Determination of interfacial fracture toughness for thin film coating materials

John Jy An Wang, Ian G. Wright, Michael J. Lance, Ken C. Liu

Research output: Contribution to journalConference articlepeer-review

Abstract

A material configuration of central importance in composite materials or in protective coating technology is a thin film of one material deposited onto a substrate of a different material. Fabrication of such a structure inevitably gives rise to stress in the film due to lattice mismatch, differing coefficient of thermal expansion, chemical reactions, or other physical effects. Therefore, in general, the weakest link in this composite system often resides at the interface between the thin film and substrate. In order to make multi-layered electronic devices and structural composites with long-term reliability, the fracture behavior of the material interfaces must be known. This project is intended to address the problems associated with interface fracture toughness evaluation and offers an innovative testing procedure for the determination of interface fracture toughness applicable to thin coating materials in general.

Original languageEnglish
Article numberPVP2005-71778
Pages (from-to)229-238
Number of pages10
JournalAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume6
DOIs
StatePublished - 2005
Event2005 ASME Pressure Vessels and Piping Conference, PVP2005 - Denver, CO, United States
Duration: Jul 17 2005Jul 21 2005

Keywords

  • Composite material
  • Interface fracture toughness
  • Spiral notch
  • Thin film coating material
  • Torsion test

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