Split clamp for reciprocating torsion of high strength metal specimens

Abstract

The utility model provides a kind of for high-strength metal sample reciprocating torsion split type clamp, including oppositely arranged first clamp and second clamp, first clamp has the first side surface towards second clamp, second clamp has the second side surface towards first clamp, first clamping plate is detachably assembled on first side surface, second clamping plate is detachably assembled on second side surface, the side of first clamping plate towards second clamping plate is first clamping surface, the side of second clamping plate towards first clamping plate is second clamping surface, first clamping surface and second clamping surface can form the clamping of high-strength metal sample, the vickers hardness of first clamping plate and second clamping plate is higher than the vickers hardness of first clamp and second clamp.The utility model can effectively improve the clamping stability of sample, avoid sample skidding phenomenon in reciprocating torsion process, and service life is longer, reduces test cost, maintenance, replacement is more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of metal specimen tensile and torsion fixture design technology, specifically relating to a split-type fixture for reciprocating torsion of high-strength metal specimens. Background Technology

[0002] Metallic materials, possessing comprehensive mechanical and physicochemical properties such as strength, plasticity, and toughness, are widely used in almost all industrial fields, including aerospace, petrochemicals, and transportation, making them an indispensable class of materials for human society. In recent years, gradient structure materials have been extensively studied due to their excellent strength-plasticity matching, overcoming the dilemma of strength-plasticity inversion. Cyclic Torsion Strengthening (CT) of metallic materials is a plastic processing technique that improves the mechanical properties of materials by applying cyclic torsional loads. It creates a gradient structure throughout the sample by generating a gradient distribution of shear plastic strain from the surface to the interior of the metallic material. Due to its high efficiency and economy, CT technology can be applied to the strengthening of various metallic materials and has extremely high research value.

[0003] High-strength wire (a type of high-strength metal specimen) typically possesses extremely high hardness, usually exceeding 600 HV. However, the flat clamps used in conventional torsion fatigue testing machines are made of Cr12MoV cold work die steel, with a hardness of 600 HV, lower than that of high-strength wire. Because high-strength wire often has a small diameter, the original flat clamps are typically used for holding it in reciprocating torsion tests. During reciprocating torsion, there is a significant relative movement tendency between the clamps and the high-strength wire, and the contact area is extremely small. This results in severe wear of the flat clamps during reciprocating torsion, making it impossible for subsequent clamps to hold the high-strength wire tightly. This hinders accurate control of the actual torsion angle during cyclic torsion, and the high cost of the clamps severely restricts the application of reciprocating torsion tests with high-strength wire. Utility Model Content

[0004] Therefore, this utility model provides a split-type clamp for reciprocating torsion of high-strength metal specimens, which can overcome the technical problem in the related technology that when using a flat plate clamp for tensile torsion testing, the contact area of ​​the high-strength metal specimen is small and there is a great tendency for relative motion, which leads to severe wear of the flat plate clamp and thus the inability to clamp the specimen.

[0005] To address the aforementioned problems, this utility model provides a split-type clamp for reciprocating torsion of high-strength metal specimens, comprising a first clamp and a second clamp arranged opposite to each other. The first clamp has a first side facing the second clamp, and the second clamp has a second side facing the first clamp. A first clamping plate is detachably assembled on the first side, and a second clamping plate is detachably assembled on the second side. The side of the first clamp facing the second clamping plate is a first clamping surface, and the side of the second clamp facing the first clamping plate is a second clamping surface. The first clamping surface and the second clamping surface can form a clamping mechanism for the high-strength metal specimen. The Vickers hardness of the first clamping plate and the second clamping plate is higher than that of the first clamp and the second clamp.

[0006] In some embodiments, the Vickers hardness of the first and second clamping plates is 100-250 HV higher than that of the high-strength metal sample.

[0007] In some embodiments, both the first clamping surface and the second clamping surface are provided with multiple limiting clamping grooves extending along the length direction of the high-strength metal sample and penetrating the opposite end faces of the first clamping plate or the second clamping plate. The limiting clamping grooves on the first clamping plate and the limiting clamping grooves on the second clamping plate are opposite to each other in the state where the first clamping plate and the second clamping plate clamp the high-strength metal sample to form a left-right symmetrical clamping of the high-strength metal sample.

