CN111595699B - Straight wallboard compression shear test device - Google Patents

Straight wallboard compression shear test device Download PDF

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Publication number
CN111595699B
CN111595699B CN202010561095.XA CN202010561095A CN111595699B CN 111595699 B CN111595699 B CN 111595699B CN 202010561095 A CN202010561095 A CN 202010561095A CN 111595699 B CN111595699 B CN 111595699B
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assembly
test piece
hinged
rod
load
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CN111595699A (en
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柴亚南
李崇
陈丽敏
高敏
林亮亮
王彬文
刘西林
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AVIC Aircraft Strength Research Institute
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AVIC Aircraft Strength Research Institute
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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
    • G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
    • 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
    • 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
    • G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12—Pressure testing
    • 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
    • G01N2203/0014—Type of force applied
    • G01N2203/0016—Tensile or compressive
    • G01N2203/0019—Compressive
    • 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
    • G01N2203/0014—Type of force applied
    • G01N2203/0025—Shearing
    • 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
    • G01N2203/0014—Type of force applied
    • G01N2203/0026—Combination of several types of applied forces
    • 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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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
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  • Pathology (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The application belongs to aircraft strength test technical research field, in particular to straight wallboard compression shear test device, include: the compression load applying assembly comprises a base, a top beam, a compression actuating cylinder connected with an upper pressing platform and two support lugs; a test piece assembly comprising a test piece and a plurality of side loading joints; the shear load applying assembly comprises a cross beam assembly, a left upright post assembly and a right upright post assembly, wherein the left upright post assembly and the right upright post assembly are arranged on two sides of the cross beam assembly and are used for applying shear loads; a support assembly including interconnecting cross beams and straight beams; an anti-destabilization assembly includes a long rod disposed on a longitudinal beam. The application of compression and shear load is completely independently opened, the compression or shear load and the compression-shear combined load of any proportion can be applied, the end parts of the frame or the rib of the test piece are restrained, the real boundary condition is simulated, the anti-instability device is additionally arranged, and the free edges on the two sides can be effectively prevented from being damaged in advance.

Description

Straight wallboard compression shear test device
Technical Field
The application belongs to the technical field of aircraft strength test, in particular to a straight wallboard compression shear test device.
Background
Stiffened panels are structural forms widely used in aircraft construction, such as wing panels, tail panel wing panels, spar panels, fuselage panels, and the like. As a primary load bearing member of aircraft structures, stiffened panel structures typically require consideration of stability under the combined effects of multiple loads. In the whole building block type test verification process, a wallboard level test occupies a large proportion, a stiffened wallboard with curvature is generally simplified into a straight wallboard to carry out tests such as strength research, shape selection, parameter selection, verification and the like, and compression and shearing are main load forms for verifying the stability of the stiffened wallboard.
However, some existing test methods or devices have at least the following disadvantages:
1. the bending and twisting combined loading is carried out on the box section, so that the design and manufacturing cost of the test piece is high.
2. The device is only suitable for plane light plates or flat plates with negligible rib height, and the loading proportion of compression and shear loads cannot be adjusted at will.
3. Rather than completely separate the compression and shear application systems, the actuators that apply the compression and shear loads are fixed to a single integral frame so that the two loads interfere with each other. The actuating cylinder or the load sharing device can contain a small amount of gas, when the shearing loads on the two side edges are passively loaded through the load sharing device, the displacement of a piston rod of the load sharing device is large, the displacement of a frame is large finally, and the loading precision is difficult to guarantee. When the wall plate is loaded, the real boundary state is simulated as much as possible, and the prior device can not realize the support of the simulation to the frame edge. When a compression load is applied, the free edges on the two sides directly participate in the loading, although the loading joint is arranged, the local rigidity can be only increased, the free edges are unstable before the assessment area, the determination of the initial buckling load of the assessment area is further influenced, and the free edges are easily damaged in advance.
Disclosure of Invention
In order to solve at least one of the above technical problems, the present application provides a flat panel compression shear test apparatus.
The application discloses flat wallboard compression shear test device, apply the subassembly, shear load and apply subassembly, support the subassembly and prevent unstability subassembly including test piece subassembly, compressive load, wherein
The compressive load applying assembly includes:
the base is fixedly arranged on the horizontal mounting surface;
the top beam is fixedly arranged at the top of the base in parallel through at least four round stand columns, and a test space is formed between the bottom surface of the top beam and the top surface of the base;
the short beam is fixedly arranged at the top of the base;
the transfer beam is fixedly arranged at the top of the short beam;
the top end of the compression actuating cylinder is hinged to the bottom of the top beam, and a first load sensor is arranged at the bottom of the compression actuating cylinder;
the top end of the upper pressing platform is hinged to the bottom of the first load sensor;
the two supporting single lugs are fixedly arranged at the top of the base and symmetrically arranged at two sides of the short beam;
the test piece assembly includes:
the pressing beam is fixedly arranged at the top of the transfer beam;
the test piece is vertically arranged between the pressing beam and the upper pressing table, and the bottom of the test piece is fixed with the top of the pressing beam;
the side loading joints are fixedly arranged at the left side and the right side of the test piece, and each side loading joint is provided with a loading shaft capable of rotating around the axis of the side loading joint;
the shear load applying assembly comprises:
the middle part of each beam assembly is hinged with one supporting single lug, and a support rod assembly is arranged between the end parts of the left end and the right end of each beam assembly and the horizontal mounting surface;
the bottom of the left upright post assembly is hinged to the left end parts of the two cross beam assemblies and is used for applying shear load to the test piece through the side loading joint on the left side;
the bottom of the right upright post assembly is hinged to the right end parts of the two cross beam assemblies and is used for applying shear load to the test piece through the side loading joint on the right side;
the support component includes:
the cross beam is horizontally arranged on two adjacent round stand columns and is parallel to the surface of the test piece;
the straight beam is movably arranged on the cross beam and is used for supporting the test piece from the side;
the anti-destabilization assembly includes:
the top beam cross beam is horizontally arranged on two adjacent round stand columns and is parallel to the surface of the test piece;
the test piece ejector rod cross beam is horizontally arranged on two adjacent round stand columns and is parallel to the surface of the test piece;
the two longitudinal beams, the top beam cross beam and the test piece ejector rod cross beam form a groined structure;
and the long rods are vertical to the surface of the test piece, one end of each long rod is arranged on the longitudinal beam in a sliding mode along the vertical direction, and the other end of each long rod is connected with the side loading connector.
