A fixture and equipment for adhesive shear testing of sandwich structure test specimens.

Abstract

This utility model discloses a fixture and equipment for bonding shear testing of sandwich structure test specimens, relating to the technical field of composite material testing equipment. The fixture for bonding shear testing of sandwich structure test specimens includes a loading plate assembly, a bonding mechanism, and a loading mechanism. This facilitates the fixing of the first and second loading plates to both sides of the sandwich structure test specimen by bonding, enabling rapid bonding of the sandwich structure test specimen to the first and second loading plates without the need for autoclave bonding. The fixture and equipment provided by this utility model for bonding shear testing of sandwich structure test specimens reduce costs, enable rapid bonding, shorten the cycle time, and improve overall testing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of composite material testing equipment, and in particular to a fixture and equipment for bonding shear testing of sandwich structure test specimens. Background Technology

[0002] Composite sandwich structures are widely used in aircraft airframe structures, such as interior flooring, rudders, and elevators. Assessing the shear performance of sandwich structures has always been a key concern in typical structural design and tolerance assessments. International standards have been established for this purpose. However, specific methods for bonding the test specimen to the fixture are not provided.

[0003] Currently, the common method for bonding test pieces and fixtures is to use adhesive film for autoclave bonding, which is costly and has a long implementation cycle, resulting in low overall testing efficiency.

[0004] Therefore, there is an urgent need for a fixture and equipment for bonding shear tests on sandwich structure test specimens to solve the above problems. Utility Model Content

[0005] The first objective of this invention is to provide a fixture for bonding shear testing of sandwich structure test specimens, in order to solve the problems of high cost, long implementation cycle, and low overall testing efficiency in the prior art.

[0006] The second objective of this invention is to provide a device for bonding shear testing of sandwich structure test specimens, which shortens the cycle and improves the overall testing efficiency.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A fixture for adhesive shear testing of sandwich structure specimens, comprising:

[0009] A loading plate assembly, comprising a first loading plate and a second loading plate;

[0010] An adhesive bonding mechanism includes an adhesive component, multiple first connecting components, and multiple second connecting components. The adhesive component is used to bond the sandwich structure test specimen between a first loading plate and a second loading plate. In the width direction of the loading plate group, the multiple first connecting components are respectively located at both ends of the loading plate group. One end of each first connecting component is detachably connected to the first loading plate, and the other end is detachably connected to the second loading plate. Each of the multiple second connecting components includes a U-shaped pressure plate and an elastic element. The elastic element is installed between the middle plate of the U-shaped pressure plate and the first loading plate. The end of the elastic element away from the middle plate abuts against the first loading plate. Two parallel support plates of the U-shaped pressure plate are detachably connected to both sides of the second loading plate.

[0011] The loading mechanism includes two loading components, each of which includes a loading connecting plate and a loading column. One end of each loading connecting plate is detachably connected to a first loading plate and a second loading plate, respectively, and the other end of each loading connecting plate is detachably connected to one end of each loading column. The other end of each loading column is used to connect to a tensile testing machine.

[0012] Furthermore, along the length of the first loading plate, a plurality of second connecting components are evenly spaced apart; and a plurality of first connecting components on the side of the first loading plate are spaced apart.

[0013] Furthermore, the second connecting component includes a plurality of elastic elements and a plurality of first fixing elements, with the plurality of first fixing elements corresponding one-to-one with the plurality of elastic elements. The first fixing elements can fix the corresponding elastic elements between the intermediate plate and the first loading plate. The intermediate plate is located between the two support plates. The plurality of elastic elements are spaced apart in the width direction of the first loading plate.

[0014] Furthermore, one end of the first loading plate and one end of the second loading plate are each provided with a plurality of first connecting holes, and one end of the loading connecting plate is provided with a plurality of second connecting holes. The plurality of first connecting holes and the plurality of second connecting holes are provided in a one-to-one correspondence, and the first connecting holes and the corresponding second connecting holes are connected by a second fastener.

