CN112748000B - Multi-axis testing machine and testing method for testing performance of carbon fiber composite material - Google Patents
Multi-axis testing machine and testing method for testing performance of carbon fiber composite material Download PDFInfo
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- CN112748000B CN112748000B CN202110127553.3A CN202110127553A CN112748000B CN 112748000 B CN112748000 B CN 112748000B CN 202110127553 A CN202110127553 A CN 202110127553A CN 112748000 B CN112748000 B CN 112748000B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention provides a multi-axis testing machine and a testing method for testing the performance of a carbon fiber composite material, which are characterized in that: the device comprises a Stewart parallel mechanism with a moving platform, a portal vertical frame and two centering clamping devices, wherein each centering clamping device is provided with a sample chuck, the portal vertical frame comprises a base, two stand columns, an upper beam and a T-shaped moving frame, the T-shaped moving frame comprises a transverse connecting arm and a longitudinal extending arm, and two ends of the transverse connecting arm are respectively movably sleeved on the two stand columns and are fixed in position by connecting pieces. The Stewart parallel mechanism is arranged on the base, and a centering clamping device is arranged on the moving platform and moves in a three-dimensional space; the other centering clamping device is arranged on a longitudinal extending arm of the T-shaped moving frame and moves up and down along with the longitudinal extending arm. The mechanical test of the carbon fiber composite material in various axial directions and various loading modes can be carried out in a plurality of spatial degrees of freedom, and the problems in the prior art are solved.
Description
Technical Field
The invention belongs to the technical field of material testing equipment, and relates to a material performance testing machine, in particular to a multi-axis testing machine and a testing method for testing the performance of a carbon fiber composite material.
Background
The mechanical properties of the material are the main basis for designing the selected materials of various engineering structures, and the mechanical properties are measured according to specified test methods and test equipment. The material testing machine is mainly used for testing the mechanical properties of metal or nonmetal materials under external loads such as tension, compression, bending, torsion, shearing and the like. Thereby evaluating the mechanical properties, the processing properties and the presence or absence of internal defects of the material.
Most of the material testing machines on the current market can only test the mechanical property of the material in a single axial direction.
Carbon fiber composite materials have been widely used in the fields of aviation, aerospace, vehicles, construction, ships and the like due to their advantages of light weight, large specific strength-to-rigidity, corrosion resistance and the like. At present, carbon fiber composite materials are increasingly used in load-bearing structures, the stress conditions of the carbon fiber composite materials are increasingly complex, the carbon fiber composite materials are anisotropic materials, the influence of fiber angles and the layering sequence on the material performance is great, the mechanical performance of the carbon fiber composite materials is not completely verified only by carrying out a uniaxial mechanical performance test on the carbon fiber composite materials, the mechanical performance test under multiaxial load needs to be carried out, and the application of the existing material testing machine cannot be met.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a multi-axis testing machine and a testing method for testing the performance of a carbon fiber composite material, which have strong bearing capacity and can move in a plurality of degrees of freedom in space and mechanically test the carbon fiber composite material in various axial directions and various loading modes.
The purpose of the invention is realized by the following technical scheme:
a multi-axis testing machine for testing mechanical properties of carbon fiber composite materials is characterized by comprising a Stewart parallel mechanism with a moving platform, a door type vertical frame and two centering clamping devices, wherein each centering clamping device is provided with a sample chuck; the Stewart parallel mechanism is arranged on the base, one centering clamping device is arranged on a moving platform of the Stewart parallel mechanism and moves along with the moving platform in a three-dimensional space, and the other centering clamping device is arranged on a longitudinal extending arm of the T-shaped moving frame and moves up and down along with the T-shaped moving frame.
The improvement of the technical scheme is as follows: the connecting piece include adjusting stud and set nut, the vertical centre bore that sets up in the middle of the upper beam, the lower extreme of adjusting stud is installed on the T type removes the frame, the upper end of adjusting stud passes the centre bore of upper beam, and with set nut fastening position.
