Inverse estimation approach for elastoplastic properties using the load-displacement curve and pile-up topography of a single Berkovich indentation

• Main Authors: Kenta Goto, Ikumu Watanabe, Takahito Ohmura
• Format: Article
• Language: English
• Published: Elsevier 2020-09-01
• Series: Materials & Design
• Subjects: Elastic-plastic material; Finite elements; Mechanical testing; Indentation; Inverse analysis
• Online Access: http://www.sciencedirect.com/science/article/pii/S0264127520304597

An approach for the inverse estimation of the elastoplastic properties from a single indentation with a Berkovich indenter was developed. The relationship between the load-displacement and stress-strain curves was derived based on the equivalent energy principle, while an approximate equation for pile-up height was determined using elastic and plastic limits. The approach proposed in this study estimates the yield stress and strain-hardening exponent from hardness and pile-up height obtained from a single indentation based on these fundamental equations. The coefficients in the equations were determined in a parametric study using finite element analyses. The accuracy of the inverse estimation technique was confirmed using aluminum alloy and stainless steel samples and reference tensile testing.