Dis-Bond Detection and the Possibility of Interfacial Stiffness Measurement with Real-Time Impulsive Stimulated Thermal Scattering

John A. Rogers, Keith A. Nelson

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We describe a new, real-time, noninvasive method for dis-bond (delamination) detection which is based on a technique known as impulsive stimulated thermal scattering (ISTS). We first explain the ISTS technique and compare data from polyimide films tightly bound to silicon substrates with data from unsupported polyimide films. The observed differences in the data from these two cases are readily understandable and offer an unmistakable signature for delaminations. We demonstrate ISTS dis-bond detection by locating and mapping out randomly-distributed and spatially-fine regions of delamination in a polyimide film-silicon substrate system. Finally, we present two simple physical models of the interfacial region which comprehensively describe acoustic data from the tightly-bound and the unsupported samples. With insight from simulations using these models, we suggest how ISTS might be used to determine interfacial adhesion quality and we show how ISTS sensitivity to interfacial effects can be adjusted.

Original languageEnglish (US)
Pages (from-to)1-24
Number of pages24
JournalThe Journal of Adhesion
Volume50
Issue number1
DOIs
StatePublished - 1995

Keywords

  • adhesion
  • dis-bond
  • evaluation
  • interfacial stiffness
  • interphase
  • noncontact nondestructive
  • photo-acoustics
  • surface acoustic waves
  • ultrasonic

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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