According to at least one embodiment of the present application, the compressive load applying assembly further comprises:
the compression actuating cylinder is fixedly arranged at the bottom of the top beam, and the top end of the compression actuating cylinder is hinged to the base single lug;
and the top end of the ball hinge connecting piece is fixedly connected with the bottom of the first load sensor, and the bottom end of the ball hinge connecting piece is fixedly connected with the upper pressing table.
According to at least one embodiment of the present application, the beam assembly includes:
the crossbeam, the crossbeam middle part seted up with support the recess of monaural shape looks adaptation, the crossbeam passes through the recess cover and establishes support on the monaural to through run through simultaneously at the middle part the crossbeam is connected with the crossbeam pivot of supporting the monaural, the crossbeam pivot with be provided with roller bearing between the crossbeam.
According to at least one embodiment of the present application, the brace bar assembly comprises:
the screw base communicated with the bottom is vertically arranged on the horizontal mounting surface, and the top of the screw is provided with a handle;
and the anti-shearing supporting seat is fixedly arranged at the end parts of the left end and the right end of the cross beam and is provided with a threaded hole matched with the lead screw.
According to at least one embodiment of the present application, the left pillar assembly includes a left pillar front half and a left pillar rear half, the left pillar front half including:
the top and the bottom of the two front transition beams are respectively and fixedly connected through an upper connecting block and a lower connecting block;
the two front edge beams are respectively and fixedly arranged on two sides of the two front transition beams, and the bottoms of the two front edge beams are respectively hinged to the left end parts of the two cross beam assemblies through the front edge beam single ears;
the left upright post rear half includes:
the rear middle beam is parallel to the two front transition beams;
the two rear edge beams are respectively and fixedly arranged on two sides of the rear middle beam, and the bottom parts of the two rear edge beams are respectively hinged to the left end parts of the two cross beam assemblies through rear edge beam lugs;
the left upright post assembly further comprises:
the two rotary supporting plates are arranged between the two front transition beams at intervals in parallel;
the middle part of the curved lever is rotatably arranged between the two rotating support plates through a rotating shaft, the number and the position of the curved lever are matched with those of the loading shafts on the side loading joints on the corresponding side, and one end of the curved lever is used for driving the loading shafts;
the number of the load sharing devices is the same as that of the curved levers, one end of each load sharing device is hinged to the rear middle beam, and the other end of each load sharing device is provided with a second load sensor and is hinged to the other end of the corresponding curved lever;
the transverse pull rods are horizontally arranged between the front edge beam and the rear edge beam on the same side, the same side comprises at least two transverse pull rods, and the end parts of the two ends of each transverse pull rod are respectively hinged with the front edge beam and the rear edge beam;
the diagonal draw bar is obliquely arranged between the front edge beam and the rear edge beam on the same side with the horizontal plane, and the end parts of the two ends of the diagonal draw bar are respectively hinged with the front edge beam and the rear edge beam;
the back side beam lug is hinged to the bottom of the back side beam;
one end of the pull rod assembly is hinged to the anti-shearing supporting seat at the left end, and the other end of the pull rod assembly is hinged to the back side beam lug.
According to at least one embodiment of the present application, the test piece assembly further comprises:
the two pull plates are fixedly clamped at the top of the test piece and extend along the horizontal direction;
the left upright post assembly further comprises:
the T-shaped groove base is fixedly arranged on the rear middle beam along the vertical direction;
one end of the rear single lug of the sensor is arranged in the T-shaped groove base in a sliding manner;
one end of the third load sensor is hinged with the rear single lug of the sensor, and the other end of the third load sensor is hinged with the two pull plates through the front single lug of the sensor;
the counterweight beam is horizontally and fixedly provided with the rear middle beam and the top of the upper connecting block, and a fixed pulley is arranged on the counterweight beam;
and the counterweight part is connected to the top of the front single ear of the sensor by a steel wire rope penetrating through the fixed pulley.
According to at least one embodiment of the present application, the right pillar assembly includes a right pillar front half and a right pillar rear half, the right pillar front half including:
the top and the bottom of the two front transition beams are respectively and fixedly connected through an upper connecting block and a lower connecting block;
the two front edge beams are respectively and fixedly arranged on two sides of the two front transition beams, and the bottoms of the two front edge beams are respectively hinged to the right end parts of the two cross beam assemblies through the front edge beam single ears;
the right pillar back half includes:
the rear middle beam is parallel to the two front transition beams;
the two rear edge beams are respectively and fixedly arranged on two sides of the rear middle beam, and the bottom parts of the two rear edge beams are respectively hinged to the right end parts of the two cross beam assemblies through rear edge beam lugs;
the right upright post assembly further comprises:
the two rotary supporting plates are arranged between the two front transition beams at intervals in parallel;
the middle part of the curved lever is rotatably arranged between the two rotating support plates through a rotating shaft, the number and the position of the curved lever are matched with those of the loading shafts on the side loading joints on the corresponding side, and one end of the curved lever is used for driving the loading shafts and is driven in the opposite direction to the curved lever in the right upright post assembly;
the number of the load sharing devices is the same as that of the curved levers, one end of each load sharing device is hinged to the rear middle beam, and the other end of each load sharing device is provided with a second load sensor and is hinged to the other end of the corresponding curved lever;
the transverse pull rods are horizontally arranged between the front edge beam and the rear edge beam on the same side, the same side comprises at least two transverse pull rods, and the end parts of the two ends of each transverse pull rod are respectively hinged with the front edge beam and the rear edge beam;
the diagonal draw bar is obliquely arranged between the front edge beam and the rear edge beam on the same side with the horizontal plane, and the end parts of the two ends of the diagonal draw bar are respectively hinged with the front edge beam and the rear edge beam;
the back side beam lug is hinged to the bottom of the back side beam;
one end of the pull rod assembly is hinged to the anti-shearing supporting seat at the right end, and the other end of the pull rod assembly is hinged to the back side beam lug.
