Novel small punch testing method and its application to conversion of mechanical properties for aerospace materials

被引：0
|
作者：
Li J. [1 ]
Han G. [2 ]
Xiong J. [1 ]
Zhou T. [2 ]
Cai L. [2 ]
机构：
[1] Chengdu Aircraft Industrial （Group）Co. Ltd., Chengdu
[2] Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu
来源：
Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica | 2024年 / 45卷 / 03期
基金：
中国国家自然科学基金;
关键词：
energy density equivalence; small punch test; strength; stress-strain relationship; testing method;
D O I：
10.7527/S1000-6893.2023.28708
中图分类号：
学科分类号：
摘要：
For the small punch test with the advantage of slightly damaged sampling，a theoretical model was derived based on the energy density equivalence principle to describe the relationships among the load，displacement，geometric size，and uniaxial mechanical law parameters. A novel small punch test method was then proposed for aerospace materials to convert mechanical properties between uniaxial tensile test results and small punch test results. Small punch tests and uniaxial tensile tests were carried out on five aerospace materials. The results show that the stress-strain curves obtained by the new method were in close agreement with those obtained by uniaxial tensile tests；the relative errors of the elastic moduli obtained by the new method results and the uniaxial tensile test results were within 10%；and the relative errors of the yield strengths and tensile strengths obtained by the two methods were mostly within 5%. The proposed method is expected to promote the application of SPT for the safety evaluation of in-service structures. © 2024 Chinese Society of Astronautics. All rights reserved.
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