95 results about "Pure shear" patented technology

The invention relates to a device and a method for testing mechanical property of a hyper-elastic material. The device mainly comprises a reinforcing piece (4) at the end of a test piece and a test piece clamp, wherein the reinforcing piece (4) has a trapezoidal cross section; a clamping port of the clamp is an inclined surface; the reinforcing piece (4) is adhered to the end of the test piece and is arranged in the clamp, the inclined surface of the clamp tightly clamps the inclined surface of the reinforcing piece (4), and the clamp is self-locked in the tensioning process and is prevented from locally deforming. The device is applied to multiple stress-strain tests of the hyper-elastic material such as uniaxial tension, equally biaxial tension and planar tension (pure shear). Stress data is acquired by a data acquisition system of an electronic universal testing machine, and the strain data is acquired by a charge coupled device (CCD) image acquisition device. Due to the technical scheme, the clamping force is high when the tension is high in the process of tensioning the test piece, so that the test piece is uniformly stressed, more accurate testing data can be obtained, and the mechanical property parameters of the hyper-elastic material obtained accordingly are more reliable.

The invention discloses a multifunctional shearing test fixture used for composite material parameter identification. The multifunctional shearing test fixture comprises an upper fixture body and a lower fixture body, wherein the upper fixture body is connected with a loading part of a testing machine; the lower fixture body is connected with a supporting platform of the testing machine; the upper fixture body is the same as the lower fixture body in structure and in central symmetry with the lower fixture body; each of the upper fixture body and the lower fixture body comprises a connecting piece (1), a clamping piece (5) and a clamping mechanism; the connecting pieces (1) are connected with the testing machine and the clamping pieces (5); each clamping piece (5) is divided into an upper part and a lower part; the upper parts are connected with the connecting pieces (1) and an angle limiting mechanism is arranged at the upper part; the lower parts and the clamping mechanisms are jointly used for clamping a test piece; the clamping mechanisms comprise regulating parts and compressing pieces (6); the compressing pieces (6) are connected with the clamping pieces (5) through an adjusting mechanism; a limiting mechanism is arranged on the clamping piece (5) and used for limiting positions of the compressing pieces to enable the compressing pieces to perform movement along set tracks. The multifunctional shearing test fixture has the advantages of being light in weight, simple in operation and easy to dissemble and capable of realizing pure shear, tension-shear and tension-shear combined loading.

A rock specimen, including a rock body. The rock body includes: an upper part, an upper end face, a first circular groove, a first cylinder, a first circular body, a lower part, a lower end face, a second circular groove, a second cylinder, and a second circular body. The first circular groove is disposed on the upper end face of the rock body and has a circle center coinciding with a center of the upper end face. A method for testing pure shear of the rock specimen, includes: 1) disposing the rock specimen on a test bench of a rock mechanics testing system, allowing the end face of the second circular body to contact the test bench; and 2) operating the rock mechanics testing system, loading a pressure on the rock specimen via the end face of the first cylinder and the end face of the second circular body.

The invention relates to a method and a device for detecting the compression strength of concrete by an anti-shearing method. The method comprises the following steps of: calculating anti-shearing strength by recording the anti-shearing load and the area of a broken fracture surface when the concrete is broken; and building a correlated relationship according to the anti-shearing strength and the strength of a corresponding cubic test piece with the edge length of 150mm, so that the compression strength of the concrete is presumed. The influence factor during testing can be reduced by applying pure shear force to a test component, the test precision can be improved, and the test process is simple and easy. The method and the device can be widely used for detecting the solid strength of concrete structures in the industries such as building, railway, traffic, water transport, harborwork and the like.

