CN109883818B - Clamp suitable for metal plate tensile DIC test - Google Patents
Clamp suitable for metal plate tensile DIC test Download PDFInfo
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- CN109883818B CN109883818B CN201910142580.0A CN201910142580A CN109883818B CN 109883818 B CN109883818 B CN 109883818B CN 201910142580 A CN201910142580 A CN 201910142580A CN 109883818 B CN109883818 B CN 109883818B
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Abstract
The invention provides a clamp suitable for metal plate tensile DIC (digital computer) testing, which comprises an inner clamp and an outer clamp, wherein the outer clamp comprises an outer clamping block (1), the inner clamp comprises an inner clamping block (2), a plurality of inner clamping blocks (2) are mutually matched to clamp a sample, a plurality of outer clamping blocks (1) are mutually matched to clamp the inner clamping blocks (2), and the outer clamp and the inner clamp are mutually matched with the inner side surface of the outer clamping block (1) through the opposite surface of the clamping surface of the inner clamping block (2) to clamp the sample. According to the invention, through the arrangement of the inner clamping block and the outer clamping block, the change of the placing direction of the sample is realized, the plane of the sample is vertical to the observation direction, and the DIC camera is convenient to observe the deformation condition in the recording plate surface during the test. The clamping is realized by natural approach of the clamping block inclined planes in the stretching process, and in addition, as the clamping block inclined planes are symmetrically arranged, two sides of the clamping block are simultaneously tightened towards the center in the stretching process, so that the good centering property of the sample can be ensured.
Description
Technical Field
The invention relates to the technical field of mechanical property testing of metal plates, in particular to a clamp suitable for tensile DIC testing of the metal plates, and particularly relates to a Gleeble platform-based high-temperature high-speed tensile DIC testing clamp for the metal plates.
Background
The thermal simulation test technology is a very important and effective means in the current material research neighborhood, can simulate the behavior of a metal material in the thermal processing process, simply and conveniently reappear the thermal processing phenomenon of the metal material, is commonly used in the metal thermal forming technology research neighborhood at present, and is particularly important for accurately measuring the mechanical properties of the material (such as boron steel and the like) which simultaneously undergoes phase change in the thermal forming process by using the thermal simulation test technology. However, when the thermal simulation test technology is used for measuring the strain, more or contact-type measuring devices are used at present, such as L-strain, C-Gauge and the like which are commonly used on a Gleeble thermal simulation testing machine, the contact-type measuring method can only measure the strain between two points, and meanwhile, the accuracy of the measurement result is difficult to ensure due to the temperature gradient on the sample.
Digital Image Correlation (DIC) technology is a non-contact optical measurement experimental technology, which can obtain the full-field strain in the material deformation process, and is currently widely applied to many aspects of material research, especially the aspect of mechanical property characterization. However, the use of the current DIC technology is mainly focused on normal temperature deformation, and the DIC testing technology at extreme temperatures is not mature.
The combination of a thermal simulation test technology and a DIC test technology can accurately represent the deformation behavior of the metal plate under the high-temperature and high-speed stretching condition, and few reports are reported in public data, and the method relates to a series of problems such as design of a high-temperature stretching clamp, preparation of high-temperature speckles and the like. When a Gleeble-carried plate high-temperature stretching clamp is used, only the side face of a plate sample can be observed, and the deformation of the sample in the plate surface direction cannot be observed; the self-made clamp reported by published materials also has the problems of complex structure, inconvenient operation, poor centering performance and the like.
In order to conveniently and quickly perform the high-temperature and high-speed DIC test on the sheet material on the Gleeble platform, a clamp which is based on the Gleeble platform and suitable for the high-temperature and high-speed deformation DIC test of the sheet material is needed.
The patent application with application number 201120315679.5 discloses a tensile anchor clamps of sheet metal high temperature, is especially used for the tensile anchor clamps of sheet metal high temperature below 2mm of thickness, including anchor clamps main part, pin, the pin is the step pin, and the sample is tightly supported by the broad face step of step pin on pinhole department one side, and the opposite side is tightly supported through fastening screw by the sleeve pipe of dress outside the pin narrow face step. The clamp body is provided with a centering scribed line. The end face of the pin sleeve can be in a circular ring shape or a square ring shape with the thickness of 5mm, and can also be in a circular ring shape or a square ring shape with the thickness of 5 mm. Therefore, the sample is firmly attached to the pin hole by the front pin wide-surface step, the rear pin wide-surface step and the pin sleeve end surface through the fastening screw, the sample pin hole is prevented from deforming due to force concentration, and no space is provided for pin hole deformation. The problem of sheet metal high temperature tensile test because of sample pinhole deformation failure is solved. The scheme cannot observe the deformation of the sample in the plate surface direction, has single function, and is not suitable for representing the deformation behavior of the metal plate under the high-temperature and high-speed stretching condition.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a clamp suitable for metal plate tensile DIC testing.