[0015] Furthermore, a positioning groove is provided at one end of the first loading plate and one end of the second loading plate, and a plurality of first connecting holes are spaced apart from the positioning groove. A positioning protrusion is also provided at one end of the loading connecting plate, and the positioning protrusion can be located in the positioning groove.

[0016] Furthermore, the loading mechanism also includes a first extensometer mounting assembly and a second extensometer mounting assembly arranged at intervals. The second extensometer mounting assembly can be detachably connected to one side of the loading plate assembly. Both the first extensometer mounting assembly and the second extensometer mounting assembly include a mounting block and an extensometer positioning pin.

[0017] In the first extensometer mounting assembly, one end of the mounting block is detachably connected to the first loading plate, and the other end is detachably connected to the second loading plate. The extensometer positioning pin is connected to the side of the mounting block and located between the first loading plate and the second loading plate.

[0018] In the second extensometer mounting assembly, one end of the mounting block is detachably connected to the second loading plate, and the other end is connected to the first detachable loading plate. The extensometer positioning pin is connected to the side of the mounting block and is located between the first loading plate and the second loading plate.

[0019] Furthermore, the axes of the two extensometer positioning pins coincide, and both extensometer positioning pins are provided with annular grooves.

[0020] Furthermore, a circular through hole is provided at one end of the mounting block, and two elongated holes are provided at a distance from the other end of the mounting block, with the length direction of the two elongated holes being parallel to the length direction of the mounting block.

[0021] Furthermore, the first connecting assembly includes a connecting plate with an elongated hole and two first connecting members. Both first connecting members can pass through the elongated hole and abut against the connecting plate. The two first connecting members can be connected to a first loading plate and a second loading plate, respectively.

[0022] An apparatus for bonding shear testing of sandwich structure test specimens includes an extensometer, a tensile testing machine, and a fixture for bonding shear testing of sandwich structure test specimens, wherein the tensile testing machine is detachably connected to the other end of a loading column.

[0023] The beneficial effects of this utility model are:

[0024] This utility model provides a fixture for bonding and shear testing of sandwich structure test specimens, including a loading plate assembly, a bonding mechanism, and a loading mechanism. The loading plate assembly includes a first loading plate and a second loading plate. The bonding mechanism includes an adhesive component, multiple first connecting components, and multiple second connecting components. The adhesive component is used to bond the sandwich structure test specimen to the space between the first and second loading plates. In the width direction of the loading plate assembly, the multiple first connecting components are located at both ends of the loading plate assembly. One end of each first connecting component is detachably connected to the first loading plate, and the other end is detachably connected to the second loading plate. Each of the multiple second connecting components includes a U-shaped pressure plate and an elastic component. The elastic component is installed between the middle plate of the U-shaped pressure plate and the first loading plate. The end of the elastic component away from the middle plate abuts against the first loading plate. Two parallel support plates of the U-shaped pressure plate are detachably connected to both sides of the second loading plate. The loading mechanism includes two loading components, each of which includes a loading connecting plate and a loading column. One end of each loading connecting plate is detachably connected to a first loading plate and a second loading plate, respectively. The other end of each loading connecting plate is detachably connected to one end of each loading column, and the other end of the loading column is used to connect to a tensile testing machine. With the above configuration, the adhesive component is used to bond the sandwich structure test specimen to the first loading plate and the second loading plate. One end of the first connecting component is detachably connected to the first loading plate, and the other end is detachably connected to the second loading plate. The second connecting component includes a U-shaped pressure plate and an elastic component. The elastic component is installed between the middle plate of the U-shaped pressure plate and the first loading plate. The end of the elastic component away from the middle plate abuts against the first loading plate. The two parallel support plates of the U-shaped pressure plate are detachably connected to both sides of the second loading plate. The first connecting component, in conjunction with the second connecting component, can position and pressurize the first and second loading plates, thereby realizing the positioning and pressurization between the first and second loading plates and the sandwich structure test specimen. This facilitates the fixing of the first and second loading plates to both sides of the sandwich structure test specimen by adhesive, enabling rapid bonding of the sandwich structure test specimen to the first and second loading plates without the need for autoclave bonding, reducing costs, enabling rapid bonding, shortening the cycle, and improving overall testing efficiency. Furthermore, both the first and second connecting components are connected to the edges of the first and second loading plates, which can prevent the sandwich structure test piece and the first and second loading plates from slipping along their width direction, thus improving the bonding accuracy. The elastic element can provide continuous pressure, which can keep the overall structure in a compressed state when the thickness of the bonded part changes, thereby improving the bonding effect between the first and second loading plates and the sandwich structure test piece.