The invention belongs to the technical field of composites and relates to a composite interlaminar shear performance testing method. The testing method comprises two steps, namely the preparation of a test piece and the preparation of a testing device. In the step of preparing the test piece in the testing method disclosed by the invention, a common ply splicing and laying technology of a composite laminated plate is utilized, thus the operation is convenient, and the precision is high. When the manufacturing of the composite laminated plate is completed, the manufacturing of the test piece is completed, thus a fine processing link of the test piece is reduced, and the cost can be reduced by above 70%. The interlaminar shear testing method is simple to operate; and by adopting the interlaminar shear testing method, the damages of the test piece between designated tested layers can be ensured, the generation of pure shear damages between the tested layers can be ensured, the composite interlaminar shear performance can be precisely tested, and the testing method is suitable for composite laminated structures in various thicknesses.

The invention provides a testing device for a shear-resistant fatigue property of a chemical anchoring stud. The testing device comprises a fatigue tester transverse beam (2) and a fatigue tester pedestal (3), wherein the fatigue tester transverse beam (2) is connected with the fatigue tester pedestal (3) by fatigue tester uprights (1), and a fixture assembly guaranteeing a pure shear stress state of the stud during a fatigue test is arranged between the fatigue tester transverse beam (2) and the fatigue tester pedestal (3). The testing device is reasonable in design, simple in structure and easy to operate and use; a T-shaped flange is arranged, and connected by a bolt, so that the testing device can be matched with testers in multiple specifications for use; and an application scope of the testing device is wider.

The invention relates to a processing method for improving the drawing and pressing asymmetry of magnesium alloy. The method comprises the steps of homogenizing a magnesium alloy rod or pipe; and then, with the axis of the rod or pipe as a rotating center, carrying out clockwise and/or anticlockwise torsional deformation. Crystals are rotated and twinborn because the magnesium alloy rod or pipe is under the action of a pure shear stress through repeated torsional deformation, the volume fractions of produced twin crystals are also in gradient distribution from edges to a central part due to different deformation degrees of a sample from the central parts to the edges on a cross section, and the crystal orientation distribution of the sample can be greatly changed due to the twin crystals, so that the texture of a basal plane can be effectively regulated, and the drawing and pressing asymmetry of magnesium alloy is mainly weakened on the aspect of the texture of the basal plane. The method is reasonable in technological design, simple in equipment requirements, convenient to operate, low in cost, low in energy consumption and high in efficiency, the strength of magnesium alloy is increased, and the drawing and pressing asymmetry problem of magnesium alloy is also greatly improved, and the method has a good industrial application prospect.

The invention discloses a device and method for preparing fine grains through electroplastic variable-section corner extrusion. The device comprises a die and an extrusion rod, and further comprises a power-up device, and a cylinder die cavity and a circular truncated cone die cavity are arranged in the die; and the cylinder die cavity is communicated with the circular truncated cone die cavity, and a corner is formed by connecting positions of the cylinder die cavity and the circular truncated cone die cavity. According to the device, the cylinder die cavity and the circular truncated cone die cavity are combined, pure shear deformation of an extruded workpiece and heading deformation of the extruded workpiece are combined, so that the grain refinement efficiency and homogeneity of the extruded workpiece are improved; and in addition, pure shear deformation and heading deformation defects such as easily-occurring cracks, easily-occurring heave types and surface defects disappear in the deformation process. Meanwhile, currents are applied to the extruded workpiece and will generate joule heat when flowing through the die and the extruded workpiece, the metal plasticity will also be improved through the heat, and the time of heating needed for thermal deformation of the workpiece can be shortened.

The invention discloses a thin film bulk acoustic resonance biochemical sensor with annular electrodes. The sensor comprises an upper electrode, a lower electrode, a piezoelectric thin film and a sound isolating layer, wherein the upper electrode has a ring shape comprising an inner layer and an outer layer which are concentric and consists of an inner layer solid circle and an outer layer hollow ring; the lower electrode has a hollow ring shape which is concentric with that of the upper electrode; and the upper electrode and the lower electrode are not superposed in the vertical direction of the rings. The thin film bulk acoustic resonance biochemical sensor approximate to a pure shear wave mode is acquired by the technical scheme, and the sensibility in liquid is greatly improved.

