42 results about "Pure shear" patented technology

The invention provides a method and device for calculating the crack propagation rate of a rubber material and a computer terminal.The method comprises the steps that the change of structural parameters of a unit rubber material under pure shear deformation is recognized, the change of the structural parameters is processed, and the network chain conformation entropy change of the rubber material is obtained; obtaining rubber free energy change according to the network chain conformation entropy change, and obtaining a stress-strain corresponding relation based on the rubber free energy change and the network chain conformation entropy change; obtaining the strain energy density of the macroscopic rubber material according to the stress-strain corresponding relation, obtaining a tearing energy peak value based on the strain energy density, and then obtaining the crack growth rate by combining the calculation logic of a crack growth rate model of Lake-Lidley. According to the method, a new calculation model of the crack growth rate is provided from the principle, and a theoretical basis is provided for life prediction and maintenance of rubber materials, rubber design and modification, fault analysis and damage tolerance design.

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 present invention relates to the field of smart materials technology, and more particularly to a non-sequential three-state rocking mechanism driven by an electroactive material. The mechanism comprises a rotational angle actuator, a boundary controller, and a diamond-shaped driver. The boundary actuator comprises a connecting frame, a flexible beam, and a guide block. The connecting frame comprises a cross-shaped transverse frame and a vertical frame, with the guide block suspended from the transverse frame by a flexible beam. The rotational angle actuator comprises a semi-enclosed frame structure and a pure shear dielectric elastomer film, connected to the guide block via the pure shear dielectric elastomer film. The present invention converts the planar deformation of the dielectric elastomer material into bending deformation of the mechanism. By adjusting the voltage on the pure shear dielectric elastomer film, steady-state control of different rotational angles is achieved, allowing the mechanism to switch between three states under voltage drive.

The present invention discloses a ZnO piezoelectric coating material capable of exciting pure shear waves, a preparation method thereof, and an application thereof, belonging to the field of coating materials. The method comprises: using Zn as a target material, depositing ZnO as a ZnO piezoelectric functional layer on the surface of a substrate by magnetron sputtering; in the magnetron sputtering, the sputtering temperature is above 200°C, a mixed gas of argon and oxygen is introduced until the pressure in the cavity is 1.0-2.5 Pa, the sputtering power is 400-700 W, and the sputtering time is 3-6 hours; or, in the magnetron sputtering, the sputtering temperature is 50-200°C, a mixed gas of argon and oxygen is introduced until the pressure in the cavity is 1.0-2.5 Pa, the bias voltage is ‑100V-‑200V, the sputtering power is 400-700 W, and the sputtering time is 3-6 hours. The present invention adopts magnetron sputtering technology to deposit ZnO on the surface of the substrate as a ZnO piezoelectric functional layer. By adjusting the sputtering temperature or bias voltage during the magnetron sputtering process, a ZnO piezoelectric coating material that can excite ultrasonic pure shear waves is prepared, thereby realizing the measurement of subtle changes in the thickness of the workpiece.

The invention relates to the technical field of mechanical property testing, in particular to a laminated plate mechanical property evaluation method and system based on strain data. The method comprises the following steps: performing a biaxial tensile experiment on a laminated plate sample, synchronously acquiring load time-history data and a full-field speckle image, constructing a full-field strain matrix through a mapping algorithm, dispersing the full-field strain matrix into nodes, dividing a core pure shear region and a stress diffusion region, and then obtaining first principal strain through principal component analysis; a load transmission efficiency attenuation spectrum and full-field strain energy entropy density are calculated respectively, a dynamic correction model is constructed in combination with weighted coupling of preset shape characteristic parameters, and a real constitutive curve is obtained by using the model to calculate correction coefficient inversion nominal stress; the thermodynamic entropy characteristic is introduced, so that the problem that the stress field distortion at the nonlinear damage stage of the material is difficult to sense by a traditional method is solved, and the biaxial mechanical property test precision of the laminated plate is effectively improved.

