame in the chamber, providing a laser, aligning the laser, sealing the chamber, evacuating 5 the chamber and optionally backfilling with a prescribed atmosphere, turning on the laser, applying mechanical loading to the specimen in the mechanical test frame, utilizing a load cell and a non-contact video extensometer, synchronizing the output of the load cell and non-contact video extensometer, and tracking the strain in the specimen. A device for laser-based high temperature mechanical property characterization comprising a vacuum chamber with a laser 10 transmissible window and viewing window, a vacuum pump, a uniaxial tensile system inside the vacuum chamber, a thermocouple inside the vacuum chamber, laser optics inside the vacuum chamber, a function generator, a laser source, an IR camera, and a video camera.

The present application relates to the field of fatigue test, in particular to a kind of tubular sample dynamic liquid lead bismuth alloy loop corrosion fatigue test device and use method.Tubular sample is installed between upper and lower base, the lower end of tubular sample is sequentially communicated with the through hole in lower base, liquid lead bismuth alloy inlet pipe, the upper end of tubular sample is sequentially communicated with the through hole in upper base, liquid lead bismuth alloy outlet pipe.Tubular sample outer paste thermocouple real-time monitoring and control liquid lead bismuth temperature, outer surface installation extensometer strain measurement.Liquid lead bismuth is driven by electromagnetic pump through storage tank, enters reaction kettle and is heated and oxygen is controlled, after flow rate is measured by flowmeter, it flows into tubular sample, then backflow to storage tank and forms loop.The outer wall of loop pipeline is equipped with armored electric heating and thermal insulation cotton, to ensure temperature control.The present application realizes the accurate control of high-temperature liquid lead bismuth temperature, dissolved oxygen and flow rate, supports dynamic strain control fatigue test, and evaluates the corrosion fatigue performance of material in flowing high-temperature liquid lead bismuth environment.

The invention belongs to the technical field of pipeline steel testing, and discloses a device and a method for measuring the elongation of a slow tensile test in a high-pressure hydrogen environment. The method comprises the following steps: mounting a to-be-tested sample in a hydrogen environment box with a transparent kettle cover on the side wall; charging hydrogen into the hydrogen environment box; and after hydrogen charging, carrying out a slow tensile test on the sample to be tested, and at the same time, carrying out video capture and recording on the gauge length section of the sample in the hydrogen environment box through the transparent kettle cover by using a 3D video extensometer arranged outside the hydrogen environment box. The transparent kettle cover is adopted, the 3D video extensometer is combined, and the tensile displacement of the gauge length section of the sample can be accurately measured through the transparent kettle cover, so that the accurate elongation of the slow tensile test sample is obtained.

The invention discloses a high-pressure hydrogen environment box and a test method for balancing pressure and reducing friction. The environment box comprises a test box body and a gas chamber, a sealing cavity is formed in the test box body; the air chamber is arranged on the test box body in a penetrating mode to form an upper air chamber and a lower air chamber, the upper air chamber and the lower air chamber are communicated with the internal sealing cavity, an upper piston rod is fixedly installed in the upper air chamber, and a lower piston rod is arranged in the lower air chamber in a sliding mode. The upper piston rod and the lower piston rod are respectively sealed with the upper air chamber and the lower air chamber through sealing structures, and the upper piston rod and the lower piston rod are used for mounting a test piece and an extensometer; the invention aims to solve the problems that when a high-pressure hydrogen environment fatigue device in the prior art carries out a fatigue test, an environment box and a piston rod are sealed only by using a sealing ring, so that air leakage is easily caused, and if multiple sealing rings are used, internal and external pressure difference is caused, so that friction force is increased, and test data are influenced.

The utility model discloses a plate tension and compression fatigue buckling prevention device, which belongs to the technical field of plate detection, and comprises a testing machine wedge-shaped mechanism, a bending and stretching prevention mechanism and a plate body, the bending and stretching prevention mechanism comprises a first clamping plate and a second clamping plate and is positioned in the testing machine wedge-shaped mechanism; the plate body is located between the first clamping plate and the second clamping plate, the first clamping plate and the second clamping plate are each provided with a plurality of first threaded holes, and the first threaded holes in the first clamping plate correspond to the first threaded holes in the second clamping plate in a one-to-one mode and are connected through first bolts. An extensometer mechanism is further arranged on the side face of the bending and stretching prevention mechanism. By using the device, large friction force generated by direct contact between the buckling-restrained mechanism and the plate body can be avoided, the extensometer mechanism cannot be interfered, the device is suitable for the plate bodies with different thicknesses, and it is guaranteed that the plate body is always kept in a centering state in the test process.

A method for measuring the deformation displacement of a high-temperature tensile test specimen belongs to the field of experimental mechanics high-temperature testing technology, and solves the problem of electronic components being unable to withstand high temperatures and having low precision in deformation displacement measurement in high-temperature environments. The method of the present invention is implemented through a high-temperature displacement measurement module, a normal-temperature displacement measurement module, and a connection module. A pair of high-temperature resistant sliders are provided in the high-temperature box, each connected to a retractable high-temperature contact, and can slide along a guide rod parallel to the axis of the specimen; each slider is staggeredly connected to the lower and upper normal-temperature sliders on the same axis outside the high-temperature box through a high-temperature resistant and inelastic silk thread, converting the high-temperature environment displacement to a normal-temperature environment; then, the dynamic relative displacement of the two normal-temperature sliders is measured by a normal-temperature extensometer and introduced into the tensile test system. The method of the present invention breaks through the limitations of high-temperature environments on electronic components for displacement measurement, has the characteristics of a wide range of applications, high measurement precision, and low cost, and is suitable for deformation displacement measurement in metal tensile tests over a large temperature range.