Effects of ‘sinking in’ and ‘piling up’ on estimating the contact area under load in indentation

Yang Tse Cheng, Che Min Cheng

Research output: Contribution to journalArticlepeer-review

127 Scopus citations

Abstract

The phenomena of the ‘piling up’ and ‘sinking-in’ of surface profiles in conical indentation in elastic-plastic solids with work hardening are studied using dimensional and finite-element analysis. The degree of sinking in and piling up is shown to depend on the ratio of the initial yield strength Y to Young’s modulus E and on the work-hardening exponent n. The widely used procedure proposed by Oliver and Pharr for estimating contact depth is then evaluated systematically. By comparing the contact depth obtained directly from finite-element calculations with that obtained from the initial unloading slope using the Oliver-Pharr procedure, the applicability of the procedure is discussed.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
JournalPhilosophical Magazine Letters
Volume78
Issue number2
DOIs
StatePublished - Aug 1998

ASJC Scopus subject areas

  • Condensed Matter Physics

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