CN113324852A - Interface bonding static and dynamic performance test device and test method - Google Patents
Interface bonding static and dynamic performance test device and test method Download PDFInfo
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- CN113324852A CN113324852A CN202110460400.0A CN202110460400A CN113324852A CN 113324852 A CN113324852 A CN 113324852A CN 202110460400 A CN202110460400 A CN 202110460400A CN 113324852 A CN113324852 A CN 113324852A
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
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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
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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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
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
Abstract
The invention discloses an interface bonding static and dynamic performance test device and a test method, and belongs to the technical field of material interface tests. The device comprises a test piece unit, a test piece unit and a test piece unit, wherein the test piece unit comprises an inner die I and an inner die II, the end surfaces of which are butted with each other; the first outer die is provided with a first assembling hole, the first inner die is detachably connected in the first assembling hole, and a convex block is formed on the end face, facing the second inner die, of the first outer die in a protruding mode; the second outer die is provided with a second assembling hole, the second inner die is detachably connected into the second assembling hole, a sliding groove matched with the bump is formed on the end face, facing the first inner die, of the second outer die, and the length of the sliding groove is larger than that of the bump; when the convex block is matched and connected with the sliding groove, the height position of the first bottom surface of the outer die is lower than that of the second bottom surface of the outer die, and the height position of the first top surface of the outer die is lower than that of the second top surface of the outer die. The invention can realize the static and dynamic performance test of the bonding interface under the stretching and shearing loading effects by only one test device, and has convenient assembly and low test cost.
Description
Technical Field
The invention belongs to the technical field of material interface tests, and particularly relates to an interface bonding static and dynamic performance test device and a test method.
Background
Concrete is one of the most important civil engineering materials in the present generation, has the advantages of high compressive strength, good durability and the like, and inevitably forms a bonding interface with other building materials and even old concrete when the concrete material is applied, and the strength and durability of the bonding interface are often smaller than those of the concrete material, so that the research on the mechanical property of the bonding interface is a key factor for researching whether the concrete can work together with other materials.
The indexes for representing the mechanical properties of the bonding interface are many, such as tensile strength of the interface, shear strength of the interface, fracture energy of the interface, fatigue strength of the interface and the like, a single interface mechanical test in the prior art is usually only aimed at a single interface mechanical property index, and special samples are required to be respectively manufactured for different interface mechanical property indexes, so that the cost and the time are high, and the static and dynamic mechanical properties of the interface are difficult to comprehensively research.
For example, chinese patent publication No.: CN 205157405U; the publication date is as follows: 2016, 4 months and 13 days; the pure shearing experimental device comprises an upper L-shaped clamp, a lower L-shaped clamp, a bolt, a side chuck, a concrete sample, an experimental machine base, an experimental machine pressure head, a screw and a spring, wherein the upper L-shaped clamp is placed in an inverted mode and forms an unsealed square frame structure with the lower L-shaped clamp, and a certain distance is reserved between the upper L-shaped clamp and the lower L-shaped clamp in the vertical direction; the left side and the right side of the interior of the non-closed square frame-shaped structure formed by the upper L-shaped clamp and the lower L-shaped clamp are provided with slideways along the front-back direction of a horizontal plane, the side chucks are movably arranged at two ends of the slideways, the side chucks clamp the front and back surfaces of the concrete test piece, and bolts penetrate through the side chucks at two ends of the slideways to fasten the front and back surfaces of the concrete test piece; the top of the upper L-shaped clamp is provided with a force loading device; the bottom of the lower L-shaped clamp is fixedly arranged on the experimental machine base. The device of this application can only test to the shearing atress performance of concrete bonding interface.
As another example, chinese patent publication No.: CN 110455643A; the publication date is as follows: 11/15/2019; the device comprises a spherical hinge connecting rod, a screw rod, a base plate, plain concrete, a horizontal mounting device, an upper bearing plate and a lower bearing plate; four corners of the upper bearing plate are provided with four symmetrical smooth round holes of the upper bearing plate, and four corners of the lower bearing plate are provided with four internal thread holes of the lower bearing plate which are coaxial with the central line of the upper bearing plate; the upper bearing plate and the lower bearing plate are connected through a screw rod which penetrates through the smooth round hole of the upper bearing plate and the corresponding inner threaded hole of the lower bearing plate, and the screw rod is provided with an upper nut and a lower nut. The device of this application can only test to the tensile atress performance of concrete bonding interface.
