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Test piece positioning device for split Hopkinson pressure bar

A Hopkinson pressure bar and positioning device technology, applied in the direction of measuring devices, analytical materials, instruments, etc., can solve problems such as errors and inconvenient positioning of specimens, and achieve the effect of accurate test data

Active Publication Date: 2021-03-30
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The separate Hopkinson compression rod in the prior art is inconvenient to locate the specimen during use, and the experimental results may have errors due to the different axes of the incident rod and the transmission rod

Method used

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  • Test piece positioning device for split Hopkinson pressure bar
  • Test piece positioning device for split Hopkinson pressure bar
  • Test piece positioning device for split Hopkinson pressure bar

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027] Please refer to figure 1 , the present embodiment provides a separate Hopkinson compression bar test piece positioning device, which includes a bearing plate 1 equipped with positioning elements, a cam plate 2 and a connecting piece to realize the positioning of test pieces of various sizes, the carrying plate 1 and The cam disc 2 is connected by a connecting piece, the connecting piece includes a bolt 8, a flat washer 9 and a nut 10, and the positioning element includes an inner ring body 4, a driven rod 5, a spring 6 and a roller 7. The cam disc 2 of this embodiment, the bearing The disc 1, the inner ring body 4 and the driven rod 5 are all made of aluminum alloy. There are three driven rods 5, and the three driven rods 5 are radially and symmetrically distributed. The roller 7 is connected to the driven rod 5, and the spring 6 Set on the driven rod 5, the driven rod 5 is connected to the inner ring body 4, and the inner surface of the cam plate 2 is provided with a p...

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PUM

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Abstract

The invention discloses a test piece positioning device for a split Hopkinson pressure bar. The test piece positioning device comprises a bearing disc, a cam disc and a connecting piece; the bearing disc is connected with the cam disc through the connecting piece; the connecting piece comprises a bolt, a flat gasket and a nut; a positioning element is arranged in the bearing disc and comprises aninner ring body, a driven rod, a spring and a roller; and the bearing disc and the cam disc can rotate relatively, so that the roller rolls on the surface of the convex structure of the cam disc, so as to drive the driven rod to compress the spring, and at the same time, the inner end of the driven rod gets close to position a test piece, and then the driven rod returns to the initial state through the loosening of the connecting piece and deformation recovery of the spring. With the device adopted, the defect that errors are generated due to the fact that the test piece is not coaxial with anincident bar and a transmission bar can be eliminated, and therefore more accurate test data can be obtained.

Description

technical field [0001] The invention relates to the technical field of experimental devices, in particular to a positioning device for a separated Hopkinson compression bar specimen. Background technique [0002] The Hopkinson compression bar technique was originally proposed by Hopkinson in 1914, and it was used to measure the pulse waveform under the impact load. [0003] The split Hopkinson compression rod is to divide the compression rod into two parts, one is the incident rod and the other is the transmission rod. The test piece is placed in the middle of the two rods, and the stress-strain relationship of the material is measured under the action of impact load. This technology was first proposed by Hopkinson in 1914. After Kolsky's improvement in 1949, the prototype of the separate Hopkinson compression bar technology appeared. So this technique is called split Hopkinson bar, or Kolsky bar. After that, with the joint efforts of researchers at home and abroad, this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/02G01N3/04
CPCG01N3/02G01N3/04
Inventor 王战江冉鹏飞秦娜
Owner SOUTHWEST JIAOTONG UNIV
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