[0025] This embodiment also provides an apparatus for bonding shear testing of sandwich structure test specimens, including an extensometer, a tensile testing machine, and the aforementioned fixture for bonding shear testing of sandwich structure test specimens. The tensile testing machine is detachably connected to the other end of the loading column, which improves the bonding speed between the sandwich structure test specimen and the first loading plate and the second loading plate, shortens the cycle, and improves the overall testing efficiency. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the bonding mechanism and loading plate assembly of a fixture for bonding and shearing tests of sandwich structure test specimens provided in this embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the loading mechanism and loading plate assembly of a fixture for bonding and shearing tests of sandwich structure test specimens provided in this embodiment of the present invention.

[0029] In the picture:

[0030] 1. First loading plate; 2. Second loading plate; 3. First connecting assembly; 4. Second connecting assembly; 41. U-shaped pressure plate; 411. Support plate; 412. Intermediate plate; 42. Elastic element; 43. First fixing element; 5. Loading connecting plate; 51. First body; 52. Second body; 6. Loading column; 7. Mounting block; 8. Extensometer positioning pin; 100. Sandwich structure test piece. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] This invention provides a fixture for bonding and shear testing of sandwich structure test specimens, which facilitates rapid bonding of the sandwich structure test specimens to the first and second loading plates without the need for autoclave bonding, thus reducing costs, enabling rapid testing, shortening the cycle, and improving overall testing efficiency.

[0036] like Figures 1-2As shown, in this embodiment, the fixture for the bonding shear test of the sandwich structure test specimen includes a loading plate assembly, a bonding mechanism, and a loading mechanism. The loading plate assembly includes a first loading plate 1 and a second loading plate 2. The bonding mechanism includes an adhesive component, multiple first connecting components 3, and multiple second connecting components 4. The adhesive component is used to bond the sandwich structure test specimen 100 to the space between the first loading plate 1 and the second loading plate 2. In the width direction of the loading plate assembly, the multiple first connecting components 3 are located at both ends of the loading plate assembly. One end of the first connecting component 3 is detachably connected to the first loading plate 1, and the other end is detachably connected to the second loading plate 2. Each of the multiple second connecting components 4 includes a U-shaped pressure plate 41 and an elastic element 42. The elastic element 42 is installed between the middle plate 412 of the U-shaped pressure plate 41 and the first loading plate 1. The end of the elastic element 42 away from the middle plate 412 abuts against the first loading plate 1. The two parallel support plates 411 of the U-shaped pressure plate 41 are detachably connected to both sides of the second loading plate 2. The loading mechanism includes two loading components, each including a loading connecting plate 5 and a loading column 6. One end of each loading connecting plate 5 is detachably connected to a first loading plate 1 and a second loading plate 2, respectively. The other end of each loading connecting plate 5 is detachably connected to one end of each loading column 6, and the other end of the loading column 6 is used to connect to a tensile testing machine. It is understood that, through the above arrangement, the adhesive is used to bond the sandwich structure test specimen 100 between the first loading plate 1 and the second loading plate 2. One end of the first connecting component 3 is detachably connected to the first loading plate 1, and the other end is detachably connected to the second loading plate 2. The second connecting component 4 includes a U-shaped pressure plate 41 and an elastic element 42. The elastic element 42 is installed between the middle plate 412 of the U-shaped pressure plate 41 and the first loading plate 1. The end of the elastic element 42 away from the middle plate 412 abuts against the first loading plate 1. Two parallel support plates 411 of the U-shaped pressure plate 41 are detachably connected to both sides of the second loading plate 2. The first connecting component 3 cooperates with... The second connecting component 4 can position and pressurize the first loading plate 1 and the second loading plate 2, thereby improving the positioning and pressurization between the first loading plate 1 and the second loading plate 2 and the sandwich structure test piece 100. This facilitates the first loading plate 1 and the second loading plate 2 to be fixed to both sides of the sandwich structure test piece 100 by bonding, enabling rapid bonding between the sandwich structure test piece 100 and the first loading plate 1 and the second loading plate 2. This eliminates the need for autoclave bonding, reducing costs and enabling rapid bonding, shortening the cycle and improving overall testing efficiency.Furthermore, both the first connecting component 3 and the second connecting component 4 are connected to the side edges of the first loading plate 1 and the second loading plate 2, which can prevent the sandwich structure test piece 100 and the first loading plate 1 and the second loading plate 2 from slipping along their width direction, thus improving the bonding accuracy. The elastic element 42 can provide continuous pressure, which can keep the overall structure in a compressed state when the thickness of the adhesive changes, thereby improving the bonding effect between the first loading plate 1 and the second loading plate 2 and the sandwich structure test piece 100. In this embodiment, the adhesive can be an adhesive or a pre-cut adhesive film.