The technical scheme is further improved as follows: the centering clamping device comprises a horizontal guide rail, a screw rod, sliding blocks, V-shaped clamping claws and positioning bolts, wherein the two sliding blocks are symmetrically arranged at two ends of the horizontal guide rail, the rotation directions of threads at two ends of the screw rod are opposite, the screw rod penetrates through screw holes in the two sliding blocks, and one end of the screw rod is provided with a handle; the openings of the two V-shaped clamping jaws are oppositely and respectively arranged on the inner sides of the two sliding blocks; mounting plates are respectively arranged on two sides of the horizontal guide rail, and the two centering clamping devices are respectively fixed on the moving platform of the Stewart parallel mechanism and the longitudinal extending arm of the T-shaped moving frame through the mounting plates.
The technical scheme is further improved as follows: the horizontal guide rail is provided with a separated shaft sleeve, the separated shaft sleeve is positioned between the two sliding blocks and fixed on the horizontal guide rail by positioning bolts, and the screw rod between the two sliding blocks is arranged in the separated shaft sleeve.
The technical scheme is further improved as follows: the sample chuck comprises L-shaped clamping plates, clamping bolts and wedge blocks, the back surfaces of vertical plates of the two L-shaped clamping plates are oppositely arranged, a through hole is formed in the vertical plate of one L-shaped clamping plate, a screw hole corresponding to the through hole is formed in the vertical plate of the other L-shaped clamping plate, and the clamping bolts penetrate through the through hole and are screwed into the screw holes; a groove is arranged in the middle of the L-shaped clamping plate 4.1, the wedge block is embedded in the groove, the surface of the wedge block slightly protrudes out of the groove, and the exposed surface of the wedge block is a sawtooth surface; the bottom plate tip of L type clamp plate be provided with the arch that the V type groove of V type jack catch matches, L type clamp plate passes through the arch is installed the V type inslot of V type jack catch.
The technical scheme is further improved as follows: the Stewart parallel mechanism further comprises a static platform, 6 actuators, spherical hinges, force sensors and a controller, wherein the static platform is in a regular triangle shape, three corners of the static platform are respectively provided with a screw hole, the bottom ends and the top ends of the 6 actuators are respectively provided with the spherical hinges, and two bottom ends of the actuators are fixed on the three corners of the static platform in a group; the top ends of the 6 actuators are respectively connected with a force sensor, the 6 force sensors are uniformly distributed and fixed on the same circumference of the bottom surface of the moving platform, and the static platform of the Stewart parallel mechanism is fixed on the base of the portal vertical frame.
The technical scheme is further improved as follows: the actuators are composed of hydraulic cylinders, oil circuit switching valves of the hydraulic cylinders are connected to controllers of Stewart parallel mechanisms, the Stewart parallel mechanisms are in initial position states, the lengths of the 6 actuators are equal, and the moving platform is in a horizontal position.
The test method of the multi-axis tester for testing the mechanical property of the carbon fiber composite material is characterized by comprising the following steps of:
the method comprises the following steps: and two ends of the test piece are respectively arranged between the wedge blocks of the upper and lower sample chucks, the clamping bolt is screwed down to firmly fix the test piece clamp, and the strain gauge is bonded on the test piece which is not clamped between the two sample chucks.
Step two: adjusting the position of the Stewart parallel mechanism to an initial position: the lengths of the 6 actuators are equal, so that the mobile platform is ensured to be in a horizontal position; then, the position of the T-shaped moving frame is heightened through an adjusting stud on the portal type vertical frame; a sample chuck with a test piece is arranged on the centering clamping device on the moving platform, and the sliding block moves towards the middle by rotating the handle, so that the sample chuck is firmly fixed on the centering clamping device on the moving platform.