The invention relates to a novel experimental device in the field of hydraulic and civil engineering and particularly relates to a pure-shearing experimental device for new and old concrete bonding interfaces. The pure-shearing experimental device comprises an upper L-shaped clamp, a lower L-shaped clamp, bolts, a side-surface chuck, a concrete test piece, an experimental machine base, an experimental machine pressing head, screws and a spring. The novel experimental device has the advantages that the size is small, the preparation is simple, the use is convenient, the assembly and the disassembly are convenient, the pure-shearing experiment can be carried out on the new and old concrete bonding interfaces under the pure-shearing condition, the shearing strength of the new and old concrete bonding interfaces under the pure-shearing action can be tested, the shearing stress performance of a new reinforced concrete structure can be analyzed, the shearing strength parameter of the bonding interfaces is provided and can be used as the mechanical property index for the reinforcement and restoration design of the concrete structure, and simultaneously technical guidance is provided for treating the new and old concrete bonding interfaces in concrete reinforcement construction.

The invention discloses a device for testing the shear strength of a joint of an external prestressing prefabrication and assembly concrete member. The device disclosed by the invention is characterized in that a first segment of the concrete member is arranged on a support, a hydraulic jack is loaded on the upper end face of a second segment of the concrete member; the cross section of the first segment of the concrete member is of an L shape, the cross section of the second segment of the concrete member is of an inverted L shape, the first segment of the concrete member and the second segment of the concrete member are assembled into a vertical joint, an upper horizontal plane joint and a lower horizontal plant joint by virtue of an external prestressing tension device, the upper horizontal plane joint and the lower horizontal plane joint are respectively connected with at least one vertically arranged displacement sensor in a bridging manner, and the vertical joint is connected with one group of displacement sensors horizontally arranged in a bridging manner; and the center connecting line of the support and the hydraulic jack is coincided with that of the vertical joint. The device disclosed by the invention has the advantages that the bending moment of a loaded concrete member can be avoided, pure shear loading is realized, the displacement sensors are arranged at the joint, double control on loading is carried out by virtue of a force and displacements, and the loading failure time can be timely known, so that the device disclosed by the invention has certain safety.

The invention discloses a test device for testing the shearing performance, and relates to the technical field of shearing performance testing. The test device for testing the shearing performance comprises a clamp, a connecting joint and a loading joint, the clamp is detachably connected with the edge of a test piece, a load is applied along a first diagonal line of the test piece through the clamp, the connecting joint and the loading joint are arranged on two corners corresponding to the first diagonal line, one end of the connecting joint is hinged with the clamp, the other end of the connecting rod is hinged with the loading joint, and the loading joint is hinged with a testing machine. According to the test device for testing the shearing performance, the connecting joint is hinged with the clamp and the loading joint, so that the load transmission is clear, the test load of near-pure shearing can be provided for the test piece, and the high-precision test loading is realized.

The invention discloses a pure-shear loading device and method for a tubular product. A first core shaft penetrates into a first half pipe; a second core shaft penetrates into a second half pipe; thesize of the first core shaft is matched with the size of the first half pipe; the size of the second core shaft is matched with the size of the second half pipe; a first connection part of the first core shaft and a second connection part of the second core shaft are loaded; a first protruding part and a second protruding part are used for transmitting a force to a tubular product to be detected,so that a material, which is located on the same plane of a right plane or a left plane of the first half pipe and the left plane or the right plane of the second half pipe, on a whole pipe is at a pure-shear stress state. The pure-shear loading device disclosed by the invention is simple in structure; the first core shaft and the second core shaft, which have special designs, are used for inhibiting the rotation of the tubular product to be detected, which is difficult to control, in a shear deformation process; and the material, which is located on the same plane of the right plane or the left plane of the first half pipe and the left plane or the right plane of the second half pipe, on the whole pipe can be at the stable pure-shear stress state in a whole deformation process.

