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Limit test fixture and method for fracture of high-strength steel plate in complex tension and compression path

A high-strength steel plate, limit testing technology, applied in the direction of testing material strength, measuring device, strength characteristics, etc. using stable tension/compression

Active Publication Date: 2021-08-20
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a limit test fixture and method for fracture of high-strength steel plates in complicated tension-compression paths. The internal micro-cracks of the sample overcome the shortcomings of the existing damage testing technology that only observes from the outside of the sample, identify the damage and fracture behavior of the steel plate with high precision, and obtain the fracture behavior data of high-strength steel under complex paths, and then realize damage and unstable fracture Behavior Accurate Prediction

Method used

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  • Limit test fixture and method for fracture of high-strength steel plate in complex tension and compression path
  • Limit test fixture and method for fracture of high-strength steel plate in complex tension and compression path
  • Limit test fixture and method for fracture of high-strength steel plate in complex tension and compression path

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Experimental program
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Effect test

Embodiment 1

[0056] S1. Paste polymer material polytetrafluoroethylene (referred to as a PTFE insulation material), and the PTFE insulation materials are symmetrically distributed on both sides of the upper backplane 1 and the lower backplane 4 and the upper cover 2 and the lower cover 3 respectively, and the surfaces that are in contact with each other can only be attached to one side. Simultaneously test Whether the fixture composed of upper backplane 1, lower backplane 4, upper cover 2 and lower cover 3 is insulated, and simultaneously test the jig composed of upper backplane 1, lower backplane 4, upper cover 2 and lower cover 3 Whether the fixture is insulated;

[0057] S2. Connect the threaded adapter 20 of the upper backplane 1 and the lower backplane 4 to the press by threading, make the comb teeth of the upper backplane 1 and the lower backplane 4 cross contact, and the comb teeth of the upper backplane 1 and the lower backplane 4 The cross height of comb teeth is adjusted accordi...

Embodiment 2

[0064] S1. Paste polymer material polytetrafluoroethylene (referred to as a PTFE), and the PTFE insulating materials are symmetrically distributed on both sides of the upper backplane 1 and lower backplane 4 and the upper cover 2 and lower cover 3 respectively, and the surfaces that are in contact with each other can only be attached to one side. Whether the fixture composed of backplane 1, lower backplane 4, upper cover 2 and lower cover 3 is insulated;

[0065] S2. Connect the threaded adapter 20 of the upper backplane 1 and the lower backplane 4 to the press by threading, make the comb teeth of the upper backplane 1 and the lower backplane 4 cross contact, and the comb teeth of the upper backplane 1 and the lower backplane 4 The cross height of comb teeth is adjusted according to the sample length of DP600 steel plate;

[0066] S3. Put the positive electrode sheet and the negative electrode sheet into the grooves 18 of the upper backplane 1 and the lower backplane 4 respec...

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Abstract

The invention provides a limit test fixture and method for fracture of a high-strength steel plate in a complex tension and compression path. The limit test fixture comprises a cover plate, a back plate, a strong spring, a gasket, a shoulder pad, comb teeth, an electrode plate and a threaded adapter. A convex block with a convex shape is arranged in the middle of the cover plate, the comb teeth and the shoulder pad are respectively arranged at the small head end of the convex block, a countersunk bolt through hole is formed in the large head end of the convex block, a convex groove is formed in the middle of the back plate, the comb teeth and the shoulder pad are respectively arranged at the small head end of the groove, and a countersunk bolt through hole and the threaded adapter are sequentially arranged at the large head end of the groove. The countersunk bolt through hole of the cover plate is fixedly connected with the countersunk bolt through hole of the back plate through the head screw, the first end of the inner hexagon screw penetrates through the strong spring to be connected with the gasket, the second end of the inner hexagon screw sequentially penetrates through the cover plate and the back plate to be fixedly connected with the nut, and the electrode plate is located in the groove of the back plate. The fracture behavior data of the high-strength steel under the complex path can be obtained, and then accurate prediction of damage and unstable fracture behaviors is achieved.

Description

technical field [0001] The invention relates to the technical field of plate forming test equipment, in particular to a limit test fixture and method for breaking high-strength steel plates in complex tension-compression paths. Background technique [0002] In the field of sheet metal forming, the plasticity index and fracture index of metal are particularly important performance indexes. How to accurately obtain the plasticity and fracture data under various paths is an important basis for formulating the forming process. The bending instability of the thin plate in the compression test leads to its low compressibility, and it is impossible to fully and accurately obtain the change law of stress and strain; the fracture of the metal is also affected by various factors such as the metal loading path and strain ratio, how to accurately obtain Fracture data to predict the damage and fracture behavior of metals is also a challenge for scientists. Especially with the developmen...

Claims

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Application Information

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IPC IPC(8): G01N3/04G01N3/06G01N3/08
CPCG01N3/04G01N3/066G01N3/08G01N2203/0003G01N2203/0017G01N2203/0019G01N2203/0617
Inventor 段永川孙莉莉张芳芳陈希
Owner YANSHAN UNIV