The invention discloses a rock multifunctional shear experiment testing device and a using method, the rock multifunctional shear experiment testing device comprises a longitudinal loading frame and a base, the longitudinal loading frame is arranged on the base, a first mounting plate and a second mounting plate are fixedly connected to the base, a lower shear box is fixedly mounted on the base, the corresponding side surface of the lower shear box is fixedly connected with the first mounting plate, and the second mounting plate is fixedly connected with the second mounting plate. An upper shear box is mounted above the lower shear box, a vertical jack is arranged on the longitudinal loading frame, a horizontal jack is arranged on the second mounting plate, and a sliding strip is arranged at the top end of the lower shear box. According to the multifunctional rock shearing experiment testing device and the using method, the defects that in the prior art, during testing, a stress point is not prone to being kept in the center, and rock is prone to twist off instead of pure shearing due to bending moment are overcome, and the accuracy of rock shearing data is improved.

This application discloses a creep testing device for a fiber composite-steel interface. The device horizontally supports the specimen using a first support and a second support. A first loading mechanism applies a downward vertical force to the specimen, with the point of application located between the first end and a pre-fabricated crack. A second loading mechanism applies a downward vertical force to the specimen, with the point of application located between the second end and the pre-fabricated crack. The fiber composite-steel beam interface of the specimen primarily bears Type II interfacial shear stress caused by bending deformation, while the Type I peel stress approaches zero. This avoids the combined stress-shear + peel stress generated by direct tension in traditional lap joints, enabling the test results to accurately reflect the interface's durability under pure shear.

The invention belongs to the technical field of material analysis, and relates to a tire rubber fatigue crack propagation test method which comprises the following steps: preparing a sample wafer of a rubber product; determining the direction of the crack propagation test according to the rolling direction of the rubber sample sheet, and cutting to obtain a pure shear fatigue crack propagation test sample with a notch on a single side; performing a critical tearing energy test under the temperature condition of 0-70 DEG C to obtain a relationship between the critical tearing energy and the temperature; determining R = 0 and 0lt; rlt; 1, the relationship among the crack propagation rate, the crack propagation length and the temperature under different temperature conditions. The invention provides a test method and a parameter determination method aiming at a rubber material with a strain crystallization characteristic and considering the influence of the strain crystallization characteristic on a fatigue crack propagation characteristic, and the strain crystallization rubber at 0lt can be obtained through the parameters of the invention; rlt; 1, and makes up the blank of no research on strain crystallization fatigue crack propagation rate and crack propagation length in the prior art.

The invention belongs to the technical field of rock material performance testing, and particularly discloses a convenient-to-use rock material shear performance testing device which comprises a control system, a testing box and a movable base, the testing box is located above the movable base, a stabilizing assembly and a shear applying assembly are arranged in the testing box, and a base is arranged in the testing box; an L-shaped supporting plate is arranged on the base, the L-shaped supporting plate is detachably connected with the shearing applying assembly, the stabilizing assembly is located on the upper portion of the testing box and comprises electric telescopic rods symmetrically arranged on the inner wall of the testing box, and the telescopic ends of the electric telescopic rods are detachably connected with pressing plates. According to the rock material shearing performance testing device convenient to use, the friction force between the supporting plate and the base is reduced in the testing process, the separable pressing plate with the corresponding shape and size can be conveniently replaced according to samples with different shapes and sizes in the shearing testing process of the rock material, the situation that pressure is applied to the whole test piece is avoided, and the testing efficiency is improved. The pure shear performance of the test piece can be obtained.

The invention discloses a 3D printing concrete material shear test mold, and relates to the technical field of test piece shear tests.The 3D printing concrete material shear test mold comprises a fixed supporting piece and a pressing piece, the fixed supporting piece is provided with a containing cavity used for containing a transverse part of a to-be-sheared sample, and the pressing piece and the containing cavity are arranged in a staggered mode; the pressing piece moves towards or away from the fixed supporting piece through the regulation and control mechanism, rolling pieces are rotationally arranged on the opposite faces of the pressing piece and the fixed supporting piece, and a clamping space used for clamping a vertical part of a to-be-sheared sample is formed between the rolling pieces of the pressing piece and the rolling pieces of the fixed supporting piece; the vertical part of the to-be-sheared sample is in rolling contact with the rolling pieces on the two sides; the vertical part of the to-be-sheared sample is stably clamped by the pressing piece and the fixed supporting piece, a pure shear test can be realized, and the vertical part of the to-be-sheared sample is in rolling contact with the pressing piece and the fixed supporting piece, so that the influence of friction force on the shear test is reduced, and the accuracy of a test result is further improved.

