文献类型：期刊文献

英文题名：Methodology to evaluate strength properties of steel by single instrumented indentation test

作者：Huang, Liyang[1];Zhong, Jiru[1];Chen, Guoyao[1];Xu, Tong[2];Guan, Kaishu[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Meilong Rd 130, Shanghai 200237, Peoples R China;[2]China Special Equipment Inspect & Res Inst, Beijing, Peoples R China

年份：2021

卷号：56

期号：6

起止页码：404

外文期刊名：JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN

收录：;EI(收录号：20212010357197);WOS:【SCI-EXPANDED(收录号:WOS:000651169900001)】；

基金：The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors of this paper would like to express their Acknowledgement to National Key R&D program of China (2018YFC0808800) for the funding.

语种：英文

外文关键词：Instrumented indentation test; particle swarm optimization; inverse method; yield strength; ultimate tensile strength

摘要：The instrumented indentation test (IIT) is an attractive non-destructive testing technique. Determining accurate strength properties of steel using IIT is still challenging. In this paper, a new methodology is proposed to acquire the yield and ultimate tensile strength from a single IIT. This method extracts true stress-strain curves from IIT results. Acquired stress-strain curves indicate that the initial yield stress is not repeatable. This is caused by the inhomogeneous deformation of IIT specimens. Based on the obtained true stress-stain curves, corresponding yield strength, and ultimate tensile strength are calculated through theoretical derivation. The results show that the strength has a convergent tendency. On basis of this phenomenon, the strength is determined with an extrapolating method. Finally, the strength properties of Q345R are investigated to verify the reliability of this method. It is found that the strength determined from IIT and conventional tensile tests shows good agreement. The proposed method is effective in predicting strength properties from a single instrumented indentation test.