The test devices in the above two applications can only test the shear stress performance or the tensile stress performance respectively, if the static and dynamic mechanical properties of the same material interface bonding need to be comprehensively researched, two test devices need to be prepared, and at least two groups of test pieces are poured according to the adaptive test piece shapes of the two test devices, so that the time cost and the material consumption cost are both high.
Disclosure of Invention
In order to solve at least one of the above technical problems, according to an aspect of the present invention, there is provided an interfacial adhesion static and dynamic performance testing apparatus, comprising:
the test piece unit comprises a first inner die and a second inner die which are butted in end faces, and the first test piece and the second test piece with bonding interfaces are respectively arranged in the first inner die and the second inner die;
the first outer die is provided with a first assembling hole, the first inner die is detachably connected in the first assembling hole, and a convex block is formed on the end face, facing the second inner die, of the first outer die in a protruding mode;
the second outer die is provided with a second assembling hole, the second inner die is detachably connected into the second assembling hole, a sliding groove matched with the bump is formed on the end face, facing the first inner die, of the second outer die, and the length of the sliding groove is larger than that of the bump;
when the convex block is matched and connected with the sliding groove, the height position of the first bottom surface of the outer die is lower than that of the second bottom surface of the outer die, and the height position of the first top surface of the outer die is lower than that of the second top surface of the outer die.
The interface bonding static and dynamic performance test device has the advantages that test pieces to be tested and detected are placed in the first inner die and the second inner die of the test piece unit, then the first outer die and the second outer die are assembled outside, the first outer die and the second outer die are connected in a matching mode in different forms, the working force application characteristics of a universal testing machine during interface static and dynamic shear tests and interface static and dynamic tensile tests are met, two sets of test piece units are prepared during tests, different performance tests can be performed by matching the first outer die and the second outer die, the influence of non-shearing force or other acting forces of non-stretching force during force application of the universal testing machine can be borne by the aid of the first outer die and the second outer die, and effectiveness of test results can be improved.
The interfacial adhesion static and dynamic performance testing device according to the embodiment of the present invention may be, optionally,
a first side opening is formed in one side surface of the inner die close to the second inner die;
two corresponding side surfaces of the inner die are provided with a second side opening near the first inner die;
the test piece unit further comprises a baffle plate, the baffle plate is arranged at the first side opening and the second side opening in a matched mode, and the baffle plate is detachably connected with the first inner die and the second inner die.
The structure cooperation of test piece unit side opening and baffle, on the one hand is when pouring the test piece, the effective fixed connection of the interior mould of being convenient for and the shaping of test piece of interior mould two, and on the other hand, the baffle of detachable forms bonding interface after the test piece, removes the baffle, exposes bonding interface under the side opening, conveniently pastes stress piece or draws DIC equipment discernment and uses the grid pattern when supplying follow-up experimental analysis in bonding interface department.
The interfacial adhesion static and dynamic performance testing device according to the embodiment of the present invention may be, optionally,
the first side opening is provided with two positions which are respectively arranged on two opposite side surfaces of the first inner die;
the second side opening is provided with two positions which are respectively arranged on two opposite side surfaces of the second inner die;
the baffle has two.
According to the interface bonding static and dynamic performance test device provided by the embodiment of the invention, optionally, the first inner die and the second inner die are in the same shape and are symmetrically arranged, and the first inner die and the second inner die are both in a square tube shape with two open ends.
The first inner mold and the second inner mold are convenient to pour and form, the end faces of the openings of the first inner mold and the second inner mold are placed on the concrete formwork with the demolding agent, the first inner mold and the second inner mold are matched with the baffle structure to pour, and the first inner mold and the second inner mold are convenient to demold the test piece after the test is completed.
The interfacial adhesion static and dynamic performance testing device according to the embodiment of the present invention may be, optionally,
a side surface of the first outer die, which corresponds to the first opening on one side of the inner die, is also provided with a third opening with the same shape;
and the side surface of the second outer die, which corresponds to the second openings on the two sides of the inner die, is also provided with a fourth opening with the same shape.
The side opening setting of two symmetry formulas on the test piece unit, the side opening setting of two symmetry formulas on cooperation outer mould one, the outer mould two for when the outer mould of this device and interior mould assemble, there is the selection of more assembly directions, and two side openings can carry out more effective comprehensive performance monitoring to the bonding interface simultaneously.
