A Method to Estimate Residual Stress in Austenitic Stainless Steel Using a Microindentation Test

作者：Yonezu Akio^*; Kusano Ryota; Hiyoshi Tomohiro; Chen Xi

来源：Journal of Materials Engineering and Performance, 2015, 24(1): 362-372.

DOI：10.1007/s11665-014-1280-5

• austenitic stainless steel
• indentation test
• pre-strain
• residual stress
• reverse analysis

This study proposed a method to evaluate the residual stress and plastic strain of an austenitic stainless steel using a microindentation test. The austenitic stainless steel SUS316L obeys the Ludwick's work hardening law and is subjected to in-plane equi-biaxial residual stress. A numerical experiment with the finite element method (FEM) was carried out to simulate an indentation test for SUS316L having various plastic strains (pre-strains) and residual stresses. It was found that the indentation force increased with increasing pre-strain as well as with compressive residual stress. Next, a parametric FEM study by changing both residual stress sigma(res) and pre-strain epsilon(pre) was conducted to deduce the relationship between the indentation curve and the parameters epsilon(pre) and sigma(res) (which were employed for the FEM study). This relationship can be expressed by a dimensionless function with simple formulae. Thus, the present method can estimate both epsilon(pre) and sigma(res), when a single indentation test is applied to SUS316L.

• 出版日期2015-1
• 单位西安交通大学