Microindentation induced debonding of polymer thin films from rigid substrates

Y. Lu, D. M. Shinozaki

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


A microindenter in the form of a flat cylindrical punch (10 μm < diameter < 100 μm) is used to measure the interfacial shear strength of polymer coatings on relatively rigid substrates. The penetration of the displacement controlled tip in the polymer results in a plastic zone ahead of the moving tip, which generates a large interracial shear stress. An analysis based on a modified shear lag model can be used to estimate the critical shear stress at which failure of the interface initiates. The test can be used for hard and soft polymers such as polymethylmethacrylate, polystyrene and high impact polystyrene. The thickness of coating which can be tested is shown to be approximately equal to the diameter of the tip.

Original languageEnglish
Pages (from-to)1283-1293
Number of pages11
JournalJournal of Materials Science
Issue number7
StatePublished - Apr 1 2002

Bibliographical note

Funding Information:
The financial support of NSERC, ESTAC and MMO are gratefully acknowledged.

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanics of Materials
  • Mechanical Engineering


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