The interfacial adhesion static and dynamic performance testing device according to the embodiment of the present invention may be, optionally,
the convex block of the first outer die is a dovetail convex;
the sliding grooves of the outer die II are in matched dovetail-shaped depressions.
The first outer die and the second outer die are in a dovetail type matching connection mode, so that the influence of bending moment generated by the universal testing machine during asymmetric loading of the upper surface and the lower surface on a shear test can be eliminated, and the effectiveness of a shear test result is ensured.
The interfacial adhesion static and dynamic performance testing device according to the embodiment of the present invention may be, optionally,
a first mounting hole is formed through the side wall of one edge of the inner die, the first mounting hole is provided with two positions, and the first mounting hole is symmetrically formed in the top and the bottom of the first inner die;
a third mounting hole is formed through the side wall of the edge of the second inner die, the third mounting hole is provided with two positions, and the third mounting hole is symmetrically formed in the top and the bottom of the second inner die;
a mounting hole six is formed in the position, corresponding to the mounting hole, of the outer die I in a penetrating mode, and the outer die I is fixedly connected with the inner die I through the mounting hole six and the mounting hole I by the aid of a fixing screw rod II;
a mounting hole seventh is formed in the outer die II in a penetrating mode at a position corresponding to the mounting hole, and the outer die II and the inner die II are fixedly connected through a fixing screw rod III penetrating through the mounting hole seventh and the mounting hole III.
Can dismantle through the mode of fixed lead screw and nut between outer mould and the interior mould and be connected, the dismouting is all very convenient, and several mounting hole symmetrical formula's the form that sets up for interior mould and external mold have multiple position state that can effectively fix and arrange, when carrying out the static and dynamic shear test of interface and the static and dynamic tensile test of interface needs to change the connected mode between two outer moulds, the outer mould after interior mould also can effectively and transform the position is fixed.
According to another aspect of the present invention, there is provided a method for testing interfacial adhesion static and dynamic properties, comprising the steps of:
firstly, preparing a test piece:
a1, preparing a first test piece, namely installing a baffle at a first side opening of a first inner mould, pouring concrete material into the first inner mould until the baffle is flush with one end face of the first inner mould to form the first test piece;
a2, preparing a second test piece, after the first test piece is maintained, butting and fixing the second inner mold with the second inner mold through a baffle, pouring other materials into the second inner mold until the materials are flush with the two end surfaces of the second inner mold to form the second test piece;
secondly, preparation before testing:
after the test piece II is molded, the baffle is removed, and a strain gauge is pasted or a grid graph for identifying DIC equipment is drawn on the bonding interface exposed at the positions of the first side opening and the second side opening;
thirdly, static and dynamic performance test:
according to different test purposes, the first outer die and the second outer die are matched and connected in different modes, the first outer die is just opposite to the second outer die, the first butted inner die and the second butted inner die extend into the assembly holes to corresponding positions, the first outer die and the first inner die are fixedly connected through the second fixed screw rod, the second outer die and the second inner die are fixedly connected through the third fixed screw rod, and a universal testing machine is started to perform tests.
According to the interface bonding static and dynamic performance test method provided by the embodiment of the invention, optionally, in the third step, two matching connection modes are adopted for the first outer die and the second outer die:
A. when an interface static and dynamic shear test is required, a convex block of the first outer die is matched and connected with a sliding groove of the second outer die, when a first assembly hole of the first outer die is aligned with a second assembly hole of the second outer die, the height position of the bottom surface of the first outer die is lower than that of the bottom surface of the second outer die, and the height position of the top surface of the first outer die is lower than that of the top surface of the second outer die;
B. when interface static and dynamic tensile test needs to be carried out, the top surface of the outer die II faces to the direction of the bottom surface of the outer die I, the first assembling hole of the outer die I is just opposite to the second assembling hole of the outer die II, after the inner die I and the inner die II are assembled to be fixed, the top surface of the outer die II is arranged towards the horizontal direction, and two clamps of the universal testing machine respectively clamp the outer die I and the outer die II to carry out static and dynamic loading.