The invention discloses a metal single shear sample and clamp for a pure shear stress experiment, and belongs to the technical field of material mechanical property research, the sample is of a cylindrical blocky integrated structure symmetrically provided with two notches in the radial direction, and the sample comprises two loading sections, two transition sections and a test section; the cross section of each loading section is in an arch shape, the two loading sections are oppositely arranged and are symmetrical in the axial direction, and first screw fastening holes are symmetrically formed in the two loading sections in the axial direction; the transition section is a radial bulge structure in the middle of the opposite end surface of the loading section; the testing section is in a square column shape, and the two side faces of the testing section are connected with the two transition sections respectively. The cross section area of the test section is smaller than that of the transition section. Axial compression loads can be applied to the axial end faces of the two loading sections through the bosses on the clamp, so that the test section can form a pure shear stress state in a shear area, and the purpose of researching elasticoplastic deformation and fracture behaviors of a metal material in the pure shear stress state can be achieved.

The utility model relates to a material III-type fracture toughness testing device based on a Hopkinson torsion bar, and relates to the technical field of material dynamic performance testing. Comprising a base, a baffle, an emergent rod, an incident rod, a torsion rod, a torsion limiting device, a hydraulic loading device, a torque loading device and an axial pressure loading device, the axial pressure loading device is mounted on the baffle and connected with the torsion bar, the torsion bar is connected with the incident bar, the emergent bar is mounted on the baffle, and a sample is clamped between the emergent bar and the incident bar; the sample is of a cylindrical structure, and a gap vertically extending towards the outer surface is formed in the center in the sample; the torsion bar penetrates through the torsion limiting device to limit rotation displacement of the torsion bar, and the hydraulic loading device drives the torsion limiting device to relieve rotation limitation on the torsion bar; the torque loading device is in transmission connection with the torsion bar and applies torque to the torsion bar. According to the utility model, the Hopkinson torsion bar loading technology is used, so that the sample is in a pure shear stress state and is subjected to III-type fracture damage, and the accurate test of the III-type fracture toughness of the material can be realized.

A pad assembly having an easily removable / replaceable surface cleaning textile material incorporating low denier fiber constituents held in a hook and loop type engagement with a nonwoven fiber connector pad disposed between the cleaning textile material and a rotating scrubber driver. The surface cleaning textile material contacts the floor during use while the connector pad provides structural integrity and operatively connects to the scrubber driver apparatus. The surface cleaning textile material is held in place across the intermediate connector pad using the gripping behavior between the textile material and an irregular surface of the connector pad. The friction in pure shear is extremely high while the peel strength between the surface cleaning textile material and connector pad may be relatively low to facilitate removal and replacement of the surface cleaning textile material after use.

The present application relates to the technical field of mechanical property testing, and more particularly to a method and system for evaluating the mechanical properties of a laminate based on strain data. The method comprises the following steps: performing a biaxial tensile test on a laminate sample, simultaneously collecting load time history data and full-field speckle images, constructing a full-field strain matrix and discretizing it into nodes using a mapping algorithm, dividing the core pure shear zone and stress diffusion zone, obtaining the first principal strain through principal component analysis, calculating the load transfer efficiency attenuation spectrum and the full-field strain energy entropy density, respectively, combining the preset shape feature parameters to construct a dynamic correction model, and using the model to calculate the correction coefficient to obtain the true constitutive curve by inverting the nominal stress. The introduction of thermodynamic entropy characteristics solves the problem of stress field distortion in the nonlinear damage stage that is difficult to perceive by traditional methods, effectively improving the accuracy of biaxial mechanical property testing of laminates.