The clamp suitable for the metal plate tensile DIC test comprises an inner clamp and an outer clamp, wherein the outer clamp comprises an outer clamping block, the inner clamp comprises an inner clamping block, the inner clamping block is matched with the inner clamping block to clamp a sample, the outer clamping block is matched with the inner clamping block to clamp the inner clamping block, and the outer clamp and the inner clamp are matched with the inner side surface of the outer clamping block through the opposite surface of the clamping surface of the inner clamping block to clamp the sample.
Preferably, the inner side inclined plane of the outer clamping block and the inclined plane opposite to the clamping surface of the inner clamping block are matched with each other to clamp the sample.
Preferably, the outer clamp includes two outer clamping blocks, the two outer clamping blocks cooperate with each other to clamp the inner clamping block, the outer clamping block is C-shaped, and any one or more of the following positions on the outer clamping block is/are inclined planes inclined to one side of the C-shaped end face: the inner side of the upper end of the opening of the C-shaped outer clamping block, the inner side of the lower end of the opening of the C-shaped outer clamping block and the inner side of the vertical wall of the opening of the C-shaped outer clamping block.
Preferably, the outer clamping block is of a C shape, the inner side of the upper end of the opening of the outer clamping block of the C shape and the inner side of the lower end of the opening of the outer clamping block of the C shape are inclined planes inclined to one side of the C-shaped end face, and the two outer clamping blocks of the C shape are symmetrically arranged and then matched to clamp the inner clamping block.
Preferably, the outer clamping block is of a C shape, the inner side of the vertical wall of the opening of the outer clamping block of the C shape is an inclined plane inclined to one side of the C-shaped end face, and the two outer clamping blocks of the C shape are symmetrically arranged and then matched with each other to clamp the inner clamping block.
Preferably, interior anchor clamps include two interior clamp blocks, and the cooperation carries out the centre gripping to the sample behind the clamp block symmetrical arrangement in two, the opposite face of interior clamp block clamping face is the inclined plane, has the contained angle between the opposite face of interior clamp block clamping face and the clamping face promptly, be provided with one or more recess on the interior clamp block clamping face.
Preferably, the test fixture further comprises a positioning pin, wherein the inner clamping block and the test sample are provided with positioning pin holes, and the positioning pin penetrates through the positioning pin holes in the inner clamping block and the positioning holes in the test sample to position the test sample.
Preferably, the clamping device further comprises a filling layer, and the filling layer is arranged on the clamping surface of the inner clamping block.
Preferably, the number of the inner clamping blocks and the shape of the clamping surface are determined according to the shape of the test sample.
Preferably, the surface of the outer clamping block, which is contacted with the clamping table, is an inclined surface.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, through the arrangement of the inner clamping block and the outer clamping block, the change of the sample placing direction is realized, the sample plane is perpendicular to the observation direction (the sample plane of the traditional clamp is parallel to the observation direction), and the DIC camera is convenient to observe the deformation condition in the recording plate surface during testing.
2. The clamping device realizes clamping through natural approach of the inclined plane of the clamping block in the stretching process, does not need fastening devices such as bolts and the like, has simple and reliable structure, is convenient to process, simultaneously enables the operation to be more convenient and faster, and is convenient for quickly replacing a sample; in addition, because the inclined planes of the clamping blocks are symmetrically arranged, the two sides of the clamping blocks are simultaneously tightened towards the center during stretching, and the good centering performance of the sample can be ensured.
3. The positioning pin is arranged in the inner clamping block, so that the accurate positioning of the sample in the clamping and testing processes can be realized, and the fixing reliability of the sample when the tensile force is large is ensured.
4. When the size of the sample is in a certain range, the test can be realized by only one set of clamp; when the size of the sample exceeds the range, the test requirement can be met by only replacing the inner clamping blocks in different styles without replacing the outer clamping blocks, and the cost is saved.