Advantageous effects
According to the interface bonding static and dynamic performance test device, the test piece unit, the outer mold I and the outer mold II are connected in different matching modes, so that an interface static and dynamic shear test and an interface static and dynamic tensile test can be performed by using a common universal testing machine in a mechanics laboratory, the test device is simple in structure, convenient to assemble and low in test cost, and static and dynamic performances of an interface formed by concrete and various materials under the action of tensile and shear loading can be conveniently and effectively researched; the interface bonding static and dynamic performance test method is simple to operate, and can complete the interface static and dynamic shear test and the interface static and dynamic tensile test by utilizing different assembly modes of the interface bonding static and dynamic performance test device.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
FIG. 1 is a schematic diagram showing the structure of a test piece unit of the interface bonding static and dynamic performance testing device of the invention;
FIG. 2 shows an exploded view of the test piece cell structure of the present invention;
FIG. 3 is a schematic structural diagram of an interface bonding static and dynamic performance testing device of the present invention during an interface static and dynamic shear test;
FIG. 4 is a schematic structural decomposition diagram of the interface bonding static and dynamic performance testing device of the present invention during the interface static and dynamic shear test;
FIG. 5 is a schematic structural diagram of an interface bonding static and dynamic performance testing device of the present invention when performing an interface static and dynamic tensile test;
FIG. 6 is a schematic structural decomposition diagram of the interface bonding static and dynamic performance testing device of the present invention when performing an interface static and dynamic tensile test;
reference numerals:
1. a test piece unit; 10. a first inner die; 100. the side is provided with a first opening; 101. a first mounting hole; 102. a second mounting hole; 11. a second inner die; 110. a second side opening; 111. a third mounting hole; 112. a fourth mounting hole; 12. a baffle plate; 120. a fifth mounting hole; 13. fixing a first screw rod; 14. a first nut;
2. a first outer die; 20. a first assembling hole; 21. opening a third side; 22. mounting holes six; 23. fixing a screw rod II; 24. a second nut; 25. a bump; 200. shearing the loading surface;
3. a second outer die; 30. a second assembling hole; 31. opening the side four; 32. a seventh mounting hole; 33. fixing a screw rod III; 34. a third nut; 35. a chute; 300. shearing the loading surface upwards;
4. a first test piece;
5. and (5) testing a second test piece.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "a," "an," "two," and similar referents in the description and claims of this patent application does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another.
Example 1
The interfacial adhesion static and dynamic performance testing apparatus of the present invention will be further described with reference to fig. 1 to 6.
As shown in fig. 1 and 2, the test piece unit 1 of the present embodiment includes a first inner mold 10 and a second inner mold 11, both the first inner mold 10 and the second inner mold 11 are square tubular with openings at both ends, the first inner mold 10 and the second inner mold 11 are identical in shape and size and are symmetrically arranged, and each of the two inner molds has an end surface which is butted with each other; from the perspective of fig. 1 and 2, a first rectangular side opening 100 is formed in the front side of the first inner mold 10, which is close to the position where the first inner mold 11 is in butt joint with the second inner mold, so that the front side of the first inner mold 10 is in a side-mounted concave shape, a first side opening 100 with the same shape and size is also formed in the position where the rear side of the first inner mold 10 is at the same height, similarly, a second rectangular side opening 110 is formed in the front side of the second inner mold 11, which is close to the position where the first inner mold 10 is in butt joint with the second inner mold, the first side opening 110 is at the height position of the second side opening 110, the first side opening 100 is at the same shape and size of the second side opening 110, and a second side opening 110 with the same shape and size is also formed in the position where the rear side of the second inner mold 11 is at the same height; the test piece unit 1 further comprises a baffle plate 12, the shape of the baffle plate 12 is the same as that between a first side opening 100 and a second side opening 110 of a butt joint of a first inner die 10 and a second inner die 11, and two baffle plates 12 are correspondingly arranged at front and rear side openings; as shown in fig. 2, a plurality of first mounting holes 101 vertically penetrate through the wall surface of the first inner mold 10 above the first side opening 100, a plurality of third mounting holes 111 vertically penetrate through the wall surface of the second inner mold 11 above the second side opening 110, a plurality of fifth mounting holes 120 vertically penetrate through the top surface of the baffle 12, and the positions of the fifth mounting holes 120 correspond to the first mounting holes 101 and the third mounting holes 111 respectively; the test piece unit 1 further comprises a first fixing screw 13 and a first nut 14, the first fixing screw 13 is matched and connected with the first nut 14, a plurality of first fixing screws 13 penetrate through the first mounting holes 101 and the fifth mounting holes 120, the first inner die 10 and the baffle 12 are fixed, and the second inner die 11 and the baffle 12 are fixed after penetrating through the third mounting holes 111 and the fifth mounting holes 120.
