Revelation of a functional dependence of the sum of two uniaxial strengths/hardness on elastic work/total work of indentation

Dejun Ma, Taihua Zhang, Chung Wo Ong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)

Abstract

Dimensional and finite element analyses were used to analyze the relationship between the mechanical properties and instrumented indentation response of materials. Results revealed the existence of a functional dependence of (engineering yield strength σE,y+ engineering tensile strength σE,b)/Oliver & Pharr hardness on the ratio of reversible elastic work to total work obtained from an indentation test. The relationship links up the Oliver & Pharr hardness with the material strengths, although the Oliver & Pharr hardness may deviate from the true hardness when sinking in or piling up occurs. The functional relationship can further be used to estimate the sum σE,y+ σE,baccording to the data of an instrumented indentation test. The σE,y+ σE,bvalue better reflects the strength of a material compared to the hardness value alone. The method was shown to be effective when applied to aluminum alloys. The relationship can further be used to estimate the fatigue limits, which are usually obtained from macroscopic fatigue tests in different modes.
Original languageEnglish
Pages (from-to)895-903
Number of pages9
JournalJournal of Materials Research
Volume21
Issue number4
DOIs
Publication statusPublished - 1 Apr 2006

ASJC Scopus subject areas

  • Materials Science(all)

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