Step three: the T-shaped moving frame is adjusted downwards to a proper position, and the positioning nut is screwed down to fix the T-shaped moving frame; mounting the other sample chuck with the test piece on a centering clamping device on the T-shaped moving frame, and firmly fixing the sample chuck by rotating a handle; then, the height of the T-shaped movable frame is adjusted again, so that the test piece is in a state of being basically straightened but not being pulled.
Step four: and connecting the output end of the strain gauge to a controller of a Stewart parallel mechanism, and carrying out single-axis or multi-axis loading on the test piece by the controller of the Stewart parallel mechanism.
Step five: and calculating the load of the test piece in the test process according to the data measured by the 6 force sensors, and obtaining the strain of the test piece in the test process according to the strain test module.
The invention has the advantages and positive effects that:
1. according to the invention, by introducing a Stewart parallel mechanism and constructing a clamping mechanism consisting of a portal vertical frame, a centering clamping device and a sample chuck, the mechanical test of a material test piece under various loading modes with strong bearing capacity and capability of moving in multiple degrees of freedom in space is realized.
2. The Stewart parallel mechanism adopted by the invention has the characteristics of high rigidity, high precision, strong bearing capacity, no accumulated position error and the like, can move in six degrees of freedom in space, and can realize various loading modes for a material test piece. The Stewart parallel mechanism adopts a hydraulic loading mode, has light weight, small volume, small movement inertia and high reaction speed, can carry out stepless speed regulation in a large range, and realizes different loading rates on a test piece. The problem that the existing material testing machine cannot apply force in multiple shafts is solved.
3. The invention can be set as the multiaxial testing machine used for testing the mechanical property of the carbon fiber composite material of the vertical structure or the horizontal structure, the test sample also includes: metals, non-metals, and other polymer composites.
Drawings
FIG. 1 is a schematic structural diagram of a multi-axis testing machine for mechanical property testing of carbon fiber composite materials according to the present invention;
FIG. 2 is a schematic structural diagram of a portal stand in a multi-axis testing machine for testing mechanical properties of carbon fiber composites according to the present invention;
FIG. 3 is a schematic structural diagram of a centering and clamping device in a multi-axis testing machine for testing mechanical properties of carbon fiber composites according to the present invention;
FIG. 4 is a schematic structural diagram of a sample chuck in a multi-axis testing machine for testing mechanical properties of carbon fiber composite materials according to the present invention;
FIG. 5 is a schematic structural diagram of a Stewart parallel mechanism in a multi-axis testing machine for testing mechanical properties of a carbon fiber composite material, provided by the invention;
FIG. 6 is a front view of a Stewart parallel mechanism in a multi-axis testing machine for testing mechanical properties of carbon fiber composite materials.
The numbering in the figure is: 1-Stewart parallel mechanism, 1.1-static platform, 1.2-actuator, 1.2.1-first actuator, 1.2.2-second actuator, 1.2.3-third actuator, 1.2.4-fourth actuator, 1.2.5-fifth actuator, 1.2.6-sixth actuator, 1.3-ball hinge, 1.4-force sensor, 1.5-moving platform, 2-door type vertical frame, 2.1-bottom plate, 2.2-upright post, 2.3-T type moving frame, 2.4-upper beam, 2.5-adjusting stud, 2.6-positioning nut, 3-centering clamping device, 3.1-horizontal guide rail, 3.2-screw rod, 3.3-handle, 3.4-slide block, 3.5-V type claw, 3.6-separating type shaft sleeve, 3.7-positioning bolt, 3.8-mounting plate, 4-clamping device, 4.1-L type clamping plate, 1.2-L type clamping plate, 4.2-clamping bolt, 4.3-wedge.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1-6, an embodiment of a multi-axis testing machine for mechanical property testing of carbon fiber composite materials according to the present invention includes a Stewart parallel mechanism 1 having a moving platform 1.5, a portal stand 2, and two centering clamping devices 3, wherein each centering clamping device 3 is provided with 1 sample chuck 4. The door type vertical frame 2 comprises a base 2.1 at the bottom, two upright posts 2.2 vertically arranged on the base 2.1, an upper beam 2.4 connected with the upper ends of the two upright posts 2.2 and a T-shaped movable frame 2.3, wherein the T-shaped movable frame 2.3 comprises a transverse connecting arm and a longitudinal extension arm, and the two ends of the transverse connecting arm are respectively movably sleeved on the two upright posts 2.2 and are fixedly positioned by connecting pieces. The Stewart parallel mechanism is arranged on a base 2.1, one centering clamping device 3 is arranged on a moving platform 1.5 of the Stewart parallel mechanism and moves in a three-dimensional space along with the moving platform 1.5, and the other centering clamping device 3 is arranged on a longitudinal extending arm of the T-shaped moving frame 2.3 and moves up and down along with the T-shaped moving frame 2.3.