The test piece unit 1 of the embodiment is used by placing an opening end face of a first inner mold 10, which is not provided with a first side opening 100, on a concrete template brushed with a release agent downwards, fixedly connecting two baffles 12 with the first inner mold 10 through a first fixing screw 13 and a first nut 14 respectively, pouring concrete inwards from an opening at the other end of the first inner mold 10, filling the first inner mold 10 to prepare a first test piece 4, fixing a second inner mold 11 with the baffles 12 through a second side opening 110, pouring other test piece materials inwards from an opening at the top of the second inner mold 11, wherein the other test piece materials such as concrete, rubber, polyurethane and the like can form a bonding interface with the concrete, specifically determining according to test requirements, obtaining a second test piece 5 after pouring, forming a bonding interface between the first test piece 4 and the second test piece 5, and the bonding interface position is a butt joint of the first inner mold 10 and the second inner mold 11, then removing the first nut 14 and the first fixing screw 13, taking down the baffle 12 to expose bonding interfaces of the two test pieces, and sticking a stress sheet or drawing a grid graph for identifying DIC equipment at the bonding interface exposed at the first side opening 100 and the second side opening 110 for use in subsequent test analysis; further, two sets of test piece units 1 are prepared, the pouring forming of the test pieces in the two sets of test piece units 1 can be carried out simultaneously, and different test piece units 1 are matched with the outer die for assembling aiming at different interface bonding static and dynamic performance tests.
As shown in fig. 4 and 6, the first outer mold 2 of the present embodiment is rectangular, a first assembly hole 20 is formed through one end surface of the first outer mold 2, the first assembly hole 20 is matched with the first inner mold 10 in shape, the first inner mold 10 can be accommodated in the first assembly hole 20, a third side opening 21 is formed at a position corresponding to a first opening 100 of the first inner mold 10 on the front side of the first outer mold 2 after assembly, the third side opening 21 is the same in shape and size as the first opening 100, and the third side opening 21 is also formed at a position corresponding to a second opening 100 on the rear side of the first outer mold 2 when viewed from the perspective of fig. 4; from the perspective of fig. 4, the upper part of the end surface of the first outer die 2 facing the second inner die 11 is convexly provided with a bump 25, and the bump 25 is vertically arranged in the length direction;
as shown in fig. 4 and 6, the second outer mold 3 of the present embodiment is rectangular, a second assembly hole 30 is formed through one end surface of the second outer mold 3, the second assembly hole 30 is matched with the second inner mold 11 in shape, the second inner mold 11 can be accommodated in the second assembly hole 30, a fourth side opening 31 is formed at a position corresponding to the second side opening 110 of the second inner mold 11 on the front side of the second outer mold 3 after assembly, the fourth side opening 31 is the same in shape and size as the second side opening 110, and the fourth side opening 31 is also formed at a position corresponding to the rear side of the second outer mold 3, as viewed from the perspective of fig. 4; from the perspective of fig. 4, the outer mold two 3 is concavely formed with a sliding groove 35 towards the upper part of the end surface of the inner mold one 10, the length direction of the sliding groove 35 is vertically arranged, and the length of the sliding groove 35 is greater than that of the bump 25.
Furthermore, in this embodiment, the first inner mold 10 is detachably connected with the first outer mold 2, and the structure is that, as seen from the perspective of fig. 2, a second mounting hole 102 is horizontally formed through the front side surface of the first inner mold 10, the second mounting hole 102 has two positions, the two positions respectively penetrate through the side walls of the top edge and the bottom edge of the first inner mold 10 and are not communicated with the space where the first test piece 4 is located, and the two mounting holes 102 are symmetrical with respect to the horizontal central line of the first inner mold 10; a mounting hole six 22 is formed in the position, corresponding to the mounting hole two 102 of the inner mold one 10, of the outer mold one 2, and the outer mold one 2 and the inner mold one 10 are detachably connected through a fixing screw rod two 23 and a nut two 24, as shown in fig. 4 and 6;
similarly, in the embodiment, the second inner mold 11 is detachably connected with the second outer mold 3, and the structure is that, as seen from the perspective of fig. 2, a fourth mounting hole 112 is horizontally formed through the front side surface of the second inner mold 11, two mounting holes are formed in the fourth mounting hole 112, the two mounting holes respectively penetrate through the side walls of the top edge and the bottom edge of the second inner mold 11, and are uniformly distributed and communicated with the space where the second test piece 5 is located, and the two mounting holes four 112 are symmetrical relative to the horizontal central line of the second inner mold 11; a mounting hole seven 32 is formed in the position, corresponding to the mounting hole four 112 of the inner mold two 11, of the outer mold two 3, and the outer mold two 3 and the inner mold two 11 are detachably connected through a fixing screw rod three 33 and a nut three 34, as shown in fig. 4 and 6;
because the two mounting holes 102 are symmetrical relative to the horizontal center line of the first inner mold 10, the first inner mold 10 which is rotated by 180 degrees relative to the first outer mold 2 can be normally assembled, and similarly, because the two mounting holes 112 are symmetrical relative to the horizontal center line of the second inner mold 11, the second inner mold 11 which is rotated by 180 degrees relative to the second outer mold 3 can be normally assembled.