[0037] Furthermore, it can be conceivable that one end of each of the two loading connecting plates 5 is detachably connected to the first loading plate 1 and the second loading plate 2, respectively, and the other end of each of the two loading connecting plates 5 is detachably connected to one end of each of the two loading columns 6. The other end of the loading column 6 is used to connect to a tensile testing machine, facilitating the connection of the fixture used for the bonding shear test of the sandwich structure specimen to the tensile testing machine. In this embodiment, the other end of the loading column 6 is detachably connected to the tensile testing machine, and both the loading connecting plates 5 and the loading columns 6 can be made of stainless steel.

[0038] It should be noted that the sandwich structure test specimen 100 is plate-shaped and can be made of stainless steel or aluminum. The thickness of the sandwich structure test specimen 100 is 8mm-20mm to ensure the rigidity and strength of the structure, while avoiding excessive weight. During bonding, the length direction of the sandwich structure test specimen 100 is parallel to the length directions of the first loading plate 1 and the second loading plate 2. The first loading plate 1 and the second loading plate 2 can be loading plates of the same structure and are arranged parallel to each other.

[0039] In this embodiment, the sandwich structure test piece 100 has uniform micro-uneven structures at both ends in its thickness direction. The side of the first loading plate 1 facing the sandwich structure test piece 100 and the side of the second loading plate 2 facing the sandwich structure test piece 100 also have uniform micro-uneven structures, which can improve the roughness of the contact surfaces between the sandwich structure test piece 100, the first loading plate 1, and the second loading plate 2 and the adhesive, thus facilitating the improvement of the bonding effect.

[0040] To facilitate the connection of the first loading plate 1 and the second loading plate 2 with the first connecting assembly 3, the second connecting assembly 4, the first extensometer mounting assembly, and the second extensometer mounting assembly, respectively, multiple threaded holes are provided on both sides of the first loading plate 1 along its length, and multiple threaded holes are also provided on both sides of the second loading plate 2. Specifically, the multiple threaded holes on one side of the first loading plate 1 correspond one-to-one with the multiple threaded holes on the other side, and the threaded holes on one side of the first loading plate 1 are coaxially arranged with the corresponding threaded holes on the other side. Similarly, the multiple threaded holes on one side of the second loading plate 2 correspond one-to-one with the multiple threaded holes on the other side, and the threaded holes on one side of the second loading plate 2 are coaxially arranged with the corresponding threaded holes on the other side.