[0008] In some embodiments, each of the limiting clamping grooves is evenly spaced along the width direction of the first clamping plate or the second clamping plate.

[0009] In some embodiments, the limiting clamping groove is formed by two adjacent protruding ridges formed on the first clamping surface or the second clamping surface, the cross-section of each protruding ridge is an isosceles triangle, and the base angle of the isosceles triangle is 30° to 60°, and / or the height of the isosceles triangle is 0.3mm to 0.7mm.

[0010] In some embodiments, the first clamping plate and the first fixture have multiple concave-convex mating positioning structures. The concave-convex mating positioning structures include positioning protrusions and positioning grooves that are matched and fitted together. The positioning protrusions and positioning grooves extend along the length direction of the high-strength metal sample, and each of the positioning protrusions or positioning grooves is evenly spaced in the width direction of the first fixture or the second fixture.

[0011] In some embodiments, the limiting clamping groove and the positioning groove are formed by wire electrical discharge machining.

[0012] In some embodiments, the thickness of the first clamping plate and the second clamping plate is 1.5 mm to 3 mm.

[0013] In some embodiments, the first clamping plate and the first clamp are detachably connected by a magnetic attraction element, and / or the second clamping plate and the second clamp are detachably connected by a magnetic attraction element.

[0014] In some embodiments, the first clamping plate has a first protrusion above the top side end face of the first clamp, the magnetic attractor being attracted to the side of the first protrusion facing the first side and to the top side end face of the first clamp; and / or, the second clamping plate has a second protrusion above the top side end face of the second clamp, the magnetic attractor being attracted to the side of the second protrusion facing the second side and to the top side end face of the second clamp.

[0015] The split-type clamp for reciprocating torsion of high-strength metal specimens provided by this utility model has the following beneficial effects:

[0016] By detachably assembling a first clamping plate and a second clamping plate with higher hardness on opposite sides of the first and second clamps, when clamping high-strength metal samples, the clamping plate with higher hardness, as the part in direct contact with the high-strength metal sample, can effectively prevent wear caused by direct contact between the first and second clamps and the high-strength metal sample, thus protecting the main body of the clamp. Due to the higher hardness of the first and second clamping plates, their wear resistance with the high-strength metal sample is stronger during the test, which can effectively improve the clamping stability of the sample, avoid the slippage of the sample during reciprocating torsion, and extend the service life, thus reducing the test cost. The first and second clamping plates are detachably assembled, so they can be replaced or repaired after wear, without having to replace the larger and more expensive main body of the clamp (which is part of the tensile-torsion fatigue testing machine and has a high purchase cost), making maintenance and replacement more convenient. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a split-type clamp for reciprocating torsion of a high-strength metal sample in one embodiment of the present invention.

[0019] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0020] Figure 3 The results show the response curves of high-strength wire reciprocating torsion cycles using the original fixture before improvement, the original fixture after multiple wears and uses, and the split fixture in this utility model.

[0021] Figure 4 This is the clamping morphology of the clamping end of the high-strength wire after a reciprocating torsion cycle test using the split-type clamp of this utility model.

[0022] The attached figures are labeled as follows:

[0023] 11. First clamp; 12. Second clamp; 21. First clamping plate; 22. Second clamping plate; 201. Limiting clamping groove; 202. Protruding ridge; 3. Magnetic suction component; 100. High-strength metal sample. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0026] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0027] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0028] See Figure 1 and Figure 4 As shown, according to an embodiment of the present invention, a split-type clamp for reciprocating torsion of a high-strength metal sample is provided, including a first clamp 11 and a second clamp 12 disposed opposite to each other. The first clamp 11 has a first side facing the second clamp 12 (not labeled in the figure), and the second clamp 12 has a second side facing the first clamp 11 (not labeled in the figure). The first clamp 11 and the second clamp 12 can be driven to approach each other to form a clamping grip on an object (such as the aforementioned high-strength metal sample) located between the first side and the second side. A first clamping plate 21 is detachably assembled on the first side, and a second clamping plate 22 is detachably assembled on the second side. The side of the first clamping plate 21 facing the second clamping plate 22 is a first clamping surface (not labeled in the figure), and the side of the second clamping plate 22 facing the first clamping plate 21 is a second clamping surface (not labeled in the figure). The first clamping surface and the second clamping surface can form a clamping effect on the high-strength metal sample 100. The Vickers hardness of the first clamping plate 21 and the second clamping plate 22 is higher than that of the first clamp 11 and the second clamp 12. It should be noted that the aforementioned high-strength metal sample is specifically, for example, the high-strength wire shown in the figure, which is a filamentous material with a diameter of less than 3 mm and a Vickers hardness higher than 600 HV.

[0029] In this technical solution, a first clamping plate 21 and a second clamping plate 22 with higher hardness are detachably assembled on the opposite sides of the first clamp 11 and the second clamp 12, respectively. When clamping high-strength metal samples, the clamping plate with higher hardness, as the part in direct contact with the high-strength metal sample, can effectively prevent wear caused by direct contact between the first clamp 11 and the second clamp 12 and the high-strength metal sample, thus protecting the main body of the clamp. Because the first clamping plate 21 and the second clamping plate 22 have higher hardness, their wear resistance with the high-strength metal sample is stronger during the test, which can effectively improve the clamping stability of the sample, avoid the slippage of the sample during the reciprocating torsion process, and have a longer service life, thus reducing the test cost. The first clamping plate 21 and the second clamping plate 22 are detachably assembled, which can be replaced or repaired after wear, without replacing the larger and more expensive main body of the clamp (which is part of the tensile-torsion composite fatigue testing machine and has a high purchase cost), making maintenance and replacement more convenient.

[0030] In order to further improve the service life of the first clamping plate 21 and the second clamping plate 22 and reduce maintenance costs, in some embodiments, the Vickers hardness of the first clamping plate 21 and the second clamping plate 22 is 100-250 HV higher than that of the high-strength metal sample 100.

[0031] In some embodiments, both the first and second clamping surfaces are provided with multiple grooves along the length of the high-strength metal sample 100 (within a certain range). Figure 1 The indicated orientation (i.e., the height direction, i.e., the tensile direction of the specimen) extends through the limiting clamping grooves 201 on the opposite end faces of the first clamping plate 21 or the second clamping plate 22. The limiting clamping grooves 201 on the first clamping plate 21 and the limiting clamping grooves 201 on the second clamping plate 22 are opposite to each other in the state where the first clamping plate 21 and the second clamping plate 22 clamp the high-strength metal specimen 100 to form a left-right symmetrical clamping of the high-strength metal specimen 100.

[0032] In this technical solution, by setting limiting clamping grooves 201 on the first clamping surface and the second clamping surface respectively, the high-strength metal sample 100 between the two sides can be symmetrically clamped by the limiting clamping grooves 201 on both sides. This can increase the contact area between the first clamping plate 21 and the second clamping plate 22 and the high-strength metal sample 100, thereby further improving the clamping reliability of the fixture on the sample and reducing the probability of slippage during the torsion process.

[0033] In a preferred embodiment, each of the limiting clamping grooves 201 is evenly spaced along the width direction of the first clamping plate 21 or the second clamping plate 22. By having multiple limiting clamping grooves 201 evenly spaced, when a certain limiting clamping groove 201 wears out after multiple uses, the relative position of the first clamping plate 21 and the second clamping plate 22 can be adjusted laterally, thereby achieving reliable clamping of the sample by the two brand-new and undamaged limiting clamping grooves 201, and further improving the service life of the clamping plates.