Specifically, the method comprises the following steps: the connecting piece comprises an adjusting stud 2.5 and a positioning nut 2.6, a center hole is vertically formed in the middle of the upper beam 2.4, the lower end of the adjusting stud 2.5 is installed on the T-shaped moving frame 2.3, and the upper end of the adjusting stud 2.5 penetrates through the center hole of the upper beam 2.4 and is fastened and positioned by the positioning nut 2.6.
The centering clamping device 3 comprises a horizontal guide rail 3.1, a screw rod 3.2, sliders 3.4, V-shaped clamping jaws 3.5 and positioning bolts 3.7, the two sliders 3.4 are symmetrically arranged at two ends of the horizontal guide rail 3.1, the thread rotating directions of two ends of the screw rod 3.2 are opposite, the screw rod 3.2 is penetrated into screw holes in the two sliders 3.4, the two sliders 3.4 can move towards the middle by rotating the screw rod 3.2, and a handle 3.3 is arranged at one end of the screw rod 3.2, so that the screw rod 3.2 can be conveniently rotated. Two V type jack catch 3.5 openings are installed at two slider 3.4 inboards relatively respectively, and V type jack catch 3.5 is used for fixed sample chuck 4. Mounting plates 3.8 are respectively arranged on two sides of the horizontal guide rail 3.1, and the two centering clamping devices 3 are respectively fixed on a moving platform 1.5 of the Stewart parallel mechanism 1 and a longitudinal extending arm of the T-shaped moving frame 2.3 through the mounting plates 3.8.
Furthermore, a separate shaft sleeve 3.6 is arranged on the horizontal guide rail 3.1, the separate shaft sleeve 3.6 is positioned between the two slide blocks 3.4 and fixed on the horizontal guide rail 3.1 by a positioning bolt 3.7, and a screw rod 3.2 between the two slide blocks 3.4 is arranged in the separate shaft sleeve 3.6. The separating type shaft sleeve 3.6 is favorable for preventing the screw rod 3.2 from bending deformation, and the influence on the test result caused by the fluctuation of the stress of the sample due to the vertical jumping of the V-shaped clamping jaw 3.5 is avoided.
Still further, the sample chuck 4 comprises an L-shaped clamping plate 4.1, a clamping bolt 4.2 and a wedge 4.3, wherein the L-shaped clamping plate 4.1 is formed by connecting the bottom edge of a vertical plate with one end of a bottom plate. The back faces of the vertical plates of the two L-shaped clamping plates 4.1 are oppositely arranged, a through hole is formed in the vertical plate of one L-shaped clamping plate 4.1, a screw hole corresponding to the through hole is formed in the vertical plate of the other L-shaped clamping plate 4.1, and the clamping bolt 4.2 penetrates through the through hole and is screwed into the screw hole. A groove is formed in the middle of the L-shaped clamping plate 4.1, the wedge block 4.3 is embedded in the groove, the surface of the wedge block 4.3 slightly protrudes out of the groove, and the exposed surface of the wedge block 4.3 is a sawtooth surface, so that friction force between the wedge block and a sample is increased, and the clamping of the sample is facilitated to be firm. The end part of the bottom plate of the L-shaped clamping plate 4.1 is provided with a bulge matched with the V-shaped groove of the V-shaped clamping jaw 3.5, and the L-shaped clamping plate 4.1 is arranged in the V-shaped groove of the V-shaped clamping jaw 3.5 through the bulge at the end part of the bottom plate.