[0041] Furthermore, multiple second connecting components 4 are evenly spaced along the length of the first loading plate 1. It is understood that the multiple second connecting components 4 are evenly spaced, and can abut against different positions of the first loading plate 1 and connect to different positions of the second loading plate 2. This facilitates improved stability between the first loading plate 1 and the second loading plate 2, preventing misalignment between the first loading plate 1, the second loading plate 2, and the sandwich structure test piece 100.

[0042] Furthermore, multiple first connecting components 3 are spaced apart on the side of the first loading plate 1. It is understood that the spaced arrangement of multiple first connecting components 3 facilitates further improvement in the stability of the connection between the first loading plate 1 and the second loading plate 2. Moreover, the spaced arrangement of multiple first connecting components 3 and the uniformly spaced arrangement of multiple second connecting components 4 can form multiple blocking parts on the side of the first loading plate 1 and the second loading plate 2, thereby preventing the sandwich structure test piece 100 and the first loading plate 1 and the second loading plate 2 from slipping in the width direction.

[0043] For example, such as Figure 1 As shown, the second connecting component 4 includes multiple elastic elements 42 and multiple first fixing elements 43. The multiple first fixing elements 43 are correspondingly arranged with the multiple elastic elements 42. The first fixing elements 43 can fix the corresponding elastic element 42 between the intermediate plate 412 and the first loading plate 1. The intermediate plate 412 is located between two support plates 411. The multiple elastic elements 42 are spaced apart in the width direction of the first loading plate 1. It can be understood that fixing the elastic element 42 to the intermediate plate 412 of the U-shaped pressure plate 41 by the first fixing elements 43 facilitates the U-shaped pressure plate 41 fitting onto the first loading plate 1 and the second loading plate 2, and facilitates the contact between the elastic element 42 and the first loading plate 1. In this embodiment, the intermediate plate 412 of the U-shaped pressure plate 41 has a threaded hole, through which a bolt passes. The elastic element 42 is a spring 42, fitted onto the bolt's thread. One end of the spring 42 abuts against the first loading plate 1, and the other end abuts against the plane connecting the bolt's thread and the bolt head.

[0044] Of course, in other embodiments, one end of a plurality of elastic elements 42 may be welded to an intermediate plate 412 to achieve the installation of the elastic elements 42.

[0045] In this embodiment, the second connecting component 4 further includes bolts. The support plate 411 is provided with threaded holes. The bolts can pass through and be fixed to the threaded holes on the support plate 411 and the threaded holes on the second loading plate 2 to achieve a detachable connection between the support plate 411 and the second connecting component 4.

[0046] Furthermore, each end of the first loading plate 1 and the second loading plate 2 is provided with a plurality of first connecting holes, and each end of the loading connecting plate 5 is provided with a plurality of second connecting holes. The plurality of first connecting holes and the plurality of second connecting holes are arranged one-to-one, and the first connecting holes and their corresponding second connecting holes are connected by a second fastener. It can be understood that by providing a plurality of second connecting holes on the loading connecting plate 5, and a plurality of first connecting holes on each end of the first loading plate 1 and the second loading plate 2, the connection between the first loading plate 1 and the second loading plate 2 and the loading connecting plate 5 is facilitated. In this embodiment, both the first and second connecting holes are threaded holes, and the second fastener can be a bolt.

[0047] For example, such as Figure 2 As shown, a positioning groove is provided at one end of the first loading plate 1 and one end of the second loading plate 2. Multiple first connecting holes are spaced apart from the positioning grooves. A positioning protrusion is also provided at one end of the loading connecting plate 5, and the positioning protrusion can be located within the positioning groove. It can be understood that by providing the positioning groove and the positioning protrusion that cooperates with the positioning groove, the stability of the angle of the loading connecting plate 5 relative to the first loading plate 1 and the second loading plate 2 can be further limited. Combined with the first connecting holes, the second connecting holes, and the second fixing member, the stability of the connection between the loading connecting plate 5 and the first loading plate 1 and the second loading plate 2 can be improved. In this embodiment, the positioning groove is a rectangular groove, the length of which is equal to the width of the first loading plate 1, and the length direction of the positioning groove is parallel to the width direction of the first loading plate 1.

