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Experimental Mechanics

, Volume 43, Issue 3, pp 323–330 | Cite as

Mixed-mode failure of thin films using laser-generated shear waves

  • J. Wang
  • N. R. Sottos
  • R. L. Weaver
Article

Abstract

A new test method is developed for studying mixed-mode interfacial failure of thin films using laser generated stress waves. Guided by recent parametric studies of laser-induced tensile spallation, we successfully extend this technique to achieve mixed-mode loading conditions. By allowing an initial longitudinal wave to mode convert at an oblique surface, a high amplitude shear wave is generated in a fused silica substrate and propagated toward the thin-film surface. A shear wave is obtained with amplitude large enough to fail an Al film/fused silica interface and the corresponding shear stress calculated from high-speed interferometric displacement measurements. Examination of the interfaces failed under mixed-mode conditions reveals significant wrinkling and tearing of the film, in great contrast to blister patterns observed in similar Al films failed under tensile loading.

Key Words

Mixed-mode film failure pulsing laser shear wave mode conversion interfacial adhesion 

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Copyright information

© Society for Experimental Mechanics 2003

Authors and Affiliations

  • J. Wang
    • 1
  • N. R. Sottos
    • 2
  • R. L. Weaver
    • 2
  1. 1.Department of Mechanical EngineeringUniversity of CaliforniaRiverside
  2. 2.Department of Theoretical and Applied MechanicsUniversity of Illinois at Urbana-ChampaignUrbana

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