The invention provides a method for measuring a coefficient of normal anisortopy and a yield stress of a pipe in any direction, and belongs to the field of pipe performance test. The method comprisesthe following steps of step 1, carrying out a bidirectional pipe loading experiment to obtain stress and strain experimental data of the pipe under a plurality of bidirectional stress states; step 2,preparing a pipe shear sample, and acquiring shear stress and strain experimental data under a pipe pure shear stress state; step 3, calculating a stress value and/or a plastic strain increment ratioof the pipe under different stress states of a bidirectional loading and pure shear experiment when the same plastic work is reached, and determining all coefficients in a yield function and a plasticpotential function of the pipe; step 4, establishing an expression for measuring the yield stress of the pipe direction and the coefficient of normal anisotropy; step 5, giving an angle, and obtaining values of the yield stress and the coefficient of normal anisotropy of the pipe direction; and step 6, changing the angle to obtain the values of the yield stress and the coefficient of normal anisotropy of the pipe in any direction. The method provided by the invention is used for measuring the coefficient of normal anisotropy and the yield stress of the pipe in any direction.

The invention discloses a T-joint shear testing device, and belongs to the technical field of testing of the shearing strength of a material. Support plates are arranged on the two sides of a base, supporting clamping plates are symmetrically arranged above the base, a sample is arranged between the supporting clamping plates, a pressing head is transversely arranged above the supporting clampingplates, a base sliding chute is formed in the base, a supporting clamping plate sliding chute is arranged on the lower side of the supporting clamping plate, the base sliding chute and the supportingclamping plate sliding chute correspond in position, a tightening handle penetrates through the supporting clamping plate sliding chute and the base sliding chute to connect the base and the supporting clamping plate; a locating cushion block is further arranged at the upper part of the base; web samples with different thicknesses in a T-joint are met through the distance adjustment of the supporting clamping plate, so that the universality of the testing device is improved; in addition, the clamping mode of the clamping plate guarantees that the loading pressing head applies a pure shear loadonto the sample in the vertical direction, no additional bending moment is produced on the sample in the test process, and the reliability of the shear test is improved.

The invention belongs to the technical field of bridges and building structures, and provides a double-curved-surface spherical seismic mitigation and absorption supporting base with a limiting device easy to replace. The double-curved-surface spherical seismic mitigation and absorption supporting base with the limiting device easy to replace comprises an upper base plate (6), a middle base plate (4) and a lower base plate (1). The end of the upper base plate (6) is provided with the limiting device corresponding to the lower base plate. The limiting device is composed of a pressing plate (9) and a limiting plate (10). The pressing plate (9) and the upper base plate (6) are combined in an embedded mode and are connected into a whole through an anti-draw screw II (13). The limiting plate is connected with the pressing plate (9) through an anti-draw screw I (12) and an anti-shear pin (11). The anti-draw screw I (12) is close to the lower base plate (1). The anti-shear pin (11) is far away from the lower base plate (1). The double-curved-surface spherical seismic mitigation and absorption supporting base ensures that the anti-shear pin bears the pure shear effect rather than bending moment effect on the horizontal force effect, and has the advantages of being easy to operate and facilitating replacement.

The invention discloses a testing device for small-span high-ratio connecting beam pure shear loading, and belongs to the technical field of testing loading devices. The testing device comprises a loading frame part, an active loading part, a rotary limiting part, a connecting beam test piece part and an auxiliary loading part. The loading frame part is composed of an L-shaped steel frame and a side square roller. One end of the side square roller is fixed to a portal type counterforce frame, and the other end of the side square roller ejects the L-shaped steel frame through a roller. The active loading part is composed of an actuator, a loading head, a converting steel plate and high-strength screws. The actuator and the loading head are connected with the L-shaped steel frame through thehigh-strength screws. The rotary limiting part is composed of eight connecting rods, two transverse beams, a support cushion plate and a support. The connecting rods are connected with the L-shaped steel frame, a bottom beam and the transverse beams through the support cushion plate, the support, pins and high-strength bolts. The connecting beam test piece part is composed of a connecting beam and two concrete end blocks and is arranged between the L-shaped steel frame and the bottom beam. The auxiliary loading part is composed of the bottom beam, a jack and a pressing beam. A test piece is connected with the bottom beam and the L-shaped steel frame through high-strength screws. The testing device is simple in structure and convenient to use and detach, and pure shear displacement can beexerted on the small-span high-ratio connecting beam.