According to at least one embodiment of the present application, the support component further comprises:
the guide rail is horizontally fixed on the cross beam;
the low gravity center sliding block is arranged on the guide rail in a sliding manner;
sliding support, one end with low gravity center slider fixed connection, the other end is provided with U type opening, be provided with vertical cylinder guide rail in the U type opening, be provided with the slider on the cylinder guide rail, just slider bottom cylinder guide rail is gone up to overlap and is equipped with the spring, wherein
One end of the straight beam is fixedly connected with the sliding block, the other end of the straight beam is connected with a rib connecting plate, and the rib connecting plate is fixedly connected with the test piece.
According to at least one embodiment of the present application, the anti-destabilization assembly further comprises:
the two ends of the longitudinal beam are slidably arranged in the strip-shaped holes through double-end studs;
a clamping groove is formed in the longitudinal beam along the vertical direction;
one end of each cylindrical double lug is slidably arranged in the clamping groove;
the device comprises a single lug of the strip rod cylinder and two lugs of the strip rod cylinder, wherein one end of the long rod is hinged to the other ends of the two lugs of the cylinder through the single lug of the strip rod cylinder, the other end of the long rod is hinged to a single lug connecting piece through the two lugs of the strip rod cylinder, and the single lug connecting piece is connected with a side loading joint on the corresponding side.
According to at least one embodiment of the present application, the flat panel compression shear test apparatus further comprises a positioning assembly, the positioning assembly comprising:
the pressing table ejector rod cross beam is horizontally arranged on two adjacent round stand columns, is parallel to the surface of the test piece, is positioned at the top of the test piece ejector rod cross beam, and is provided with a rectangular internal thread facing the test piece at the center line of the pressing table ejector rod cross beam;
the screw rod ejector rod is arranged in the rectangular internal thread in an adaptive mode, an end part, close to the test piece, of the screw rod ejector rod is provided with an ejector bead, and an end part, far away from the test piece, of the screw rod ejector rod is provided with a hand wheel;
the end parts of the two ends of the pressure table ejector rod longitudinal beam are respectively and fixedly connected to the two pressure table ejector rod cross beams positioned on the two sides of the plane direction of the test piece, and a rectangular internal thread is formed in the center line of the pressure table ejector rod longitudinal beam and faces the test piece;
the short screw rod is arranged in the rectangular internal thread of the pressing table ejector rod longitudinal beam in an adaptive mode, and a hand wheel is arranged at the end portion, far away from the test piece, of one end of the short screw rod.
The application has at least the following beneficial technical effects:
the application of compression and shear load is completely independent, independent compression or shear load and the compression-shear composite load of any proportion can be applied, the end parts of the frame or the rib of the test piece are restrained, a real boundary condition is simulated, an anti-instability device is additionally arranged, and the free edges on two sides can be effectively prevented from being damaged in advance.
Drawings
FIG. 1 is a schematic (front view) of the overall structure of the present application;
FIG. 2 is a schematic view of the overall structure of the present application (rear view);
FIG. 3 is a schematic view of a test piece assembly according to the present application;
FIG. 4 is a schematic structural view of the compressive load applying assembly of the present application from one perspective;
FIG. 5 is a schematic structural view of another perspective of the compressive load applying assembly of the present application;
FIG. 6 is a schematic view of the bottom surface of the lower header in the compressive load applying assembly of the present application;
FIG. 7 is a schematic structural view of a shear load applying assembly of the present application;
FIG. 8 is a perspective view of a left column assembly at one viewing angle of the flat panel compression shear test apparatus of the present application;
FIG. 9 is a perspective view of the left upright assembly from another perspective of the flat panel compression shear test apparatus of the present application;
FIG. 10 is a perspective view of the right stud assembly of the flat panel compression shear test apparatus of the present application;
FIG. 11 is a view of the inner structure (front view) of the right column assembly of the flat panel compression shear test apparatus of the present application;
FIG. 12 is a schematic structural view of a beam assembly in the flat panel compression shear test apparatus of the present application;
FIG. 13 is a schematic view of the shear load applying assembly and test piece assembly of the present application in connection therewith;
FIG. 14 is a schematic view of the support assembly of the present application in connection with a test piece assembly and a compressive load applying assembly;
FIG. 15 is a schematic structural diagram of a support assembly in the flat panel compression shear test apparatus according to the present application;
FIG. 16 is a schematic structural view of an anti-buckling assembly in the flat panel compression shear test apparatus of the present application;
FIG. 17 is a schematic view of the anti-buckling assembly and the testing assembly of the present application;
FIG. 18 is a schematic view of a positioning assembly in the flat panel compression shear test apparatus of the present application;
FIG. 19 is a schematic view of a positioning beam assembly of a pressing table in the flat panel compression shear test apparatus of the present application;
FIG. 20 is a schematic view of a transverse positioning assembly of a pressing table in the flat panel compression shear test apparatus according to the present application;
FIG. 21 is a schematic view of a test piece end positioning assembly in the flat panel compression shear test apparatus of the present application.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are a subset of the embodiments in the present application and not all embodiments in the present application. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
It should be understood that technical terms such as "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., which may be referred to in the description of the present application, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the scope of the present application.
The flat panel shear test apparatus of the present application will be described in further detail with reference to fig. 1 to 21.