5. The inner clamping block is provided with the groove, so that the contact conduction and heat transfer characteristics of the clamping block and a sample can be changed by arranging different groove positions and sizes, different test requirements are met, the outer clamping block does not need to be replaced, and the cost is saved.
6. The filling layer is arranged at the contact part of the inner clamping block and the sample, so that the electric conduction and heat transfer characteristics of the contact interface can be changed by changing the material of the filling layer, and the test requirements of different materials and the control of the length of the uniform temperature zone of the sample are met.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic perspective view of a first embodiment of the present invention.
Fig. 2 is a schematic plan half-section view of a first embodiment of the present invention.
Fig. 3 is a schematic perspective view of a second embodiment of the present invention.
Fig. 4 is a schematic plan half-section view of a second embodiment of the present invention.
Fig. 5 is a schematic perspective view of a third embodiment of the present invention.
Fig. 6 is a schematic plan half-section view of a third embodiment of the present invention.
Fig. 7 is a schematic perspective view of a fourth embodiment of the present invention.
Fig. 8 is a schematic plan half-section view of a fourth embodiment of the present invention.
Fig. 9 is a schematic perspective view of the Gleeble clamping table of the present invention.
The figures show that:
in the figure, alpha is an included angle between the same-phase adjacent surfaces of the outer clamping blocks, which are contacted with the clamping table, beta is an included angle between the same-phase adjacent surfaces of the clamping surfaces of the inner clamping blocks, which are opposite to the inclined surfaces, and t represents a distance between the surface, which is perpendicular to the clamping surfaces, of the inner clamping blocks and the surface, which is perpendicular to the clamping surfaces, of the outer clamping blocks.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The clamp suitable for the metal plate tensile DIC test comprises an inner clamp and an outer clamp, wherein the outer clamp comprises an outer clamping block 1, the inner clamp comprises an inner clamping block 2, the inner clamping blocks 2 are matched with each other to clamp a sample, the outer clamping blocks 1 are matched with each other to clamp the inner clamping block 2, the outer clamp and the inner clamp are matched with the inner side face of the outer clamping block 1 through the opposite face of the clamping face of the inner clamping block 2 to clamp the sample.
The inclined plane of the inner side of the outer clamping block 1 is matched with the inclined plane opposite to the clamping surface of the inner clamping block 2 to clamp the sample.
The outer anchor clamps include two outer clamp splice 1, two outer clamp splice 1 cooperate each other and carry out the centre gripping to interior clamp splice 2, outer clamp splice 1 is the C type, any department or arbitrary many departments of following position are the inclined plane to C type terminal surface one side slope on the outer clamp splice 1: the inner side of the upper end of the opening of the C-shaped outer clamping block 1, the inner side of the lower end of the opening of the C-shaped outer clamping block 1 and the inner side of the vertical wall of the opening of the C-shaped outer clamping block 1.
The outer clamping block 1 is of a C shape, the inner side of the upper end of an opening of the outer clamping block 1 of the C shape and the inner side of the lower end of the opening of the outer clamping block 1 of the C shape are inclined planes inclined to one side of a C-shaped end face, and the two outer clamping blocks 1 of the C shape are symmetrically arranged and then matched with each other to clamp the inner clamping block 2.
The outer clamping block 1 is C-shaped, the inner side of the vertical wall of the opening of the C-shaped outer clamping block 1 is an inclined plane inclined towards one side of the C-shaped end face, and the two C-shaped outer clamping blocks 1 are symmetrically arranged and then are matched with each other to clamp the inner clamping block 2.
Interior anchor clamps include two interior clamp splices 2, and the cooperation carries out the centre gripping to the sample behind the 2 symmetrical arrangements of two interior clamp splices, the opposite face of 2 clamping surfaces of interior clamp splices is the inclined plane, has the contained angle between the opposite face of 2 clamping surfaces of interior clamp splices promptly and the clamping surface, be provided with one or more recess on the 2 clamping surfaces of interior clamp splices.
Still include locating pin 4, be provided with the locating pin hole on interior clamp splice 2 and the sample, locating pin 4 is fixed a position the sample after running through the locating pin hole on interior clamp splice 2 and the locating hole on the sample. The clamping device further comprises a filling layer 5, and the filling layer 5 is arranged on the clamping surface of the inner clamping block 2. The number of the inner clamping blocks 2 and the shape of the clamping surface are determined according to the shape of the sample. The surface of the outer clamping block 1, which is contacted with the clamping table, is an inclined surface, so that the clamping table can conveniently clamp the outer clamping block 1.