[0034] In some embodiments, the limiting clamping groove 201 is formed by two adjacent protruding ridges 202 formed on the first clamping surface or the second clamping surface. The cross-section of each protruding ridge 202 is an isosceles triangle, and the base angle of the isosceles triangle is 30° to 60°, and / or the height of the isosceles triangle is 0.3mm to 0.7mm. It is understood that the cross-section of each of the corresponding limiting clamping grooves 201 is V-shaped. In this technical solution, the height of the isosceles triangle is 0.3mm to 0.7mm, that is, the V-shaped groove depth of the formed limiting clamping groove 201 is 0.3mm to 0.7mm. This is suitable for reliable clamping of φ1-3mm high-strength wires during cyclic torsion. It is understood that in specific use, the diameter of the sample should be greater than the sum of the groove depths of the two limiting clamping grooves 201 on both sides.

[0035] In some embodiments, the first clamping plate 21 and the first clamp 11 have multiple convex-concave mating positioning structures (not shown in the figures, not indexed). These convex-concave mating positioning structures include mutually matching positioning protrusions (not shown in the figures, not indexed) and positioning grooves (not shown in the figures, not indexed). Both the positioning protrusions and positioning grooves extend along the length direction of the high-strength metal sample 100, and each positioning protrusion or positioning groove is evenly spaced along the width direction of the first clamp 11 or the second clamp 12. Specifically, for example, multiple positioning grooves are formed on the side of the clamping plate facing the clamp, while multiple positioning protrusions are formed on the side of the clamp facing the clamping plate; alternatively, they can be arranged in reverse.

[0036] In this technical solution, on the one hand, the connection and positioning of the two are achieved by the convex and concave positioning structure between the clamping plate and the fixture. On the other hand, the positioning protrusions and positioning grooves are set at equal intervals to achieve precise alignment of the limiting clamping grooves 201 on both sides of the clamping plate, ensuring selective pairing and use of each limiting clamping groove 201, and improving the service life of the first clamping plate 21 and the second clamping plate 22.

[0037] In one specific embodiment, the aforementioned limiting clamping groove 201 and positioning groove are formed by wire electrical discharge machining, which can simplify the machining process of each groove and improve the machining accuracy of the groove.

[0038] In some embodiments, the thickness of the first clamping plate 21 and the second clamping plate 22 is 1.5mm to 3mm. This prevents the clamping plates from being damaged due to insufficient strength during clamping if the thickness is too small, while the overall weight of the clamping plates is too large if the thickness is too large, making it more difficult to assemble with the corresponding first clamping fixture 11 or second clamping fixture 12.

[0039] In some embodiments, the first clamping plate 21 and the first clamp 11 are detachably connected by a magnetic attractor 3, and / or the second clamping plate 22 and the second clamp 12 are detachably connected by a magnetic attractor 3. The magnetic attractor 3 can be a permanent magnet. In this case, the first clamping plate 21, the second clamping plate 22, the first clamp 11 and the second clamp 12 need to be made of a magnetically attractable material, such as iron. Of course, in some cases, the corresponding magnetically attractable material can be set in the areas of the first clamping plate 21, the second clamping plate 22, the first clamp 11 and the second clamp 12 corresponding to the position of the magnetic attractor 3. Other parts can be made of appropriate materials according to actual needs.

[0040] In this technical solution, the magnetic suction component 3 enables the detachable assembly and connection of the clamping plates and the fixtures, making it very convenient to adjust the relative positions of the first clamping plate 21 and the second clamping plate 22, as well as to replace and maintain them. It is understood that the adsorption capacity of the aforementioned magnetic suction component 3 should be matched with the weight of the first clamping plate 21 and the second clamping plate 22 to ensure a reliable assembly and connection between the first clamping plate 21 and the second clamping plate 22 and the first fixture 11 and the second fixture 12.

[0041] See details Figure 1 As shown, in some embodiments, the first clamping plate 21 has a first protrusion (not shown) that is higher than the top side end face of the first clamp 11, and the magnetic attractor 3 is attracted to the side of the first protrusion facing the first side and is attracted to the top side end face of the first clamp 11; and / or, the second clamping plate 22 has a second protrusion (not shown) that is higher than the top side end face of the second clamp 12, and the magnetic attractor 3 is attracted to the side of the second protrusion facing the second side and is attracted to the top side end face of the second clamp 12. In a specific embodiment, the height of the aforementioned first and second protrusions is 3-6 mm, that is, in general, the height of the first clamping plate 21 and the second clamping plate 22 is 3-6 mm higher than the height of the first clamp 11 and the second clamp 12.