The application discloses flat wallboard compression-shear test device, as shown in fig. 1 and 2, comprises a test piece assembly 1, a compression load applying assembly 2, a shear load applying assembly 3, a frame/rib supporting assembly 4 and an anti-instability assembly 5.
Specifically, as shown in fig. 3, the test piece assembly 1 includes a pressing beam 101, and the pressing beam 101 is fixedly disposed on the top of the transfer beam 204; the test piece 107 is vertically arranged between the press beam 101 and the upper press table 220, and the bottom of the test piece is fixed with the top of the press beam 101 through two bottom side angle pieces 102; a plurality of side loading joints 106 are fixedly arranged on two sides of the test piece 107, every two side loading joints 106 are in a group and are connected with the side of the test piece 107 through bolts, a loading shaft 103 penetrates through a loading hole of each side loading joint 106 and is locked by a round nut 105, and a needle bearing 104 is arranged on the loading shaft 103 (so that the loading shaft 103 can rotate around the axis of the loading shaft) and is used for applying shear load to each pair of loading joint combinations and reducing friction force; in addition, the top of the test piece 107 is bolted to two pull plates 108 for applying shear force to the upper end.
As shown in fig. 4 to 6, the compressive load applying assembly 2 includes a lower base 201, and the base 201 is fixedly disposed on a horizontal mounting surface; the short beam 203 is fixed on the top of the base 201 through a hinged hole bolt; the transfer beam 204 is fixed on the top of the short beam 203 through a hinged hole bolt; wherein, the bottom of the test piece assembly 1 is connected with the transfer beam 204 through a hinged hole bolt.
The two supporting single lugs 205 of the compressive load applying component 2 are respectively fixed on the top of the base 201 through hinged hole bolts, the two supporting single lugs 205 are symmetrically arranged at two sides of the short beam (203), and the central hole axes of the two supporting single lugs 205 are required to be collinear; the supporting lug 205 serves to support the beam assembly 303 in the shear load application assembly 3 for rotation about the concentric holes of the two lugs.
Further, a plurality of circular columns 206 are installed between the top beam 207 and the base 201 of the compressive load applying assembly 2, and in this embodiment, four columns 206 are preferred; the upper end and the lower end of each upright post 206 are respectively connected with the top beam 207 and the base 201 by a cylindrical fixing seat 202.
In addition, a loading device is arranged at the lower end of the top beam 207; specifically, as shown in fig. 5, the base monaural 209 is fixed on the top beam 207 through four bolts, the holes for connecting the top beam 207 and the base monaural 209 are respectively vertical slotted holes, the positioning frame 210 is fixed on the top beam, and the position of the base monaural can be adjusted by using the ejector rod 213; as shown in fig. 6, the ball 212 and the ball socket 211 are installed at the front end of the push rod 213, so that the friction force when adjusting the other direction can be reduced after adjusting the position in one direction.
Further, the lifting eye screw 208 is used as a hanging point for auxiliary installation, the compression actuating cylinder 214 is used for applying a compression load, two lugs at the rear end of the compression actuating cylinder 214 are hinged with a single lug of the base, the first load sensor 215 is connected with a piston rod of the compression actuating cylinder 214 and is connected with the compression extension piece 216 and the spherical pressure head 217 in sequence from bottom to top, wherein the compression extension piece 216 can be processed into any length to adapt to test pieces with different height sizes; the spherical pressure head 217 is in spherical fit with the spherical base 219, the inner side of the cover plate 218 is also spherical (namely the spherical pressure head 217, the spherical base 219 and the cover plate 218 form a spherical hinge connecting piece), and the spherical pressure head 217, the spherical base 219 and the spherical pressure head 217 are fixed on the spherical base 219 by four bolts, so that the spherical base 219 and the spherical pressure head 217 are matched and do not fall off due to gravity; further, an upper pressing table 220 is connected to the spherical base 219 for applying a compressive load to the test piece 107, and the upper pressing table 220 has a certain thickness to ensure that the compressive load is uniformly applied to the upper surface of the test piece 107.
As shown in fig. 7, the shear load application assembly 3 comprises a left column assembly 301, a right column assembly 302 and a cross beam assembly 303, and the shear load application assembly 3 can integrally rotate around the central hole axis of the supporting single lug 205. Wherein the bottom portions of the left and right upright assemblies 301 and 302 are hinged to the left and right end portions of the two cross beam assemblies 303, respectively, for applying shear load to the test piece 107 through the left and right side loading joints 106.
Specifically, as shown in fig. 8 and 9, the left pillar assembly 301 includes a left pillar front half and a left pillar rear half;
wherein, the left upright column front half part comprises two front boundary beams 301b, 2 front transition beams 301x, an upper connecting block 301w, a lower connecting block 301ab and 2 rotating support plates 301y which are connected with each other through bolts. Specifically, two front transition beams 301x are vertically and parallelly arranged at intervals, and the tops and the bottoms of the two front transition beams 301x are respectively and fixedly connected through an upper connecting block 301w and a lower connecting block 301 ab; the two front edge beams 301b are respectively fixedly arranged at two sides of the two front transition beams 301x, and the bottoms of the two front edge beams 301b are respectively hinged to the left end parts of the two cross beam assemblies 303 through the front edge beam lugs 301 h. Furthermore, two rotating support plates 301y are arranged between the two front transition beams 301x in parallel at intervals, 2 top pipes 301z are arranged between the two rotating support plates 301y, the lower end of the front beam 301b is hinged with the front beam single lug 301h, and the front beam single lug 301h is fixed on the T-shaped groove of the cross beam 303 a.
