Use of hardness, PIP and tensile testing to obtain stress-strain relationships for metals

• DOI: 10.1016/j.mechmat.2023.104846
• Publication Date: 2023-10-27T11:07:17Z
• Authors: T.J.F. Southern; J.E. Campbell; C. Fang; A. Nemcova; A. Bannister; T.W. Clyne
• Keywords: Indentation; Tensile testing; Stress–strain curve

Both hardness testing and Profilometry-based Indentation Plastometry (PIP) can be used to obtain features of (tensile) stress-strain curves. The two tests are superficially similar, involving penetration (under a known load) an indenter into the flat surface sample, followed by measurement dimensional characteristics residual indent. associated data handling procedures, however, very different in types test. Hardness numbers, which commonly based on lateral extent or depth indent, essentially give semi-quantitative indication resistance plastic deformation: going beyond this infer (nominal) curve – notably yield stress (YS) Ultimate Tensile Stress (UTS) only done via empirical correlations (often restricted certain alloy). PIP testing, other hand, involves complete indent profile, (automated) iterative FEM modelling indentation, allowing (true) obtained. This paper covers application both approaches 12 alloys, with inferred being compared those from tensile testing. Insights provided relating levels detail reliability offered procedures.