[0042] In this technical solution, by magnetically attaching the magnetic 3 to the top side end face of the clamp and the part of the clamp plate protruding from the top side end face of the corresponding clamp, the upper and lower positions of the clamp plate can be positioned by utilizing the bearing capacity of the top side end face.

[0043] In this utility model, in specific use, the aforementioned first clamp 11 and second clamp 12 can be the original (i.e., existing) clamps on the tensile-torsion composite fatigue testing machine. The first clamping plate 21 and the second clamping plate 22 are manufactured separately and assembled on the aforementioned original clamps, thereby achieving reliable protection of the original clamps while greatly reducing the cost of use and maintenance.

[0044] In one specific embodiment, the main materials of the first clamping plate 21 and the second clamping plate 22 are M50 bearing steel and commercial M35 high-speed steel, with a hardness of up to 850HV, ensuring that clamping marks are left on the surface of the high-strength wire during clamping, preventing slippage during torsion. The first clamping plate 21 and the second clamping plate 22 are thin flat clamping plates, with a thickness of 1.5-3mm, a width of 40-80mm, and a height of 30-50mm, reducing the overall weight while ensuring structural strength.

[0045] It is understandable that, in practical use, it is necessary to reliably clamp both ends of the high-strength wire. Therefore, for the same high-strength wire, the fatigue testing machine needs to be equipped with the aforementioned two sets of split clamps. That is, objectively, for the same high-strength wire, the number of the first clamp 11, the second clamp 12, the first clamping plate 21, and the second clamping plate 22 are all two.

[0046] The technical solution of this utility model will be further described below with reference to the accompanying drawings.

[0047] Four toothed (i.e., the aforementioned protruding ridges 202) split-type clamps (i.e., two of the aforementioned first clamping plates 21 and two of the aforementioned second clamping plates 22) are processed using wire cutting (laser) to replace the four clamping blocks (i.e., two of the aforementioned first clamping plates 11 and two of the aforementioned second clamping plates 12) in direct contact with the high-strength wire during the reciprocating twisting process. The split-type clamps are 2mm thick, 24mm wide, and 40mm high.

[0048] Install and fix the original clamping block on the Instron E3000 tensile-torsion composite fatigue testing machine. Attach four square strong magnets (i.e., the aforementioned magnetic 3) to the top of the clamping block and attach the four separate clamps to the inside of the original clamping block to complete the installation of the separate clamps.

[0049] Place the φ2.6mm high-strength wire at the center of the E3000 lower chuck (i.e., the aforementioned split-type fixture at the bottom of the high-strength wire), align the gauge point at the bottom of the high-strength wire with the split-type fixture, ensuring good axial alignment, and close the lower chuck. This completes the sample loading process at the bottom of the split-type fixture. At this point, the high-strength wire is in close contact with the split-type fixture, and the split-type fixture is in close contact with the original fixture.

[0050] Move the upper chuck of the E3000 (that is, the aforementioned split clamp at the top of the high-strength wire) to align the upper gauge point of the high-strength wire with the split clamp and close the upper chuck to complete the clamping of the high-strength wire. At this time, the high-strength wire is located in the center of the clamp and coincides with the central axis of the equipment, with good centering.

[0051] The E3000 was started to reciprocate in a torsion pattern. During the torsion process, there was no slippage between the high-strength wire and the separate clamp, or between the separate clamp and the original clamp. The cyclic response curves during the reciprocating torsion process using the separate clamp, using the intact original clamp, and using the worn original clamp are shown below. Figure 3 As shown, the torque of the split fixture is comparable to that of the intact original fixture, and is significantly higher than that of the original fixture after wear, indicating that the split fixture has a similar clamping effect to the original fixture.