Still further, the Stewart parallel mechanism further comprises a static platform 1.1, 6 actuators 1.2 (a first actuator 1.21, a second actuator 1.22, a third actuator 1.23, a fourth actuator 1.24, a fifth actuator 1.25 and a sixth actuator 1.26), ball hinges 1.3, force sensors 1.4 and a controller, wherein the static platform 1.1 is a regular triangle, three corners of the static platform 1.1 are respectively provided with a screw hole, the bottom ends and the top ends of the 6 actuators 1.2 are respectively provided with the ball hinges 1.3, and two bottom ends of each actuator 1.2 are fixed on three corners of the static platform 1.1 in a group; the top ends of the 6 actuators 1.2 are respectively connected with a force sensor 1.4, the 6 force sensors 1.4 are uniformly distributed and fixed on the same circumference of the bottom surface of the movable platform 1.5, the static platform 1.1 of the Stewart parallel mechanism is fixed on the base 2.1 of the door type vertical frame 2, each actuator 1.2 is composed of a hydraulic cylinder, an oil circuit conversion valve of each hydraulic cylinder is connected to a controller of the Stewart parallel mechanism, the Stewart parallel mechanism is in an initial position state, the 6 actuators 1.2 are equal in length, and the movable platform 1.5 is in a horizontal position.
The multi-axis testing machine for the mechanical performance test of the carbon fiber composite material shown in fig. 1 and fig. 2 is of a vertical structure, and the multi-axis testing machine for the mechanical performance test of the carbon fiber composite material of the vertical structure can be made into a horizontal structure by rotating the multi-axis testing machine for the mechanical performance test of the carbon fiber composite material by 90 degrees in the left direction or the right direction. The sample of the vertical structure or horizontal structure multi-axis testing machine for testing the mechanical properties of the carbon fiber composite material further comprises: metals, non-metals, and other polymer composites.
Referring to fig. 1 to 6, an embodiment of the testing method of the multi-axis testing machine for testing mechanical properties of carbon fiber composite materials of the present invention includes the following steps:
the method comprises the following steps: the two ends of the test piece are respectively arranged between the wedge blocks 4.3 of the upper and lower sample chucks 4, the clamping bolt 4.2 is screwed down to firmly fix the test piece clamp, and the strain gauge is bonded on the test piece which is not clamped between the two sample chucks 4.
Step two: the position of the Stewart parallel mechanism 1 is adjusted to the initial position: the lengths of the 6 actuators 1.2 are equal, so that the moving platform 1.5 is ensured to be in a horizontal position; then, the position of a T-shaped moving frame 2.3 is adjusted to be high through an adjusting stud 2.5 on the door type vertical frame 2; a sample chuck 4 with a test piece is arranged on the centering clamping device 3 on the movable platform 1.5, the slide block 3.4 moves towards the middle by rotating the handle 3.3, and the sample chuck 4 is firmly fixed on the centering clamping device 3 on the movable platform 1.5.
Step three: the T-shaped moving frame 2.3 is adjusted downwards to a proper position, and the positioning nut 2.6 is screwed down to fix the T-shaped moving frame 2.3; another sample chuck 4 with a test piece is arranged on a centering clamping device 3 on a T-shaped moving frame 2.3, and the sample chuck 4 is firmly fixed by rotating a handle 3.3; the height of the T-shaped mobile frame 2.3 is then adjusted again so that the test piece is in a substantially straightened but unstretched state.