The invention provides a method for characterizing a fatigue crack growth rate without digital image processing, and belongs to the field of fatigue crack testing of rubber materials. The method comprises the following steps: firstly, carrying out a tensile test on an unprefabricated crack sample by utilizing a prefabricated crack annular sample (RS), calculating a node tensile force f0 under a pure shear working condition according to a test result, and simulating a quasi-static tensile test of the prefabricated crack sample; according to a simulation result, further calculating to obtain a drawing force scale factor and a distribution function of the drawing force scale factor, the function being determined by two variables of a circumferential radian theta and a crack length c, and the function being integrated to obtain the total drawing force F (c) of the annular sample; and further introducing a force arm value gc as a characteristic value, correcting the characteristic value to obtain corrected values gc and c0, performing a fatigue crack propagation test on the annular sample of the precrack to establish a relationship between gc, c0 and the cycle index N, and finally establishing a relationship between the cycle index N and the crack length c by using gc and c0 to obtain the fatigue crack propagation rate.

The invention provides an annular sample, a clamp and an axial tension pure shear test method, belongs to the field of material mechanical property test, and aims to thoroughly solve the problem of non-uniform pure shear stress field caused by necking phenomenon. Under axial tension, a sample global uniform pure shear stress field is achieved, the pure shear stress-strain relation of the hyperelastic material is directly solved according to force and displacement data of the sample, and the influence of tension displacement and strain is avoided. The mechanical property of the rubber material can be better evaluated. Through verification, an annular sample tensile test has good substitutability for a plane tensile test.

The invention relates to a support structure for components subjected to large loads and torques. The invention particularly relates to a novel elastic bearing which connects large, heavy and moving components of a wind power installation, such as a transmission or a generator, to the power train or the rotor shaft, wherein the active torsional forces can be transmitted by pure shear deformation of the elastic element.

The invention discloses a test device and a test method for masonry rigid core shear loading, and belongs to the technical field of masonry measurement, the test device comprises a loading support, a jack clamping seat is arranged on the loading support, a hydraulic jack is installed at the bottom of the jack clamping seat, the bottom of a piston rod of the hydraulic jack is connected with a movable force transmission cushion block, and the movable force transmission cushion block is connected with a hydraulic cylinder. And the movable force transfer cushion block is connected with the first load transfer steel seat. According to the test device and the test method for masonry rigid core shear loading, the position of the hydraulic jack is changed, so that the action position of an external load can be changed, and the resultant force of the external load acts on the rigid center of a masonry sample, so that the masonry sample is subjected to pure shear damage; the load transfer lower steel seat is fixed on the base through a support bolt, so that the load transfer lower steel seat is convenient to disassemble and replace, and can adapt to different masonry samples.

The embodiment of the application discloses a kind of crack parameter determination method, device and computer storage medium, belong to the technical field of seismic exploration.The method comprises: when receiving the multi-wave seismic data including pure shear wave seismic data, PSV converted wave seismic data and SVP converted wave seismic data by geophone, due to the reverse direction of shear wave source excitation direction caused by the back and forth of seismic source vehicle, therefore, the polarity adjustment processing can be carried out to the shear wave source seismic data therein;Then, according to the seismic data imaging profile corresponding to the multi-wave seismic data, the shear wave splitting analysis time window corresponding to the multi-wave seismic data in each target layer is determined, and the crack parameter of each target layer is determined by the shear wave splitting analysis time window corresponding to the multi-wave seismic data in each target layer.The embodiment of the application carries out shear wave splitting analysis by converted wave and pure shear wave, which guarantees the uniqueness and reliability of crack parameter.

The application discloses a dielectric elastomer film multi-mode stretching device and a stretching method. The dielectric elastomer film multi-mode stretching device comprises a base guide rail, a pure shear stretching module, an equal biaxial stretching module, a uniaxial stretching module and a film fixing module. One of the pure shear stretching module, the equal biaxial stretching module or the uniaxial stretching module is installed on the base guide rail. The film fixing module is assembled on one of the pure shear stretching module, the equal biaxial stretching module or the uniaxial stretching module. The uniaxial stretching module, the pure shear stretching module and the equal biaxial stretching module all comprise a film shearing type stretching assembly. The film shearing type stretching assembly is connected by a shearing type clamping unit. The application realizes effective clamping and uniform stretching of the dielectric elastomer film through the design of the film shearing type stretching assembly, can accurately control the film stretching multiple, and can meet the demand of different stretching modes by replacing different stretching modules.