The number of the inner clamping blocks 2 and the shape of the clamping surface are determined according to the shape of a sample, for example, when the sample is a plate, the number of the inner clamping blocks 2 is two, the clamping surface is a plane, and the two inner clamping blocks 2 are symmetrically distributed on two plate surfaces of the plate to clamp the plate; when the sample is a triangular prism, the number of the inner clamping blocks 2 is preferably three, the clamping surfaces are planes, and the three inner clamping blocks 2 respectively clamp the three surfaces of the triangular prism; when the sample is a cylinder, the number of the inner clamping blocks 2 is preferably two, the clamping surfaces are curved surfaces, and the two inner clamping blocks 2 are symmetrically distributed on two sides of the cylinder to clamp the cylinder. The outer clamping block 1 is matched with the inner clamping block 2 to clamp the sample.
As shown in fig. 1-9, a clamp suitable for a tensile DIC test of a metal plate, in particular to a high-temperature high-speed tensile DIC test of a metal plate based on a Gleeble platform, wherein during the tensile test, two pairs of outer clamps and two pairs of inner clamps are required, each outer clamp comprises two outer clamping blocks 1, each inner clamp comprises two inner clamping blocks 2, each outer clamping block 1 is C-shaped, the inner side of the upper end of an opening of each C-shaped outer clamping block 1 and the inner side of the lower end of the opening of each C-shaped outer clamping block 1 are inclined planes inclined to one side of a C-shaped end surface, and the two C-shaped outer clamping blocks 1 are symmetrically arranged and then cooperate to clamp the inner clamping blocks 2; the opposite surface of the clamping surface of the inner clamping block 2 is an inclined surface, namely an included angle is formed between the opposite surface of the clamping surface of the inner clamping block 2 and the clamping surface, one or more grooves are arranged on the clamping surface of the inner clamping block 2, and the grooves are used for reducing heat transfer between the sample and the clamp; the inner clamping block 2 is provided with a positioning pin hole, the positioning pin 4 penetrates through the positioning pin hole in the inner clamping block 2 and the positioning hole in the plate tensile sample 3 to position and fix the position of the plate tensile sample 3, the filling layer 5 is arranged or not arranged on the clamping surface of the inner clamping block 2 according to the test requirement, and the material of the filling layer 5 is flexibly adjusted according to the actual test requirement.
Firstly, one end of a plate tensile sample 3 is placed between clamping surfaces of two inner clamping blocks 2, and the plate tensile sample 3 is fixed in position through a positioning pin 4 penetrating through positioning pin holes in the two inner clamping blocks 2 and positioning holes in the plate tensile sample 3; secondly, placing the two inner clamping blocks 2 provided with the plate tensile sample 3 between the clamping surfaces of the two outer clamping blocks 1 in a manner that the clamping direction of the inner clamping blocks 2 is vertical to that of the outer clamping blocks 1, namely, the opposite inclined surfaces of the clamping surfaces of the two inner clamping blocks 2 are in matched connection with the upper inner inclined surfaces and the lower inner inclined surfaces of the C-shaped openings of the two outer clamping blocks 1, as shown in fig. 1-8; finally, clamping the two outer clamping blocks 1 provided with the plate tensile sample 3 with a Gleeble testing machine clamping table, wherein the opposite surfaces of the clamping surfaces of the outer clamping blocks 1 are arranged to be inclined surfaces matched with the clamping table for facilitating the clamping of the Gleeble testing machine clamping table; the other end of the sheet material tensile specimen 3 was fixed in the same manner. When a plate tensile sample 3 is stretched, as shown in fig. 1-9, an inner clamping block 2 is matched with an outer clamping block 1 through an inclined plane, the inclined plane inclines towards one side opposite to the stretching direction, the inclined plane at the inner side of the outer clamping block 1 is naturally close to the inclined plane opposite to the clamping surface of the inner clamping block 2 in the stretching process, so that the plate tensile sample 3 is clamped, and in addition, because the inclined planes of the inner clamping block and the outer clamping block are symmetrically arranged, two sides of the inner clamping block and the outer clamping block are simultaneously tightened towards the center in the stretching process, so that the good centering performance of the sample can be ensured; in order to prevent the positioning pin 4 from being bent under stress during the stretching process, the positioning pin hole on the inner clamping block 2 is tangent to the vertical surface of the groove on the inner clamping block. In addition, when the inner side surface of the C-shaped opening vertical arm of the outer clamping block 1 is an inclined surface matched with the opposite inclined surface of the clamping surface of the inner clamping block 2, the clamping direction of the inner clamp can be parallel to the clamping direction of the outer clamp.