Step four: referring to fig. 6, the output end of the strain gauge is connected to the controller of the Stewart parallel mechanism 1, and the test piece is subjected to single-axis or multi-axis loading through the controller of the Stewart parallel mechanism 1.
For example:
the compression or the stretching of the carbon fiber composite material test piece is realized by controlling the common extension or contraction of the first actuator 1.21, the second actuator 1.22, the third actuator 1.23, the fourth actuator 1.24, the fifth actuator 1.25 and the sixth actuator 1.26;
the second actuator 1.22, the third actuator 1.23 and the sixth actuator 1.26 are controlled to extend, and the first actuator 1.21, the fourth actuator 1.24 and the fifth actuator 1.25 are controlled to shorten properly, so that the moving platform 1.5 rotates horizontally, and the torsion load is applied to the test piece;
controlling the elongation of the second actuator 1.22 and the actuator 1.25, and controlling the appropriate shortening of the actuators 1.21, 1.23, 1.24 and 1.26, wherein the shortening of the first actuator 1.21 and the sixth actuator 1.26 are the same, the shortening of the third actuator 1.23 and the fourth actuator 1.24 are the same, and the shortening of the third actuator 1.23 and the fourth actuator 1.24 is slightly larger than the shortening of the first actuator 1.21 and the sixth actuator 1.26; through controlling the length change of the six actuators, the composite loading of the test piece can be realized.
Step five: and calculating the load of the test piece in the test process according to the data measured by the 6 force sensors 1.4, and obtaining the strain of the test piece in the test process according to the strain test module.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (3)
1. A multi-axis testing machine for testing mechanical properties of carbon fiber composite materials is characterized by comprising a Stewart parallel mechanism with a moving platform, a door type vertical frame and two centering clamping devices, wherein each centering clamping device is provided with a sample chuck; the Stewart parallel mechanism is arranged on the base, one centering clamping device is arranged on a moving platform of the Stewart parallel mechanism and moves along with the moving platform in a three-dimensional space, and the other centering clamping device is arranged on a longitudinal extending arm of the T-shaped moving frame and moves up and down along with the T-shaped moving frame; the centering clamping device comprises a horizontal guide rail, a screw rod, sliding blocks, V-shaped clamping claws and positioning bolts, wherein the two sliding blocks are symmetrically arranged at two ends of the horizontal guide rail, the rotation directions of threads at two ends of the screw rod are opposite, the screw rod penetrates through screw holes in the two sliding blocks, and one end of the screw rod is provided with a handle; the openings of the two V-shaped clamping jaws are oppositely and respectively arranged on the inner sides of the two sliding blocks; mounting plates are respectively arranged on two sides of the horizontal guide rail, and the two centering clamping devices are respectively fixed on a moving platform of the Stewart parallel mechanism and a longitudinal extending arm of the T-shaped moving frame through the mounting plates; a separate shaft sleeve is arranged on the horizontal guide rail, the separate shaft sleeve is positioned between the two sliding blocks and is fixed on the horizontal guide rail by a positioning bolt, and the screw rod between the two sliding blocks is arranged in the separate shaft sleeve; the sample chuck comprises L-shaped clamping plates, clamping bolts and wedge blocks, the back surfaces of vertical plates of the two L-shaped clamping plates are oppositely arranged, a through hole is formed in the vertical plate of one L-shaped clamping plate, a screw hole corresponding to the through hole is formed in the vertical plate of the other L-shaped clamping plate, and the clamping bolts penetrate through the through hole and are screwed into the screw holes; a groove is arranged in the middle of the L-shaped clamping plate 4.1, the wedge block is embedded in the groove, the surface of the wedge block slightly protrudes out of the groove, and the exposed surface of the wedge block is a sawtooth surface; the end part of the bottom plate of the L-shaped clamping plate is provided with a bulge matched with the V-shaped groove of the V-shaped clamping jaw, and the L-shaped clamping plate is arranged in the V-shaped groove of the V-shaped clamping jaw through the bulge; the Stewart parallel mechanism comprises a static platform, 6 actuators, spherical hinges, a force sensor, a moving platform and a controller, wherein the static platform is in a regular triangle shape, three corners of the static platform are respectively provided with a screw hole, the bottom ends and the top ends of the 6 actuators are respectively provided with the spherical hinges, and two bottom ends of the actuators are fixed on the three corners of the static platform in a group; the top ends of the 6 actuators are respectively connected with a force sensor, the 6 force sensors are uniformly distributed and fixed on the same circumference of the bottom surface of the moving platform, and the static platform of the Stewart parallel mechanism is fixed on the base of the portal vertical frame; the actuators are composed of hydraulic cylinders, oil circuit switching valves of the hydraulic cylinders are connected to controllers of Stewart parallel mechanisms, the Stewart parallel mechanisms are in initial position states, the lengths of the 6 actuators are equal, and the moving platform is in a horizontal position.