The rear half part of the left upright post comprises two rear side beams 301r, a rear middle beam 301s and a T-shaped groove base 301ag which are connected with each other through bolts; the lower end of the rear side rail 301r is hinged to the rear side rail lug 301m, and the rear side rail lug 301m is also fixed to the T-shaped slot of the cross rail 303 a. The front part and the rear part of the left upright post assembly 301 form a whole through 4 cross rods 301a and 2 diagonal draw bars 301c, wherein the cross rods 301a are horizontally arranged between the front side beam 301b and the rear side beam 301r on the same side, the same side comprises at least two cross rods, and the end parts of the two ends of each cross rod 301a are respectively hinged with the front side beam 301b and the rear side beam 301 r; the diagonal draw bar 301c is obliquely arranged between the front edge beam 301b and the rear edge beam 301r on the same side with the horizontal plane, and the end parts of the two ends are respectively hinged with the front edge beam 301b and the rear edge beam 301 r; the structure has the advantages that the internal structure can be clearly seen, the loading safety is improved, and meanwhile, the equipment is biased to be maintained.
Further, the left column assembly 301 may include other components besides the above components, for example, a plurality of load balancing device assemblies are installed inside the assembly, the specific number is determined according to the height of the test piece and the pre-calculated result (the number is the same as that of the curved levers 301aa), each load balancing device assembly includes a load balancing device rear double ear 301l, a load balancing device 301k, a second load sensor 301j, and a load balancing device front single ear 301i, which are connected in sequence; the rear double lugs 301l of the load sharing device are fixed on a T-shaped groove base 301ag of a rear middle beam 301s, the front single lug 301i of the load sharing device is connected with the long edge of a curved lever 301aa, the curved lever 301i is fixed on a rotating support plate 301y through a rotating shaft 301ac, a tapered roller bearing 301ad is installed in a hole of the rotating support plate 301y, and an inner ring and an outer ring are respectively fixed through a locking nut 301ae and a bearing retainer ring 301 af; each load sharing device 301k is connected in parallel by adopting an oil inlet and outlet way, during loading, a piston rod of each load sharing device 301k outputs thrust, and the thrust is converted into a shearing force in the vertical direction through a curved lever 301aa and is applied to a side loading joint 106 connected with the side of the test piece 107.
Further, as shown in fig. 10 and 11, the structure of the right pillar assembly 302 is similar to that of the left pillar assembly, and detailed descriptions of the specific same structures are not repeated here, but the left pillar assembly is different from the right pillar assembly 302 in that a resultant pull plate assembly is further installed inside the left pillar assembly 301.
Specifically, as shown in fig. 8, the resultant pull plate assembly includes a sensor rear double ear 301o, a sensor rear single ear 301g, an elastic threaded sleeve 301f, a third load sensor 301e, and a sensor front single ear 301d, which are connected in sequence, wherein the sensor rear double ear 301o is fixed on a T-shaped slot base 301ag by a bolt group, the sensor front single ear 301d is connected with two pull plates 108 in the test piece assembly 1, and in order to eliminate the influence of the assembly gravity, a counterweight beam 301u, 2 fixed pulleys 301V, a steel wire rope 301T, a lifting ring screw 301q, a fixed counterweight 301p, and an adjustable counterweight 301n (the fixed counterweight 301p and the adjustable counterweight 301n together form a counterweight) are sequentially installed at the upper end of the left column assembly 301, wherein the fixed pulley 301V is installed on the counterweight beam 301u, one end of the steel wire rope 301T is connected with the lifting ring screw 301q fixed on the sensor front single ear 301d, the other end of the fixed pulley is connected with a lifting ring screw 301q fixed on a fixed counterweight 301p, and the lower end of the fixed counterweight 301p is provided with an adjustable counterweight 301 n.
Further, as shown in fig. 12, the beam assembly 303 includes a beam 303a, a pair of roller bearings 303e are installed inside the central hole of the beam 303a, and fixed by a bearing cover 303c and a lock nut 303d, and hinged to the support lug 205 through a beam rotating shaft 303b, the two ends of the beam 303a are installed with a shear-proof support seat 303f, a handle 303h, a screw 303i, a separate cover plate 303j, and a screw base 303k form a support rod assembly, which can provide support for the shear load applying assembly 3 when being installed, one end of the pull rod assembly 303g is connected to the shear-proof support seat 303f, and the other end is connected to the rear beam lug 301m in the left and right pillar assemblies, and functions to prevent the left and right pillar assemblies from sliding laterally when applying the shear load.
As shown in fig. 13, when the left and right upright assemblies apply a shear load, the shear load applying assembly 3 is subjected to a shear reaction force of the test piece 107, and tends to rotate counterclockwise around the cross beam rotating shaft 303b, because the front single lug 301d of the sensor in the left upright assembly 301 is hinged to the test piece assembly 1, the structure does not actually rotate, but applies a tensile force to the upper end of the test piece 107 in a lateral direction, the lower end of the test piece is fixed on the lower base 201 through a plurality of parts, and the whole shear load system is a self-balancing system. According to the moment balance principle, the load borne by the test piece is pure shear load, and the force flows on four sides are equal.
As shown in fig. 14, the frame/rib support member 4 (also called frame/rib support member) is fixed to the circular pillar 206 of the compressive load applying member 2, and the front end is connected to the rib end of the test piece 107 by a bolt.
Specifically, as shown in fig. 15, the support assembly 4 includes a cross beam 403, two rear hoops 402 fixing two ends of the cross beam 403, a front hoop 401 and the rear hoop 402 tightly hold the cross beam 403 on the column 206 by screws, a guide rail 414 is fixed on the cross beam 403, a low gravity center slider 404 can linearly slide along the guide rail, and a sliding support 405 is installed at an upper end of the low gravity center slider 404, and functions to fix the cylindrical guide rail 406 by using a locking block 407; the principle is the same as that of fixing the whole assembly on the circular column 206, a sliding block 413 is installed on the cylindrical guide rail 406, the sliding block 413 can slide along the cylindrical guide rail 406, in order to prevent the sliding block 413 from sliding down due to the action of gravity, a spring 412 is installed at the bottom of the sliding block 413, the rigidity of the spring is calculated in advance, a straight beam 408, an adapter 411, a turnbuckle 410 and a rib connecting plate 409 are sequentially connected to the front end of the sliding block 413, and the front end of the rib connecting plate 409 is connected with two ends of a rib or a frame of the test piece 107 through a plurality of bolts. The assembly consists of two sets of transverse and vertical guide rail sliding blocks which are perpendicular to each other, and the compression and shearing displacement are not limited while the end parts of the ribs are subjected to out-of-plane normal constraint.