Example 1:
as shown in fig. 1 and fig. 2, the clamp suitable for the tensile DIC test of the metal plate of the present embodiment includes an outer clamping block 1, an inner clamping block 2, a positioning pin 4 and a filling layer 5; the number of the outer clamping blocks 1 is 4, inner and outer inclined planes are processed on the outer clamping blocks 1, and the outer inclined planes of the outer clamping blocks 1 are in contact with a clamping table of a Gleeble testing machine to realize clamping; the number of the inner clamping blocks 2 is 4, the inner clamping blocks 2 are provided with inclined planes, grooves and positioning pin holes, the number of the grooves is 3, the inclined planes of the inner clamping blocks 2 are matched with the inner inclined planes of the outer clamping blocks 1 to realize clamping, and the grooves are used for reducing heat transfer between a sample and a clamp; the number of the positioning pins 4 is 2, and the positioning pins penetrate through positioning pin holes in the inner clamping block 2 and positioning holes in the plate tensile sample 3; the material of the filling layer 5 is arranged on the clamping surface of the inner clamping block 2; after the plate tensile sample 3 is clamped, the surface of the inner clamping block 2 perpendicular to the clamping surface of the inner clamping block is not flush with the surface of the outer clamping block 1 perpendicular to the clamping surface of the outer clamping block, the surface of the inner clamping block 2 perpendicular to the clamping surface of the inner clamping block protrudes out of the surface of the outer clamping block 1 perpendicular to the clamping surface of the outer clamping block, the distance between the surface of the inner clamping block 2 perpendicular to the clamping surface of the inner clamping block and the surface of the outer clamping block 1 perpendicular to the clamping surface of the outer clamping block is t, preferably, t is 3-5 mm, and therefore the clamp and the Gleeble clamping table can be conveniently fixed. An included angle between the same-phase adjacent surfaces of the outer clamping blocks, which are in contact with the clamping table, is alpha, and the value of the alpha is determined according to the size of the Gleeble clamping table; the included angle between the opposite inclined surfaces of the clamping surfaces of the inner clamping blocks and the same adjacent surfaces is beta, and preferably the beta is 100 degrees; in order to prevent the positioning pin 4 from being bent under stress, the positioning pin hole on the inner clamping block 2 is tangent to the vertical surface of the groove on the inner clamping block; in order to ensure good electric conduction between the plate tensile sample 3 and the inner clamping block 2, the material of the filling layer 5 is selected from graphite; in order to reduce the heat transfer between the sheet material tensile sample 3 and the inner clamping block 2 and thereby make the homogeneous temperature zone of the sample longer, the filling layer 5 is provided with different materials at different contact positions, for example, a heat insulating material may be arranged on the inner side (the side close to the sheet material tensile sample 3) of the inner clamping block 2, and a conductive material may be arranged on the outer side (the side far from the sheet material tensile sample 3) of the inner clamping block 2.
Example 2:
as shown in fig. 3 and 4, in this embodiment, the filling layer 5 is removed in addition to embodiment 1. So set up, the operation is got up convenient and fast more, is applicable to the test occasion that the electrically conductive and heat transfer characteristic between to tensile panel sample 3 and interior clamp splice 2 do not have high requirements.
Example 3:
as shown in fig. 5 and 6, in this embodiment, on the basis of embodiment 1, 1 groove is provided in the inner clamping block 2, and the positions of the positioning pin holes on the grooves are also adjusted accordingly. The device is suitable for the plate tensile sample 3 with smaller size.
Example 4:
as shown in fig. 7 and 8, in this embodiment, the filling layer 5 is removed in addition to embodiment 3. So set up, the operation is got up convenient and fast more, is applicable to the less panel tensile sample 3 of size and to the electrically conductive and the not high test occasion of heat transfer characteristic requirement between tensile sample 3 and the interior clamp splice 2.