The assembly structure form of the first outer die 2 and the second outer die 3 of the embodiment has two types, and the requirements of an interface static and dynamic shear test and an interface static and dynamic tensile test are respectively met:
as shown in fig. 3, in order to illustrate the assembling structure of the outer mold one 2 and the outer mold two 3 and the test piece unit 1 during the interface static and dynamic shear test, when viewed from the perspective of fig. 3, the thickness of the bottom of the outer mold one 2 below the inner mold one 10 is greater than that of the bottom of the outer mold two 3 below the inner mold two 11, the protrusion 25 of the outer mold one 2 is in fit connection with the chute 35 of the outer mold two 3, the top surface of the outer mold two 3 is an upper shear loading surface 300, the upper loading head of the universal testing machine is in contact with this surface, the bottom surface of the outer mold one 2 is a lower shear loading surface 200, and the lower loading head of the universal testing machine is in contact with this surface;
as shown in fig. 5, in order to provide an assembly structure of the first outer mold 2, the second outer mold 3 and the test piece unit 1 during the interface static and dynamic tensile test, when viewed from the perspective of fig. 5, the top surface of the second outer mold 3 faces the bottom surface of the first outer mold 2, that is, with respect to the structure of the interface static and dynamic shear test, the second outer mold 3 is rotated 180 degrees and then connected with the first outer mold 2, and at this time, the bump 25 is not connected with the chute 35 in a matching manner, and due to the arrangement characteristics of the four mounting holes 112 and the seven 32 mounting holes, the second outer mold 3 can still be effectively connected with the second inner mold 11 through the third fixing screw rod 33 and the third nut 34 after being rotated 180 degrees; the top surface of the second outer mold 3 and the bottom surface of the first outer mold 2 face the horizontal direction, the upper clamp of the universal testing machine clamps the second outer mold 3, and the lower clamp clamps the first outer mold 2.
Further, the protruding block 25 in this embodiment is a dovetail-shaped protruding structure, and the sliding groove 35 in this embodiment is a dovetail groove, as shown in fig. 4 and fig. 6, by structural cooperation of the dovetail-shaped protruding block 25 and the sliding groove 35, after the first outer mold 2 and the second outer mold 3 are connected by using this structure, the tendency that the first outer mold 2 and the second outer mold 3 move relatively in other directions except the length direction of the sliding groove 35 can be effectively limited, and when the universal testing machine performs the interface static and dynamic shear test, this structure can eliminate the influence of the bending moment generated when the upper and lower surfaces of the universal testing machine are asymmetrically loaded on the shear test, so that the test result is more accurate and effective.
Example 2
This example shows the test method using the interfacial adhesion static and dynamic property test apparatus of example 1, comprising the following steps:
firstly, preparing a test piece:
a1, preparing a first test piece, namely installing a baffle 12 at a position of a first side opening 100 of a first inner mold 10, pouring concrete materials into the first inner mold 10 until the concrete materials are flush with the end face of the first inner mold 10 to form a first test piece 4;
a2, preparing a test piece II, after the maintenance of the test piece I4 is finished, butting and fixing the inner mold II 11 and the inner mold I10 through a baffle 12, pouring other materials into the inner mold II 11, such as concrete, rubber, polyurethane and other materials which can form a bonding interface with the concrete, specifically determining according to test requirements, pouring the materials until the materials are flush with the end face of the inner mold II 11 to form a test piece II 5, wherein the bonding interface between the test piece I4 and the test piece II 5 is the butting end face of the inner mold I10 and the inner mold II 11;
repeating the step one twice, and preparing two sets of test pieces for a tensile test and a shearing test respectively;
secondly, preparation before testing:
after the test piece II 5 is molded, the baffle 12 is removed, a strain gauge is pasted or a grid diagram for identifying DIC equipment is drawn on the bonding interface exposed at the positions of the first side opening 100 and the second side opening 110, and performance parameters are conveniently detected;
thirdly, static and dynamic performance test:
according to different test purposes, the first outer mold 2 and the second outer mold 3 are matched and connected in different modes, the first assembly hole 20 of the first outer mold 2 is opposite to the second assembly hole 30 of the second outer mold 3, the butted first inner mold 10 and the butted second inner mold 11 extend into the assembly holes to corresponding positions, the first outer mold 2 and the first inner mold 10 are fixedly connected through the second fixing screw rod 23, the second outer mold 3 and the second inner mold 11 are fixedly connected through the third fixing screw rod 33, a universal testing machine is started, and a test is carried out.
