Relationships between initial unloading slope, contact depth, and mechanical properties for conical indentation in linear viscoelastic solids

Yang Tse Cheng, Che Min Cheng

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

Using analytical and finite element modeling, we studied conical indentation in linear viscoelastic solids with either displacement or load as the independent variable. We examine the relationships between initial unloading slope, contact depth, and viscoelastic properties for various loading conditions such as constant displacement rate, constant loading rate, and constant indentation strain rate. We then discuss whether the Oliver-Pharr method for determining contact depth, originally proposed for indentation in elastic and elastic-plastic solids, is applicable to indentation in viscoelastic solids. We conclude with a few comments about two commonly used experimental procedures for indentation measurements in viscoelastic solids: the "hold-at-peak-load" technique and the constant indentation strain-rate method.

Original languageEnglish
Pages (from-to)1046-1053
Number of pages8
JournalJournal of Materials Research
Volume20
Issue number4
DOIs
StatePublished - Apr 2005

Bibliographical note

Funding Information:
The authors would like to thank Wangyang Ni, Mike Lukitsch, Yue Qi, Tom Perry, Wes Capehart, Lou Hector, and Mark W. Verbrugge for valuable discussions. C-M. Cheng would like to acknowledge partial support from the National Science Foundation of China, Project No. 10372101.

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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