A unified correlation model describing global properties at elastoplastic sharp indentation contact. (November 2016)

• Record Type: Journal Article
• Authors: Olsson, Erik; Larsson, Per-Lennart
• Is Part Of: Tribology international. Volume 103(2016)
• Page Start: 252
• Page End: 260
• Publication Date: 2016-11
• Subjects: Sharp indentation -- Elastic–plastic materials -- Correlation -- Indentation hardness; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2016.07.005
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The correlation of sharp indentation testing is analyzed and discussed based on present and previous numerical findings. In particular, correlation of two global indentation properties, hardness and relative contact area, at sharp indentation of classical elastic–plastic materials is discussed in detail. It is shown that the results cannot in general, and in particular at high strain hardening, be correlated accurately using a single parameter, comprising both geometrical and mechanical properties, with the uniaxial stress-strain curve represented by the flow stress at a representative value on the effective plastic strain. Instead, also the level of the plastic hardening must be considered. Based on this finding, a unified model for correlation of global properties is presented for cone indentation of elastoplastic materials. Highlights: Cone indentation is studied numerically for a wide range of different materials. The results can in general not be correlated using only a single parameter. Substantial differences are seen for materials experiencing strong hardening. Closed – form expressions are presented in the form of a unified correlation model.