The invention belongs to the field of material preparation, and particularly relates to a preparation method of an aluminum-based composite material, which is mainly based on a powder metallurgy technology and is characterized in that the aluminum-based composite material is prepared from stainless steel short fibers and pre-alloyed powder through the procedures of ball milling, pressing, extrusion sintering and the like. Through rotation of the mold, the material generates certain pure shear deformation, deformation superposition can refine the structure and crush the original boundary of alloy powder particles, better metallurgical bonding between the particles can be achieved during subsequent sintering, and the purpose of improving the mechanical property of the material is achieved. The density of the Al-xSi-3Cu-0.5 Mg-ySSF composite material reaches 98% or above of the theoretical density, when the mass fraction of Si is 10 wt%, the microhardness and tensile strength of the composite material reach 120 HV and 450 MPa respectively, and important practical value is provided for accelerating and promoting the light weight process of automobiles.

The invention belongs to the technical field of physical and chemical testing, and relates to a high-brittleness random fiber network thermal protection material shear experiment device and method.The method comprises the steps that firstly, after a sample is wrapped with an isolation pad, the sample is placed in a fixed clamp assembly and a sliding clamp assembly, and an initial gap between the fixed clamp assembly and the sliding clamp assembly is accurately set through a gap gasket; then, the load applying end of the testing machine control box pushes the sliding clamp assembly to generate displacement, shear load is applied to the sample, and the whole process is monitored in real time by the computer terminal and shear force and displacement data are recorded. Stress concentration generated during clamping of the clamp is effectively buffered through the isolation pad, and a sample is prevented from being damaged in advance in a non-shearing area; the clearance gasket is matched with the relative movement of the fixed / sliding clamp assembly, so that the load is ensured to act on the sample in a pure shearing form; the modularized clamp design is compatible with different sample shapes and shearing modes, so that the universality of the method and the accuracy and reliability of a test result are remarkably improved.

This disclosure provides a method, apparatus, device, and storage medium for shear wave splitting correction of pure shear waves, belonging to the field of seismic exploration technology. The method includes: acquiring fracture direction information of the strata in the area to be measured; and acquiring first pure shear wave data received by a target geophone in the area; when the fracture direction information is used to indicate a fixed fracture direction, determining the fast and slow shear waves corresponding to the first pure shear wave data based on the fracture direction information; determining the time difference between the fast and slow shear waves; correcting the slow shear wave based on the time difference to obtain a corrected slow shear wave; and determining the first corrected shear wave field corresponding to the first pure shear wave data based on the fracture direction information, the fast shear wave, and the corrected slow shear wave. Because the slow shear wave is corrected using the time difference, a shear wave field after removing azimuth anisotropy is obtained, thereby eliminating the influence of anisotropy and improving the accuracy of the determined first corrected shear wave field.

The invention discloses a rubber mount fatigue crack propagation analysis method and a fatigue life prediction method, and belongs to the technical field of rubber mounts. The method comprises the following steps: acquiring rubber parameters required by simulation for manufacturing the rubber suspension, and performing a fatigue test on a crack propagation testing machine by using a rubber pure shear sample with a single-side notch to obtain critical tearing energy; a rubber suspension finite element model is constructed through an Abaqus finite element method, and a local fatigue dangerous point area of the rubber suspension is analyzed and determined; the relation between the precrack propagation and the rubber suspension rigidity is obtained by establishing a precrack model and performing simulation analysis on the rubber precrack propagation.

