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A kind of protective device and experimental method for reflective Hopkinson tie rod sample

A protection device, reflective technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of impact contact, affecting the accuracy of test results, etc., and achieve the effect of eliminating thread gaps, simple structure, and convenient operation.

Active Publication Date: 2020-04-17
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the tensile pulse starts to load, the thread gap in the tensile direction will cause the impact contact between the sample and the rod to generate interference signals and superimpose on the incident wave, reflected wave or transmitted wave, and finally affect the accuracy of the test results

Method used

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  • A kind of protective device and experimental method for reflective Hopkinson tie rod sample
  • A kind of protective device and experimental method for reflective Hopkinson tie rod sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The sample 3 to be tested is a cylindrical tensile sample, the total length of the sample is 40mm, the diameter of the working section of the sample is 4mm, the length of the parallel section is 20mm, and the clamping end thread is M8.

[0024] The inner sleeve 1 and the outer sleeve 2 are grooved on one side, the width of the single side groove is 5mm, and the diameter of the cross-sectional circle at the bottom is 5mm. The outer surface thread of inner sleeve 1 is M10, the total length of inner sleeve 1 is 10mm; the inner thread of outer sleeve 2 is M10, the screw hole depth is 9mm, the total length of outer sleeve is 15mm, and the end surface of outer sleeve 2 in contact with the incident rod The diameter is 14.5 mm; when the inner sleeve 1 is completely screwed into the bottom of the screw hole of the outer sleeve 2, the total length of the combination of the inner sleeve 1 and the outer sleeve 2 is 19 mm.

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Abstract

The invention belongs to the field of material performance testing, and relates to a protective device of a reflection type Hopkinson pull rod test sample, and an experimental method. The protective device comprises an inner sleeve and an outer sleeve; a groove is formed in the single side of each of the inner sleeve and the outer sleeve; the cross section of the bottom of the groove is semi-circular, and the diameter and the groove width are equal; the external thread is formed on the outer surface of the inner sleeve and is connected with the internal thread at the position of a screw hole of the outer sleeve; and the diameter of the fitting end face of the outer sleeve and a working rod is equal to that of the working rod. According to the protective device of the reflection type Hopkinson pull rod test sample, and the experimental method, the experimental error generated by threaded gap in the stretching direction of the reflection type Hopkinson pull rod equipment is eliminated, the accuracy of the experimental result is improved, and operation is convenient and rapid.

Description

technical field [0001] The invention belongs to the field of material performance testing, in particular to a protective device and an experimental method for a reflective Hopkinson tie rod sample. Background technique [0002] The Hopkinson pressure bar experimental equipment is currently a commonly used research material in 10 2 ~10 3 the s -1 Experimental equipment for dynamic compressive properties at strain rate levels. However, many materials deform and fracture differently under compressive and tensile stress states, and are generally more susceptible to failure in the tensile stress state. In order to evaluate the dynamic tensile properties of materials, on the basis of the Hopkinson compression rod test equipment, people further developed the Hopkinson tension rod test equipment. At present, the Hopkinson tension rod experimental equipment mainly has two structural types: reflection type and sleeve type. Among them, the reflective Hopkinson tension rod experime...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/02
CPCG01N3/02
Inventor 刘睿惠松骁叶文君于洋宋晓云李艳锋
Owner GRIMAT ENG INST CO LTD
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