Further, as shown in fig. 16, the anti-destabilization assembly 5 includes a front hoop 401, a rear hoop 402, and a top beam cross beam 501, similar to the support assembly 4, the lower end of the anti-destabilization assembly 5 is fixed on the upright 206 by the front and rear hoops, the upper end is fixed on the test piece top beam cross beam 603a by the stud 509, the large pad 510, and the nut 511, the two longitudinal beams 502, the top beam cross beam 501, and the test piece top beam cross beam 603a form a groined structure, the longitudinal beams 502 are provided with a plurality of groups of pull rod assemblies, each pull rod assembly is composed of a pad 503, a cylindrical double ear 504, a cylindrical single ear with a rod 505, a long rod 506, a cylindrical double ear with a rod 507, and a single ear connecting piece 508, as shown in fig. 17, the single ear connecting piece 508 at the front end of the assembly is connected with two holes of the side loading joint 106. In addition, two tie rod assemblies are preferably mounted to one of the lateral load joints 106 to prevent straight-sided buckling of the test piece.
Further, as shown in fig. 18, the positioning assembly 6 may include 4 sets of pressing table positioning beam assemblies 601, 2 sets of pressing table transverse positioning assemblies 602, and 2 sets of test piece end positioning assemblies 603, where the pressing table positioning beam assemblies 601 are used for adjusting the position of the upper pressing table 220 in the thickness direction of the skin, the pressing table transverse positioning assemblies 602 are used for adjusting the position of the upper pressing table 220 in the width direction of the skin, and the test piece end positioning assemblies 603 are used for adjusting the upper end of the test piece 107 to ensure that the upper end thereof is horizontal.
Specifically, as shown in fig. 19, the platen positioning beam assembly 601 includes: the pressing table top rod cross beam 601a is fixed on the circular column 206 through a front hoop 401 and a rear hoop 402, rectangular internal threads are pre-buried in a circular hole in the center line of the cross beam, a screw rod top rod 601g is screwed in the cross beam, a hand wheel 601d is fixed at the rear end of the screw rod top rod 601g through a locking nut 601b, a spring washer 601c, a large washer 601e and a flat key 601f, a top bead 601h is mounted in a front end hole of the screw rod top rod 601g, and the top bead cover 601i and a screw 601j are used for fixing the hand wheel. When the position is adjusted, the hand wheel is rotated to realize the forward and backward movement of the ejector rod.
As shown in fig. 20, the press table lateral positioning assembly 602 includes the same components as those of the press table positioning beam assembly 601, such as a lock nut 601b, a spring washer 601c, a hand wheel 601d, a flat key 601f, and a press table top rod longitudinal beam 602a, which is fixed on the slotted hole of the press table top rod cross beam 601a in the two sets of lower press table positioning beam assemblies 601 by two bolts 602c, and a short screw 602b is screwed in the hole of the press table top rod longitudinal beam 602 a.
As shown in fig. 21, the test piece end positioning assembly 603 is similar in structure to the press table positioning beam assembly 601, except that the test piece ejector beam 603a is two slotted holes, the movable ejector support 603d is mounted in the slotted holes, the inner hole of the slotted holes is rectangular thread, and the fastening nut 603b and the thin nut 603c are used for locking the position of the movable ejector beam, so that the test piece end positioning assembly has the advantages that the test piece end positioning assembly can be adjusted to a required fixed position along the length direction of the beam, and finally the lead screw is screwed into the movable ejector support 603 d.
In summary, the compression and shear load is completely and independently applied by the compression and shear test device for the flat wall panel, so that not only can separate compression or shear load and compression and shear composite load of any proportion be applied, but also the end part of a frame or a rib of a test piece is restrained, real boundary conditions are simulated, an anti-destabilization device is added, and the free edges at two sides can be effectively prevented from being damaged in advance; in addition, the shearing loading device adopts a transparent design, and an internal loading mechanism is clear and visible, so that the loading state can be observed in real time, and the shearing loading device is safe and reliable.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. The flat wallboard compression-shear test device is characterized by comprising a test piece assembly (1), a compression load applying assembly (2), a shear load applying assembly (3), a supporting assembly (4) and an anti-destabilizing assembly (5), wherein
The compressive load applying assembly (2) comprises:
a base (201) fixedly arranged on the horizontal mounting surface;
the top beam (207) is fixedly arranged on the top of the base (201) in parallel through at least four round upright posts (206), and a test space is formed between the bottom surface of the top beam (207) and the top surface of the base (201);
the short beam (203) is fixedly arranged at the top of the base (201);
the transfer beam (204) is fixedly arranged at the top of the short beam (203);
a compression ram (214) hinged at its top end to the bottom of the top beam (207), and the bottom of the compression ram (214) is provided with a first load sensor (215);
an upper pressing table (220) with the top end hinged to the bottom of the first load sensor (215);
the two supporting single ears (205) are fixedly arranged at the top of the base (201) and are symmetrically arranged at two sides of the short beam (203);
the test piece assembly (1) comprises:
the pressing beam (101) is fixedly arranged at the top of the transfer beam (204);
the test piece (107) is vertically arranged between the pressing beam (101) and the upper pressing table (220), and the bottom of the test piece is fixed with the top of the pressing beam (101);
the side loading joints (106) are fixedly arranged on the left side and the right side of the test piece (107), and each side loading joint (106) is provided with a loading shaft (103) capable of rotating around the axis of the side loading joint;
the shear load applying assembly (3) comprises:
the middle part of each beam assembly (303) is hinged with one supporting single lug (205), and a support rod assembly is arranged between the end parts of the left end and the right end of each beam assembly (303) and a horizontal mounting surface;
a left upright post assembly (301) hinged at the bottom to the left end of both said beam assemblies (303) for applying shear load to said test piece (107) through said side loading joint (106) on the left side;
a right column assembly (302) hinged at the bottom to the right end of both said beam assemblies (303) for applying shear load to said test piece (107) through said side loading joint (106) on the right side;
the support assembly (4) comprises:
the cross beam (403) is horizontally arranged on two adjacent round columns (206) and is parallel to the surface of the test piece (107);
the straight beam (408) is movably arranged on the cross beam (403) and is used for laterally supporting the test piece (107);
the anti-destabilization assembly (5) comprises:
the top beam cross beam (501) is horizontally arranged on two adjacent round columns (206) and is parallel to the surface of the test piece (107);
the test piece ejector rod cross beam (603a) is horizontally arranged on two adjacent round stand columns (206) and is parallel to the surface of the test piece (107);
the two longitudinal beams (502), the top beam cross beam (501) and the test piece ejector rod cross beam (603a) form a groined structure;
and the long rods (506) are vertical to the surface of the test piece (107), one end of each long rod is arranged on the longitudinal beam (502) in a sliding mode along the vertical direction, and the other end of each long rod is connected with the side loading joint (106).