[0048] In this embodiment, the loading connection plate 5 includes a hinged first body 51 and a second body 52. ​​A positioning protrusion and a second connecting hole are provided on the first body 51. The second body 52 is connected to the loading column 6 and facilitates the adjustment of the load loading angle.

[0049] Furthermore, in the thickness direction of the first loading plate 1, the projections of the first loading plate 1 and the second loading plate 2 largely overlap, that is, the first loading plate 1 and the second loading plate 2 are not completely aligned in the thickness direction of the first loading plate 1. One end of the first loading plate 1 and one end of the second loading plate 2 are located outside the overlapping part, which facilitates the connection of the loading connecting plate 5 with the first loading plate 1 and the second loading plate 2.

[0050] Furthermore, the loading mechanism also includes a first extensometer mounting assembly and a second extensometer mounting assembly spaced apart, both of which are detachably connected to one side of the loading plate assembly. Both the first and second extensometer mounting assemblies include a mounting block 7 and an extensometer positioning pin 8. It is understood that by providing the first and second extensometer mounting assemblies, it is convenient to install the two extensometer positioning pins 8 and to connect the two extensometers.

[0051] Specifically, in the first extensometer mounting assembly, one end of the mounting block 7 is detachably connected to the first loading plate 1, and the other end is detachably connected to the second loading plate 2. The extensometer positioning pin 8 is connected to the side of the mounting block 7 and located between the first loading plate 1 and the second loading plate 2. In the second extensometer mounting assembly, one end of the mounting block 7 is detachably connected to the second loading plate 2, and the other end is connected to the first loading plate. The extensometer positioning pin 8 is connected to the side of the mounting block 7 and located between the first loading plate 1 and the second loading plate 2. It can be understood that the two mounting blocks 7 are set in opposite directions, thereby making the two extensometer positioning pins 8 relatively opposite, so that the two extensometer positioning pins 8 are simultaneously oriented towards the center of the sandwich structure test piece 100.

[0052] Furthermore, the axes of the two extensometer positioning pins 8 coincide, and both extensometer positioning pins 8 have annular grooves. It is understandable that coinciding the axes of the two extensometer positioning pins 8 can improve testing accuracy, and the annular grooves facilitate the connection of the extensometer's measuring claws.

[0053] Furthermore, one end of the mounting block 7 has a circular through hole, and the other end of the mounting block 7 has two elongated holes spaced apart, with the length direction of the two elongated holes parallel to the length direction of the mounting block 7. Specifically, both the first extensometer mounting assembly and the second extensometer mounting assembly include two bolts. In the first extensometer mounting assembly, one bolt can pass through and be fixed to the circular through hole and the threaded hole on the side of the second loading plate 2, and the other bolt can pass through and be fixed to one of the elongated holes and the threaded hole on the side of the first loading plate 1. In the second extensometer mounting assembly, one bolt can pass through and be fixed to the circular through hole and the threaded hole on the side of the first loading plate 1, and the other bolt can pass through and be fixed to one of the elongated holes and the threaded hole on the side of the second loading plate 2. This facilitates the detachable connection of the first extensometer mounting assembly and the second extensometer mounting assembly to the first loading plate 1 and the second loading plate 2, respectively. At the same time, the position of the mounting block 7 relative to the first loading plate 1 or the second loading plate 2 can be adjusted using the elongated holes, facilitating the centering and alignment of the two extensometer positioning pins 8.