In the third step, the first outer die 2 and the second outer die 3 have two matching connection modes:
A. when an interface static and dynamic shear test is required, the convex block 25 of the first outer die 2 is matched and connected with the sliding groove 35 of the second outer die 3, when the first assembly hole 20 of the first outer die 2 is aligned with the second assembly hole 30 of the second outer die 3, the height position of the bottom surface of the first outer die 2 is lower than that of the bottom surface of the second outer die 3, and the height position of the top surface of the first outer die 2 is lower than that of the top surface of the second outer die 3, after the first inner die 10 and the second inner die 11 are assembled, two loading heads of a universal testing machine are respectively contacted with the bottom surface of the first outer die 2 and the top surface of the second outer die 3 to carry out static and dynamic loading, the contact surface of the first outer die 2 and the second outer die 3 and a bonding interface are on the same plane, when the shear force is applied by the universal testing machine, the bending moment generated during the asymmetric loading of the upper surface and the lower surface can be eliminated by the matching and connecting structure of the sliding groove 35 of the convex block 25 of the dovetail type, the bonding interface of two test pieces in the test piece unit 1 only receives the shear force, the accuracy and the validity of the test result are ensured;
B. when an interface static and dynamic tensile test is required to be carried out, the top surface of the second outer die 3 faces the direction of the bottom surface of the first outer die 2, so that the first assembly hole 20 of the first outer die 2 is opposite to the second assembly hole 30 of the second outer die 3, after the first inner die 10 and the second inner die 11 are assembled and fixed, the top surface of the second outer die 3 faces the horizontal direction, and two clamps of a universal testing machine respectively clamp the first outer die 2 and the second outer die 3 for static and dynamic loading; because of the arrangement characteristics of the four 112 mounting holes and the seven 32 mounting holes, the second outer die 3 can still be effectively assembled and connected with the second inner die 11 after rotating for 180 degrees, the clamping action force of the clamp of the universal testing machine is completely borne by the first outer die 2 and the second outer die 3, the bonding interface of the two test pieces of the test piece unit 1 is only stressed by the tensile force, and the accuracy and the validity of the test result are ensured.
When two different tests are carried out on the same bonding interface, the corresponding second fixing screw 23 and the corresponding second nut 24, and the corresponding third fixing screw 33 and the corresponding third nut 34 are disassembled, the first inner die 10 and the second inner die 11 of the original test piece unit 1 are taken down, the connecting position of the second outer die 3 is changed, and a new test piece unit 1 is installed again.
The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.
Claims (9)
1. An interfacial adhesion static and dynamic performance test device, comprising:
the test piece unit comprises a first inner die and a second inner die which are butted in end faces, and the first test piece and the second test piece with bonding interfaces are respectively arranged in the first inner die and the second inner die;
the first outer die is provided with a first assembling hole, the first inner die is detachably connected in the first assembling hole, and a convex block is formed on the end face, facing the second inner die, of the first outer die in a protruding mode;
the second outer die is provided with a second assembling hole, the second inner die is detachably connected into the second assembling hole, a sliding groove matched with the bump is formed on the end face, facing the first inner die, of the second outer die, and the length of the sliding groove is larger than that of the bump;
when the convex block is matched and connected with the sliding groove, the height position of the first bottom surface of the outer die is lower than that of the second bottom surface of the outer die, and the height position of the first top surface of the outer die is lower than that of the second top surface of the outer die.