2. The multi-axis testing machine for the mechanical property test of the carbon fiber composite material as claimed in claim 1, wherein the connecting member comprises an adjusting stud and a positioning nut, a central hole is vertically arranged in the middle of the upper beam, the lower end of the adjusting stud is installed on the T-shaped moving frame, and the upper end of the adjusting stud penetrates through the central hole of the upper beam and is fastened and positioned by the positioning nut.
3. A test method of the multi-axis tester for mechanical property test of carbon fiber composite material as claimed in claim 1 or 2, characterized by comprising the steps of:
the method comprises the following steps: placing two ends of a test piece between wedge blocks of an upper sample chuck and a lower sample chuck respectively, screwing a clamping bolt to firmly fix a test piece clamp, and bonding a strain gauge on the test piece which is not clamped between the two sample chucks;
step two: adjusting the position of the Stewart parallel mechanism to an initial position: the lengths of the 6 actuators are equal, so that the mobile platform is ensured to be in a horizontal position; then, the position of the T-shaped moving frame is heightened through an adjusting stud on the portal type vertical frame; a sample chuck with a test piece is arranged on a centering clamping device on a moving platform, and a handle is rotated to enable a sliding block to move towards the middle, so that the sample chuck is firmly fixed on the centering clamping device on the moving platform;
step three: the T-shaped moving frame is adjusted downwards to a proper position, and the positioning nut is screwed down to fix the T-shaped moving frame; mounting the other sample chuck with the test piece on a centering clamping device on the T-shaped moving frame, and firmly fixing the sample chuck by rotating a handle; then, adjusting the height of the T-shaped moving frame again to enable the test piece to be in a state of being basically straightened but not being pulled;
step four: connecting the output end of the strain gauge to a controller of a Stewart parallel mechanism, and carrying out single-axis or multi-axis loading on the test piece through the controller of the Stewart parallel mechanism;
step five: and calculating the load of the test piece in the test process according to the data measured by the 6 force sensors, and obtaining the strain of the test piece in the test process according to the strain test module.
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| CN115326549B (en) * | 2022-10-17 | 2022-12-09 | 新亚新智能科技(南通)有限公司 | Testing machine for testing performance of carbon fiber composite material |
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| CN200986505Y (en) * | 2006-12-12 | 2007-12-05 | 深圳市新三思材料检测有限公司 | Multi-shaft split control multifunctional test machine |
| CN100449196C (en) * | 2006-12-30 | 2009-01-07 | 浙江大学 | Master-slave mode two-in-parallel twelve degree of freedom generalized force adjustment loading mechanism |
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| CN110587516B (en) * | 2019-09-20 | 2020-07-31 | 燕山大学 | Thermal simulation testing machine sample loading clamp capable of realizing centering of multi-section materials and operation method |
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2021
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