文献类型：期刊文献

英文题名：Estimation of tensile strengths of metals using spherical indentation test and database

作者：Chen, Guoyao[1];Zhong, Jiru[1];Zhang, Xiaocheng[1];Guan, Kaishu[1];Wang, Qiongqi[1];Shi, Jin[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2021

卷号：189

外文期刊名：INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING

收录：;EI(收录号：20205209693528);WOS:【SCI-EXPANDED(收录号:WOS:000614145400022)】；

基金：The authors are grateful to the National Key R&D Program of China (2018YFC0808800) for providing financial support.

语种：英文

外文关键词：Spherical indentation test; Database method; Strength evaluation; Finite element analysis

摘要：The indentation technique provides a non-destructive characterization method for in-service equipment. Recent years have seen an increased interest in determination of tensile properties from spherical indentation test (SIT) through inverse optimization theory, while this approach is computational costing and time consuming. This paper aims to propose a novel method for estimation of strength properties based on the application of a database. Firstly, systematically varied Ludwik constitutive parameter vectors were used to establish a database that contains indentation force-depth curves (extracted from the simulated results of indentation test) and corresponding strength values (calculated with the parameter vectors). The indentation force-depth curve of a concerned material was then processed by the database, as a result of which the yield and ultimate strengths can be obtained. A series of virtual materials were used to validate the accuracy of this method. The results show that the database method provides an impressive accuracy and stability in estimating strengths. The database method was subsequently applied to eight real materials. It is found that the predicted strengths agree well with the values from uniaxial tests for most materials, while the database method may be not suitable for materials that show obvious tension-compression asymmetry.