2. The flat panel compression shear test apparatus of claim 1, wherein the compressive load applying assembly (2) further comprises:
a base monaural (209) fixedly disposed with a bottom of the top beam (207), wherein a top end of the compression ram (214) is hinged to the base monaural (209);
and the top end of the ball hinge connecting piece is fixedly connected with the bottom of the first load sensor (215), and the bottom end of the ball hinge connecting piece is fixedly connected with the upper pressing table (220).
3. The flat panel compression shear test apparatus of claim 1, wherein said beam assembly (303) comprises:
crossbeam (303a), crossbeam (303a) middle part seted up with support the recess of monaural (205) shape looks adaptation, crossbeam (303a) establish through the recess the support monaural (205) are last, and through run through simultaneously at the middle part crossbeam (303a) and crossbeam pivot (303b) of supporting monaural (205) are connected, crossbeam pivot (303b) with be provided with roller bearing (303e) between crossbeam (303 a).
4. The flat panel compression shear test apparatus of claim 3, wherein said brace bar assembly comprises:
the lead screw base (303k) at the bottom of the lead screw (303i) is vertically arranged on the horizontal mounting surface, and the top of the lead screw (303i) is provided with a handle (303 h);
the anti-shearing support seat (303f) is fixedly arranged at the end parts of the left end and the right end of the cross beam (303a) and is provided with a threaded hole matched with the lead screw (303 i).
5. The flat panel compression shear test apparatus of claim 4, wherein said left stud assembly (301) comprises a left stud front half and a left stud rear half, said left stud front half comprising:
the top and the bottom of the two front transition beams (301x) are respectively fixedly connected through an upper connecting block (301w) and a lower connecting block (301 ab);
the two front edge beams (301b) are respectively and fixedly arranged at two sides of the two front transition beams (301x), and the bottoms of the two front edge beams (301b) are respectively hinged to the left end parts of the two cross beam assemblies (303) through front edge beam single lugs (301 h);
the left upright post rear half includes:
a rear center sill (301s) parallel to the two front transition sills (301 x);
the two rear edge beams (301r) are respectively and fixedly arranged at two sides of the rear middle beam (301s), and the bottoms of the two rear edge beams (301r) are respectively hinged to the left end parts of the two beam assemblies (303) through rear edge beam lugs (301 m);
the left upright assembly (301) further comprises:
the two rotating support plates (301y) are arranged between the two front transition beams (301x) in parallel at intervals;
the middle part of each curved lever (301aa) is rotatably arranged between the two rotating support plates (301y) through a rotating shaft (301ac), the number and the positions of the curved levers (301aa) are matched with those of the loading shafts (103) on the side loading joints (106) on the corresponding side, and one end of each curved lever (301aa) is used for driving the loading shaft (103);
the number of the load sharing devices (301k) is the same as that of the curved levers (301aa), one end of each load sharing device (301k) is hinged to the rear middle beam (301s), and the other end of each load sharing device (301k) is provided with a second load sensor (301j) and is hinged to the other end of the corresponding curved lever (301 aa);
the tie rods (301a) are horizontally arranged between the front edge beam (301b) and the rear edge beam (301r) on the same side, the number of the tie rods on the same side is at least two, and the end parts of the two ends of each tie rod (301a) are respectively hinged with the front edge beam (301b) and the rear edge beam (301 r);
the diagonal draw bar (301c) is obliquely arranged between the front edge beam (301b) and the rear edge beam (301r) on the same side with the horizontal plane, and the end parts of the two ends of the diagonal draw bar are respectively hinged with the front edge beam (301b) and the rear edge beam (301 r);
the back side beam lug (301m) is hinged to the bottom of the back side beam (301 r);
and one end of the pull rod assembly (303g) is hinged to the anti-shearing supporting seat (303f) at the left end, and the other end of the pull rod assembly is hinged to the back side beam lug (301 m).
6. The flat panel compression shear test device of claim 5, wherein said test piece assembly (1) further comprises:
two pulling plates (108) fixedly clamped on the top of the test piece (107) and extending along the horizontal direction;
the left upright assembly (301) further comprises:
the T-shaped groove base (301ag) is fixedly arranged on the rear middle beam (301s) along the vertical direction;
one end of the rear single lug (301g) of the sensor is arranged in the T-shaped groove base (301ag) in a sliding mode;
one end of the third load sensor (301e) is hinged with the rear single lug (301g) of the sensor, and the other end of the third load sensor is hinged with the two pull plates (108) through the front single lug (301d) of the sensor;
the counterweight beam (301u) is horizontally and fixedly provided with the rear middle beam (301s) and the top of the upper connecting block (301w), and a fixed pulley (301v) is arranged on the counterweight beam (301 u);
and the counterweight part is connected to the top of the front single ear (301d) of the sensor through a steel wire rope (301t) passing through a fixed pulley (301 v).