The working process of the tensile test carried out by the invention is as follows:
firstly, selecting an inner clamping block: selecting a proper pattern of the inner clamping block 2 according to the specific size of the plate tensile sample 3 to be tested;
secondly, selecting a filling layer: selecting (or not selecting) the filling layer 5 according to the requirements on the electric conduction and heat transfer characteristics between the tensile sample 3 and the inner clamping block 2;
thirdly, sample loading and clamp assembling: respectively penetrating a positioning hole of the tensile sample 3 and a pin hole of the inner clamping block 2 by using a positioning pin 4, and assembling the tensile sample 3 and the 4 inner clamping blocks 2; further, the inner inclined plane of the outer clamping block 1 and the inclined plane opposite to the clamping surface of the inner clamping block 2 are assembled in a matched mode, and therefore the assembly of the clamp is completed;
fourthly, clamping and centering: and (3) putting the assembled clamp on a clamping table of a Gleeble testing machine, adjusting the testing machine, and realizing clamping of the clamp and centering of a sample based on certain pretightening force of the clamp.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (6)
1. The clamp suitable for the tensile DIC test of the metal plate is characterized by comprising an inner clamp and an outer clamp, wherein the outer clamp comprises an outer clamping block (1), the inner clamp comprises an inner clamping block (2), the inner clamping blocks (2) are matched with each other to clamp a sample, the outer clamping blocks (1) are matched with each other to clamp the inner clamping blocks (2), and the outer clamp and the inner clamp are matched with each other through the opposite surface of the clamping surface of the inner clamping block (2) and the inner side surface of the outer clamping block (1) to clamp the sample;
the inner side inclined plane of the outer clamping block (1) is matched with the inclined plane opposite to the clamping surface of the inner clamping block (2) to clamp the sample;
outer anchor clamps include two outer clamp splice (1), two outer clamp splice (1) are mutually supported and are carried out the centre gripping to interior clamp splice (2), outer clamp splice (1) is the C type, any department or arbitrary many places in following position are the inclined plane to C type terminal surface one side slope on outer clamp splice (1): the inner side of the upper end of an opening of the C-shaped outer clamping block (1), the inner side of the lower end of the opening of the C-shaped outer clamping block (1) and the inner side of the vertical wall of the opening of the C-shaped outer clamping block (1);
the surface of the outer clamping block (1) contacting with the clamping table is an inclined surface;
the opposite surface of the clamping surface of the inner clamping block (2) is an inclined surface, namely an included angle is formed between the opposite surface of the clamping surface of the inner clamping block (2) and the clamping surface, and one or more grooves are formed in the clamping surface of the inner clamping block (2);
the number of the inner clamping blocks (2) and the shape of the clamping surface are determined according to the shape of the sample.
2. The clamp suitable for the tensile DIC test of the metal plates as claimed in claim 1, wherein the outer clamping blocks (1) are C-shaped, the inner sides of the upper ends of the openings of the C-shaped outer clamping blocks (1) and the lower ends of the openings of the C-shaped outer clamping blocks (1) are inclined planes inclined to one side of a C-shaped end face, and the two C-shaped outer clamping blocks (1) are symmetrically arranged and matched with the inner clamping blocks (2) to clamp.
3. The clamp suitable for the tensile DIC test of the metal plates as claimed in claim 1, wherein the outer clamping blocks (1) are C-shaped, the inner side of the vertical wall of the opening of the C-shaped outer clamping block (1) is an inclined surface inclined to one side of the C-shaped end surface, and the two C-shaped outer clamping blocks (1) are symmetrically arranged and then matched with the inner clamping block (2) to clamp.
4. The clamp suitable for the metal plate material tensile DIC test of claim 1, wherein the inner clamp comprises two inner clamping blocks (2), and the two inner clamping blocks (2) are symmetrically arranged and matched to clamp a sample.
5. The clamp suitable for the metal plate material tensile DIC test of claim 1, further comprising a positioning pin (4), wherein the inner clamping block (2) and the test sample are provided with positioning pin holes, and the positioning pin (4) penetrates through the positioning pin hole in the inner clamping block (2) and the positioning hole in the test sample to position the test sample.
6. The clamp suitable for the tensile DIC test of sheet metal according to claim 1, further comprising a filler layer (5), wherein the filler layer (5) is disposed on the clamping surface of the inner clamping block (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910142580.0A CN109883818B (en) | 2019-02-26 | 2019-02-26 | Clamp suitable for metal plate tensile DIC test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910142580.0A CN109883818B (en) | 2019-02-26 | 2019-02-26 | Clamp suitable for metal plate tensile DIC test |
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| CN109883818A CN109883818A (en) | 2019-06-14 |
| CN109883818B true CN109883818B (en) | 2021-03-09 |
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