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Thermomechanical analysis of indentation behavior of thin PMMA coatings

  • R. Jayachandran
  • M. C. Boyce
  • E. Montagut
  • A. S. Argon
Research Papers
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Summary

A thermomechanically coupled finite element analysis is performed of the indentation of a thin poly(methylmethacrylate) layer attached to a steel substrate. The physically based constitutive characterization of the large strain behavior of amorphous polymers given by Arruda and Boyce [Int. J. Plasticity, 9 (1993) 697] is used. This includes strain hardening, strain-rate hardening, thermal softening and pressure-dependent aspects of yield in glassy polymers. The stress distribution and temperature rise in the coating computed from the simulations are depicted. The effects of indentation rate and coating thickness are investigated. Furthermore, the effects of heating and pressure on the material behavior during indentation have been isolated and are discussed. Possible sites of coating delamination and subsequent modes of failure of the coating are discussed.

Keywords

Indentation Polymer coating Interface failure 
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Copyright information

© ESCOM Science Publishers B.V 1995

Authors and Affiliations

  • R. Jayachandran
    • 1
  • M. C. Boyce
    • 1
  • E. Montagut
    • 1
  • A. S. Argon
    • 1
  1. 1.Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeUSA

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