The invention relates to a clamp for testing the adhesive property of a rubber roller interface under a calendaring working condition and a testing method. The clamp comprises a base, a supporting structure, a heating and clamping structure, a water supply structure and a driving structure, the supporting structures are arranged on the two sides of the base and provided with a rotatable rubber roller to be detected. The heating and clamping structure is provided with a plurality of pairs of arc-shaped clamping jaws with a heating function, containing grooves are formed in the inner sides of each pair of clamping jaws, and the clamping jaws can move in opposite directions to clamp a rubber roller; the rubber roller comprises a metal pipe with a cooling flow channel and an outer rubber layer, the rubber layer is matched with the containing groove, the water supply structure introduces cooling liquid into the cooling flow channel, and the driving structure is connected with the rubber roller through the torque detection unit and detects a torque peak value. The interface shearing process is simulated more truly; meanwhile, a heating clamping jaw and internal cooling are adopted for cooperative temperature control, the temperature gradient under the calendaring working condition is accurately simulated, and the test accuracy and the working condition simulation authenticity are improved.

The application provides a pre-stack fast-slow pure transverse wave separation method and device, and belongs to the technical field of seismic exploration. A first kind of observation pre-stack pure transverse wave four-component seismic data is rotated in a direction, then separated-azimuth stacking or separated-azimuth migration stacking is performed, a second kind of observation separated-azimuth stacking pure transverse wave four-component seismic data which is convenient for analyzing transverse wave splitting characteristics is formed, then a target crack direction is obtained, fast-slow transverse wave separation is performed on the second kind of observation separated-azimuth stacking pure transverse wave four-component seismic data according to the target crack direction, a judging matrix is combined, whether the target crack direction changes with depth is judged, then fast-slow transverse wave separation is performed on seismic data, so that the pre-stack fast-slow pure transverse wave separation of transverse wave data is performed, the precision of fast-slow wave separation is improved, the pre-stack migration calculation amount of two-component seismic data except fast transverse wave and slow transverse wave is reduced, and the velocity of fast transverse wave and the velocity of slow transverse wave are conveniently adjusted subsequently.

The invention discloses a device for testing the bonding characteristic of an outer-layer fiber material and a wall interface, which comprises a concentric-square-shaped loading block, the concentric-square-shaped loading block is provided with a T-shaped groove, a T-shaped connecting rod is arranged in the T-shaped groove, a loading rod is fixedly arranged at the bottom of the T-shaped groove, one end of the loading rod extends out of the T-shaped groove, the loading rod is connected with a fiber through a support plate, and the T-shaped connecting rod is connected with the T-shaped groove. The fiber is connected with the wall body, the reserved steel bar is connected to the wall body, the lower clamp of the loading tester clamps the reserved steel bar in the wall body, and the upper clamp clamps the T-shaped connecting rod. According to the device for testing the bonding property of the outer-layer fiber material and the wall interface, the bonding property test in a pure shearing mode and a shearing and stripping mixed mode can be carried out by changing the included angle theta, the testing device is simplified, and the consumption of a wall base material is reduced.

The utility model discloses a clamp device suitable for a shear resistance test of a connection node of an iron-based shape memory alloy plate and a to-be-reinforced structure, which comprises an upper clamping piece (1) and a lower clamping piece (2), one side of the upper clamping piece (1) is slotted, the lower clamping piece (2) is connected with a square plate (8), the upper clamping piece (1) and the lower clamping piece (2) are matched and connected through a nut (5) and a screw (7), and a triangular stiffening rib (9) is fixedly connected between the square plate (8) and the lower clamping piece (2). By adopting the clamp device, the influence of loading eccentricity on a node single shear test can be effectively reduced, and a connection interface is ensured to be in a pure shear state. The clamp device is easy to manufacture and convenient to operate, can be applied to a single shear test between a to-be-reinforced structure and an Fe-SMA plate in various connection modes such as structural adhesives and bolts, and can be repeatedly used. The method is simple, convenient and efficient.

The application discloses a kind of in-situ testing methods of material shear stress under double-beam system, it is related to shear stress testing technical field, comprising the following steps: step one, with electron beam perspective analysis sample block, with ion beam imaging to determine processing area;Step two, ion beam processing microblock topography;Step three, mechanical hand assisted microblock extraction and finishing;Step four, with ion beam deposition microblock;Step five, ion beam processing shear sample;Step six, with electron beam perspective carries out pure shear test.The application provides a kind of method for determining critical shear stress on micro-nano scale to specific structure metal material, provides important support for regulating metal material plastic deformation.