Metal material high-strain-rate tensile test control method

By placing pulse absorbing rods and tubes in the Hopkinson tensile rod device and calculating the spacing using stress wave theory, the problem of repeated compression-tension pulse loading in high strain rate tensile tests was solved, achieving pure tensile loading of the specimen and accurate test results.

CN122448640APending Publication Date: 2026-07-24SHANDONG NON METALLIC MATERIAL RESEARCH INSTITUTE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG NON METALLIC MATERIAL RESEARCH INSTITUTE
Filing Date
2026-06-03
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

In high strain rate tensile tests, the metal specimen is subjected to repeated compression-tension pulse loading due to the reflection of one-dimensional stress wave pulses, resulting in unrealistic and unreliable test results.

Method used

By placing a pulse absorbing rod and a pulse absorbing tube in the Hopkinson tensile rod device, and calculating the installation distance between the pulse absorbing rod and the input rod flange using stress wave propagation theory, it is ensured that the reflected compression pulse is completely absorbed without sacrificing the incident tensile wave amplitude, thus achieving pure tensile loading of the specimen.

Benefits of technology

It achieves pure tensile loading of specimens under high strain rates, ensuring the accuracy and reliability of test results. It is suitable for testing metallic materials that are sensitive to loading amplitude, and the device is simple and easy to implement, making it easy to promote.

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Abstract

The present application belongs to the technical field of Hopkinson bar test, and relates to a kind of metal material high strain rate true tensile test control method, and the relationship between launch air pressure and impact sleeve velocity is established;According to the impact sleeve velocity V and the impact sleeve length L, the distance between the pulse absorber and the input rod flange is calculated as follows: △=L×V / C;The test system is assembled according to the calculated distance;Impact test is carried out and strain signal is collected;Finally, the stress-strain curve is obtained by calculation.The present application accurately calculates the dynamic matching distance between the absorber and the flange, fully absorbs the reflected compression wave without sacrificing the incident tensile wave amplitude, solves the problem of repeated "tension-compression" loading in traditional methods, and has higher test accuracy and material applicability.The test system of the present application has simple structure, the control method is easy to operate, the test results have good repeatability, and is suitable for high strain rate true tensile test of various metal materials.
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