[0052] After the reciprocating twisting process, the high-strength wire was removed, and the morphology of the clamping end was observed; the clamping marks were clearly visible. The results of laser confocal microscopy observation are as follows: Figure 4 As shown, the clamping marks are evenly distributed at the contact points between the split clamp and the high-strength wire, with a width of 200 μm and a depth of 60 μm, indicating that the split clamp has good clamping performance.

[0053] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0054] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A split-type clamp for reciprocating torsion of high-strength metal specimens, characterized in that, The device includes a first clamp (11) and a second clamp (12) arranged opposite to each other. The first clamp (11) has a first side facing the second clamp (12), and the second clamp (12) has a second side facing the first clamp (11). A first clamping plate (21) is detachably assembled on the first side, and a second clamping plate (22) is detachably assembled on the second side. The side of the first clamping plate (21) facing the second clamping plate (22) is a first clamping surface, and the side of the second clamping plate (22) facing the first clamping plate (21) is a second clamping surface. The first clamping surface and the second clamping surface can form a clamping of a high-strength metal sample (100). The Vickers hardness of the first clamping plate (21) and the second clamping plate (22) is higher than that of the first clamp (11) and the second clamp (12).

2. The split-type clamp according to claim 1, characterized in that, The Vickers hardness of the first clamping plate (21) and the second clamping plate (22) is 100-250 HV higher than that of the high-strength metal sample (100).

3. The split-type clamp according to claim 1, characterized in that, Both the first clamping surface and the second clamping surface are provided with multiple limiting clamping grooves (201) that extend along the length direction of the high-strength metal sample (100) and penetrate the opposite end faces of the first clamping plate (21) or the second clamping plate (22). The limiting clamping grooves (201) on the first clamping plate (21) and the limiting clamping grooves (201) on the second clamping plate (22) are opposite to each other in the state where the first clamping plate (21) and the second clamping plate (22) clamp the high-strength metal sample (100) to form a left-right symmetrical clamping of the high-strength metal sample (100).

4. The split-type clamp according to claim 3, characterized in that, Each of the limiting clamping grooves (201) is evenly spaced along the width direction of the first clamping plate (21) or the second clamping plate (22).

5. The split-type clamp according to claim 3, characterized in that, The limiting clamping groove (201) is formed by two adjacent protrusions (202) formed on the first clamping surface or the second clamping surface. The cross-section of each protrusion (202) is an isosceles triangle, and the base angle of the isosceles triangle is 30° to 60°, and / or the height of the isosceles triangle is 0.3mm to 0.7mm.

6. The split-type clamp according to claim 3, characterized in that, The first clamping plate (21) and the first clamp (11) have multiple concave-convex mating positioning structures. The concave-convex mating positioning structures include positioning protrusions and positioning grooves that are matched and embedded with each other. The positioning protrusions and positioning grooves extend along the length direction of the high-strength metal sample (100), and each positioning protrusion or positioning groove is evenly spaced in the width direction of the first clamp (11) or the second clamp (12).

7. The split-type clamp according to claim 6, characterized in that, The limiting clamping groove (201) and the positioning groove are formed by wire electrical discharge machining.

8. The split-type clamp according to claim 1, characterized in that, The thickness of the first clamping plate (21) and the second clamping plate (22) is 1.5mm to 3mm.

9. The split-type clamp according to claim 1, characterized in that, The first clamp (21) is detachably connected to the first clamp (11) by a magnetic attraction (3), and / or the second clamp (22) is detachably connected to the second clamp (12) by a magnetic attraction (3).

10. The split-type clamp according to claim 9, characterized in that, The first clamp (21) has a first protrusion that is higher than the top side end face of the first clamp (11), and the magnetic attractor (3) is attracted to the side of the first protrusion facing the first side and is attracted to the top side end face of the first clamp (11); and / or, the second clamp (22) has a second protrusion that is higher than the top side end face of the second clamp (12), and the magnetic attractor (3) is attracted to the side of the second protrusion facing the second side and is attracted to the top side end face of the second clamp (12).

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