2. The interfacial adhesion static and dynamic performance test device of claim 1, wherein:
a first side opening is formed in one side surface of the inner die close to the second inner die;
two corresponding side surfaces of the inner die are provided with a second side opening near the first inner die;
the test piece unit further comprises a baffle plate, the baffle plate is arranged at the first side opening and the second side opening in a matched mode, and the baffle plate is detachably connected with the first inner die and the second inner die.
3. The interfacial adhesion static and dynamic performance test device of claim 2, wherein:
the first side opening is provided with two positions which are respectively arranged on two opposite side surfaces of the first inner die;
the second side opening is provided with two positions which are respectively arranged on two opposite side surfaces of the second inner die;
the baffle has two.
4. The interfacial adhesion static and dynamic performance test apparatus according to claim 3, wherein: the first inner die and the second inner die are in the same shape and are symmetrically arranged, and the first inner die and the second inner die are in square tube shapes with openings at two ends.
5. The interfacial adhesion static and dynamic performance test device of claim 4, wherein:
a side surface of the first outer die, which corresponds to the first opening on one side of the inner die, is also provided with a third opening with the same shape;
and the side surface of the second outer die, which corresponds to the second openings on the two sides of the inner die, is also provided with a fourth opening with the same shape.
6. The interfacial adhesion static and dynamic performance test device of claim 1, wherein:
the convex block of the first outer die is a dovetail convex;
the sliding grooves of the outer die II are in matched dovetail-shaped depressions.
7. The interfacial adhesion static and dynamic performance test device of claim 1, wherein:
a first mounting hole is formed through the side wall of one edge of the inner die, the first mounting hole is provided with two positions, and the first mounting hole is symmetrically formed in the top and the bottom of the first inner die;
a third mounting hole is formed through the side wall of the edge of the second inner die, the third mounting hole is provided with two positions, and the third mounting hole is symmetrically formed in the top and the bottom of the second inner die;
a mounting hole six is formed in the position, corresponding to the mounting hole, of the outer die I in a penetrating mode, and the outer die I is fixedly connected with the inner die I through the mounting hole six and the mounting hole I by the aid of a fixing screw rod II;
a mounting hole seventh is formed in the outer die II in a penetrating mode at a position corresponding to the mounting hole, and the outer die II and the inner die II are fixedly connected through a fixing screw rod III penetrating through the mounting hole seventh and the mounting hole III.
8. An interface bonding static and dynamic performance test method is based on the interface bonding static and dynamic performance test device of any one of claims 1 to 7, and is characterized by comprising the following steps:
firstly, preparing a test piece:
a1, preparing a first test piece, namely installing a baffle at a first side opening of a first inner mould, pouring concrete material into the first inner mould until the baffle is flush with one end face of the first inner mould to form the first test piece;
a2, preparing a second test piece, after the first test piece is maintained, butting and fixing the second inner mold with the second inner mold through a baffle, pouring other materials into the second inner mold until the materials are flush with the two end surfaces of the second inner mold to form the second test piece;
secondly, preparation before testing:
after the test piece II is molded, the baffle is removed, and a strain gauge is pasted or a grid graph for identifying DIC equipment is drawn on the bonding interface exposed at the positions of the first side opening and the second side opening;
thirdly, static and dynamic performance test:
according to different test purposes, the first outer die and the second outer die are matched and connected in different modes, the first outer die is just opposite to the second outer die, the first butted inner die and the second butted inner die extend into the assembly holes to corresponding positions, the first outer die and the first inner die are fixedly connected through the second fixed screw rod, the second outer die and the second inner die are fixedly connected through the third fixed screw rod, and a universal testing machine is started to perform tests.
9. The method for testing static and dynamic performance of interfacial adhesion according to claim 8, wherein in the third step, the first outer mold and the second outer mold have two matching connection modes:
A. when an interface static and dynamic shear test is required, a convex block of the first outer die is matched and connected with a sliding groove of the second outer die, when a first assembly hole of the first outer die is aligned with a second assembly hole of the second outer die, the height position of the bottom surface of the first outer die is lower than that of the bottom surface of the second outer die, and the height position of the top surface of the first outer die is lower than that of the top surface of the second outer die;
B. when interface static and dynamic tensile test needs to be carried out, the top surface of the outer die II faces to the direction of the bottom surface of the outer die I, the first assembling hole of the outer die I is just opposite to the second assembling hole of the outer die II, after the inner die I and the inner die II are assembled to be fixed, the top surface of the outer die II is arranged towards the horizontal direction, and two clamps of the universal testing machine respectively clamp the outer die I and the outer die II to carry out static and dynamic loading.
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