7. The flat panel compression shear test apparatus of claim 5, wherein said right stud assembly (302) comprises a right stud front half and a right stud rear half, said right stud front half comprising:
the top and the bottom of the two front transition beams (301x) are respectively fixedly connected through an upper connecting block (301w) and a lower connecting block (301 ab);
the two front edge beams (301b) are respectively and fixedly arranged at two sides of the two front transition beams (301x), and the bottoms of the two front edge beams (301b) are respectively hinged to the right end parts of the two cross beam assemblies (303) through front edge beam single lugs (301 h);
the right pillar back half includes:
a rear center sill (301s) parallel to the two front transition sills (301 x);
the two rear edge beams (301r) are respectively and fixedly arranged at two sides of the rear middle beam (301s), and the bottoms of the two rear edge beams (301r) are respectively hinged to the right end parts of the two beam assemblies (303) through rear edge beam lugs (301 m);
the right post assembly (302) further comprises:
the two rotating support plates (301y) are arranged between the two front transition beams (301x) in parallel at intervals;
the middle part of each curved lever (301aa) is rotatably arranged between the two rotating support plates (301y) through a rotating shaft (301ac), the number and the position of the curved levers (301aa) are matched with those of the loading shafts (103) on the side loading joints (106) on the corresponding side, and one end of each curved lever (301aa) is used for driving the loading shaft (103) and is driven in the opposite direction to the curved lever (301aa) in the right upright post assembly (302);
the number of the load sharing devices (301k) is the same as that of the curved levers (301aa), one end of each load sharing device (301k) is hinged to the rear middle beam (301s), and the other end of each load sharing device (301k) is provided with a second load sensor (301j) and is hinged to the other end of the corresponding curved lever (301 aa);
the tie rods (301a) are horizontally arranged between the front edge beam (301b) and the rear edge beam (301r) on the same side, the number of the tie rods on the same side is at least two, and the end parts of the two ends of each tie rod (301a) are respectively hinged with the front edge beam (301b) and the rear edge beam (301 r);
the diagonal draw bar (301c) is obliquely arranged between the front edge beam (301b) and the rear edge beam (301r) on the same side with the horizontal plane, and the end parts of the two ends of the diagonal draw bar are respectively hinged with the front edge beam (301b) and the rear edge beam (301 r);
the back side beam lug (301m) is hinged to the bottom of the back side beam (301 r);
one end of the pull rod assembly (303g) is hinged to the anti-shearing supporting seat (303f) at the right end, and the other end of the pull rod assembly is hinged to the back side beam lug (301 m).
8. The flat panel compression shear test apparatus of claim 7, wherein the support assembly (4) further comprises:
a guide rail (414) horizontally fixed on the cross beam (403);
a low center of gravity slider (404) slidably disposed on the guide rail (414);
one end of the sliding support (405) is fixedly connected with the low gravity center sliding block (404), the other end of the sliding support is provided with a U-shaped opening, a vertical cylindrical guide rail (406) is arranged in the U-shaped opening, a sliding block (413) is arranged on the cylindrical guide rail (406), and a spring (412) is sleeved on the cylindrical guide rail (406) at the bottom of the sliding block (413), wherein the spring (412) is sleeved on the cylindrical guide rail (406)
One end of the straight beam (408) is fixedly connected with the sliding block (413), the other end of the straight beam (408) is connected with a rib connecting plate (409), and the rib connecting plate (409) is fixedly connected with the test piece (107).
9. The flat panel compression shear test apparatus of claim 5, wherein the buckling prevention assembly (5) further comprises:
strip-shaped holes are formed in the top beam cross beam (501) and the test piece ejector rod cross beam (603a), and two ends of the longitudinal beam (502) are arranged in the strip-shaped holes in a sliding mode through a double-end stud (509);
a clamping groove is formed in the longitudinal beam (502) along the vertical direction;
one end of each cylindrical double lug (504) is arranged in the clamping groove in a sliding mode;
the device comprises a cylindrical single lug with a rod (505) and a cylindrical double lug with a rod (507), wherein one end of the long rod (506) is hinged to the other end of the cylindrical double lug (504) through the cylindrical single lug with a rod (505), the other end of the long rod (506) is hinged to a single lug connecting piece (508) through the cylindrical double lug with a rod (507), and the single lug connecting piece (508) is connected with a side loading joint (106) on the corresponding side.
10. The flat panel shear test device according to claim 5, further comprising a positioning assembly (6), the positioning assembly (6) comprising:
the pressing table ejector rod cross beam (601a) is horizontally arranged on two adjacent round stand columns (206), is parallel to the surface of the test piece (107), is positioned at the top of the test piece ejector rod cross beam (603a), and is provided with a rectangular internal thread towards the test piece (107) at the center line of the pressing table ejector rod cross beam (601 a);
the screw rod ejector rod (601g) is arranged in the rectangular internal thread in an adaptive mode, an ejector bead (601h) is arranged at one end part, close to the test piece (107), of the screw rod ejector rod (601g), and a hand wheel (601d) is arranged at one end part, far away from the test piece (107), of the screw rod ejector rod (601 g);
the end parts of two ends of the pressure table ejector rod longitudinal beam (602a) are respectively and fixedly connected to two pressure table ejector rod cross beams (601a) positioned on two sides of the plane direction of the test piece (107), and a rectangular internal thread is formed in the center line of the pressure table ejector rod longitudinal beam (602a) towards the test piece (107);
the short lead screw (602b) is arranged in a rectangular internal thread of the pressing table ejector rod longitudinal beam (602a) in an adaptive mode, and a hand wheel (601d) is arranged at one end portion, far away from the test piece (107), of the short lead screw (602 b).
CN202010561095.XA 2020-06-18 2020-06-18 Straight wallboard compression shear test device Active CN111595699B (en)

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