[0054] Furthermore, the first connecting assembly 3 includes a connecting plate with an elongated hole and two first connecting members. Both first connecting members can pass through the elongated hole and abut against the connecting plate. The two first connecting members can be respectively connected to the first loading plate 1 and the second loading plate 2. It is understood that by providing the elongated hole and the two first connecting members, it is convenient to adjust the relative positions of the first loading plate 1 and the second loading plate 2. In this embodiment, the first connecting member is a bolt. The first connecting member can pass through and be fixed to the elongated hole and the threaded hole on the side of the second loading plate 2, and the first connecting member can also pass through and be fixed to the elongated hole and the threaded hole on the side of the first loading plate 1, thereby achieving a detachable connection between the first connecting assembly 3 and the first loading plate 1 and the second loading plate 2.

[0055] This embodiment also provides an apparatus for bonding shear tests of sandwich structure test specimens, which improves the bonding speed between the sandwich structure test specimen 100 and the first loading plate 1 and the second loading plate 2, shortens the cycle, and improves the overall testing efficiency of the apparatus.

[0056] In this embodiment, the equipment for the adhesive shear test of the sandwich structure specimen includes an extensometer, a tensile testing machine, and the aforementioned fixture for the adhesive shear test of the sandwich structure specimen. The tensile testing machine is detachably connected to the other end of the loading column 6. Specifically, the extensometer is connected to the extensometer positioning pin 8. It can be understood that by connecting the tensile testing machine to the other end of the two loading columns 6, the adhesive shear test of the sandwich structure specimen 100 can be performed from both sides. The extensometer is connected to the extensometer positioning pin 8 and is also connected to the data acquisition device, and a loading test is performed according to the test requirements. Of course, the extensometer can also be fixed in place by a rubber band to obtain the strain during the mechanical test and then calculate the shear modulus. The type of extensometer, the connection method between the extensometer and the data acquisition device, and the calculation method of the shear modulus are all existing technologies and are not the focus of this embodiment, so no specific limitations are made thereto.

[0057] The usage process of the equipment for bonding shear testing of sandwich structure test specimens provided in this embodiment is as follows:

[0058] First, clean the surfaces of the first loading plate 1, the second loading plate 2, and the sandwich structure test piece 100 to ensure that there is no dust, grease, or other debris on the surface. Wipe them with acetone or alcohol and let them dry.

[0059] Then, the sandwich structure test piece 100 is positioned, the adhesive 2 is evenly covered on both sides of the sandwich structure test piece 100 in its thickness direction, and then the sandwich structure test piece 100 is aligned with the first loading plate 1 and the second loading plate 2 according to the previously positioned positions.

[0060] Then, the first connecting component 3 and the second connecting component 4 are connected to the first loading plate 1 and the second loading plate 2. After the adhesive 2 has completely cured, the first connecting component 3 and the second connecting component 4 are removed, and the bonding is completed.

[0061] Then, the bonded first loading plate 1 and second loading plate 2 are connected to the loading mechanism, and the first extensometer mounting assembly and the second extensometer mounting component are installed. The position of the mounting block 7 is adjusted through the elongated hole to center and align the positioning pins of the two extensometers. Then, the extensometers are installed on the tensile testing machine through the loading column 6 and connected.

[0062] Finally, the extensometer is connected to the data acquisition equipment, which can perform load tests according to the experimental requirements.

[0063] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A jig for a bonded shear test of a sandwich structure test piece, characterized by, include: A loading plate assembly, comprising a first loading plate (1) and a second loading plate (2); The bonding mechanism includes an adhesive, a plurality of first connecting components (3) and a plurality of second connecting components (4). The adhesive is used to bond the sandwich structure test piece (100) to the first loading plate (1) and the second loading plate (2). In the width direction of the loading plate group, the plurality of first connecting components (3) are respectively located at both ends of the loading plate group. One end of the first connecting component (3) is detachably connected to the first loading plate (1) and the other end is detachably connected to the second loading plate (2). The plurality of second connecting components (4) each include a U-shaped pressure plate (41) and an elastic element (42). The elastic element (42) is installed between the middle plate (412) of the U-shaped pressure plate (41) and the first loading plate (1). The two parallel support plates (411) of the U-shaped pressure plate (41) are detachably connected to the two sides of the second loading plate (2). The loading mechanism includes two loading components, each of which includes a loading connecting plate (5) and a loading column (6). One end of each of the two loading connecting plates (5) is detachably connected to a first loading plate (1) and a second loading plate (2), respectively. The other end of each of the two loading connecting plates (5) is detachably connected to one end of each of the two loading columns (6), and the other end of each loading column (6) is used to connect to a tensile testing machine.

2. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 1, characterized in that, Along the length of the first loading plate (1), a plurality of second connecting components (4) are evenly spaced; and a plurality of first connecting components (3) on the side of the first loading plate (1) are spaced apart.

3. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 1, characterized in that, The second connecting component (4) includes a plurality of elastic elements (42) and a plurality of first fixing elements (43). The plurality of first fixing elements (43) are arranged in a one-to-one correspondence with the plurality of elastic elements (42). The first fixing elements (43) can fix the corresponding elastic elements (42) between the intermediate plate (412) and the first loading plate (1). The intermediate plate (412) is located between the two support plates (411). The plurality of elastic elements (42) are spaced apart in the width direction of the first loading plate (1).

4. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 1, characterized in that, One end of the first loading plate (1) and one end of the second loading plate (2) are provided with a plurality of first connecting holes, and one end of the loading connecting plate (5) is provided with a plurality of second connecting holes. The plurality of first connecting holes and the plurality of second connecting holes are provided in a one-to-one correspondence. The first connecting holes and the corresponding second connecting holes are connected by a second fastener.

5. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 4, characterized in that, A positioning groove is provided at one end of the first loading plate (1) and at one end of the second loading plate (2). Multiple first connecting holes are spaced apart from the positioning groove. A positioning protrusion is also provided at one end of the loading connecting plate (5). The positioning protrusion can be located in the positioning groove.

6. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 1, characterized in that, The loading mechanism also includes a first extensometer mounting assembly and a second extensometer mounting assembly arranged at intervals. The second extensometer mounting assembly can be detachably connected to one side of the loading plate assembly. Both the first extensometer mounting assembly and the second extensometer mounting assembly include a mounting block (7) and an extensometer positioning pin (8). In the first extensometer mounting assembly, one end of the mounting block (7) is detachably connected to the first loading plate (1), and the other end is detachably connected to the second loading plate (2). The extensometer positioning pin (8) is connected to the side of the mounting block (7) and located between the first loading plate (1) and the second loading plate (2). In the second extensometer mounting assembly, one end of the mounting block (7) is detachably connected to the second loading plate (2), and the other end is connected to the first loading detachable plate. The extensometer positioning pin (8) is connected to the side of the mounting block (7) and located between the first loading plate (1) and the second loading plate (2).

7. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 6, characterized in that, The axes of the two extensometer positioning pins (8) coincide, and both extensometer positioning pins (8) are provided with annular grooves.

8. The fixture for adhesive shear testing of sandwich structure test specimens according to claim 6, characterized in that, One end of the mounting block (7) has a circular through hole, and the other end of the mounting block (7) has two elongated holes spaced apart. The length direction of the two elongated holes is parallel to the length direction of the mounting block (7).

9. The fixture for adhesive shear testing of sandwich structure test specimens according to any one of claims 1-8, characterized in that, The first connecting component (3) includes a connecting plate with an elongated hole and two first connecting members. Both first connecting members can pass through the elongated hole and abut against the connecting plate. The two first connecting members can be connected to the first loading plate (1) and the second loading plate (2) respectively.

10. An apparatus for bonding shear testing of sandwich structure specimens, characterized in that, Includes an extensometer, a tensile testing machine, and a fixture for bonding shear testing of sandwich structure test specimens as described in any one of claims 1-9, wherein the tensile testing machine is detachably connected to the other end of the loading column (6).

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