Circularly polarized resonant structures are obtained utilizing piezoelectric resonators made of materials and orientations selected in accordance with the teaching provided herewith. Further provided are radially polarized structures. Furthermore, the utilization of such resonators and structures as sensors, for frequency control application, for signal filtering, and the like, is also disclosed.

The invention provides a pure shear fatigue test device for a metal web plate, comprising a square metal web plate provided with four chamfer parts and a clamp assebly, wherein the metal web plate comprises a central region and a peripheral region, and the thickness of the peripheral region is greater than the thickness of the central region; and the clamp assembly comprises two clamps for clamping the metal web plate, and each clamp comprises two draw plates arranged mutually in parallel along the horizontal direction, a loading single ear arranged between the two draw plates and fixed to one side of the two draw plates, and a first clamp plate and a second clamp plate arranged between the two draw plates and fixed to the other side of the two draw plates. The device can reduce the damaged probability of a non-fatigue examined detailed part, and completely meets the design requirements of a test for allowable values of a fatigue sheared plate.

The invention provides a pipe circumferential pure shearing loading method and device, and relates to the technical field of pipe mechanical property testing. According to the technical scheme, the method includes the steps that a notch is machined in a to-be-detected pipe in advance, a connecting part is reserved, and a core shaft is arranged to prevent the side wall of the pipe from being twisted and deformed inwards in a twisting process; and then opposite torsional force in the circumferential direction of the pipe is applied to the first edge and the second edge through a torsion device,the upper pipe is twisted relative to the lower pipe, a plurality of anti-deformation surfaces are further arranged on the torsion device, and each anti-deformation surface is respectively propped against the other edges, except the first edge and the second edge, of the first notch and the second notch so as to prevent the other edges from deforming when the upper pipe and the lower pipe are twisted. According to the invention, the pipe circumferential pure shearing loading method and device provided by the invention can enable the to-be-detected pipe to be always in a stable circumferentialpure shearing loading state in the torsional deformation process when the to-be-detected pipe is subjected to torsional shearing.

The invention discloses a pure shear test loading device for boards, and belongs to the technical field of board mechanics performance testing. The device comprises a board test-piece, a front loadingdevice and a rear loading device; the board test-piece is arranged between the front loading device and the rear loading device; a front loading device locating hole is formed in a front connection torsion testing machine area; a front upper shear force applying step and a front lower shear force applying step are arranged on the locating plane of the front loading device; a rear upper shear force applying step and a rear lower shear force applying step are arranged on the locating plane of the rear loading device; and a loading device locating pin is arranged at the center position in the front loading device locating hole. According to the device provided by the invention, via the special relative positions set by the front and rear loading devices, the accurate conversion relation between the shear stress and the load torque can be acquired, and thus the accurate board pure shear test stress-strain relation can be acquired. According to the loading mode, the board can be completelysheared under the pure shear condition.

The invention discloses a dynamic simple shear apparatus of a servo cylinder-driven cubic articulated mechanism. The dynamic simple shear apparatus comprises a main machine part, a loading mechanism, and a measurement signal collecting and processing mechanism, wherein the main machine part is a core for applying a load to a sample; the loading mechanism comprises a vertical loading mechanism and a horizontal loading mechanism; the measurement signal collecting and processing mechanism is used for automatically controlling deformation, load signal input and sensor signal output. The device disclosed by the invention improves the structure of the existing dynamic simple shear apparatuses, and is simple and convenient to use and operate; a plurality of actual loading conditions of the scene can be simply and accurately simulated under the condition of pure shear deformation, so that the dynamic simple shear apparatus is suitable for researching a plurality of dynamics problems of rock-soil, such as geological process, and can directly research the relations between dynamic shear stress and dynamic shear strain under drainage and non-drainage conditions. In addition, the power cycle function also can be used for researching the damping ratio and the liquefaction characteristics.