Ultrasonic Evaluation of Thermal Degradation in Adhesive Bonds

  • Shyh-Shiuh Lih
  • Ajit K. Mal
  • Yoseph Bar-Cohen


The critical role played by adhesive bonds in lap joints is well known. A good knowledge of the mechanical properties of adhesive bonds in lap joints is a prerequisite to the design and reliable prediction of the performance of these bonded structures. Furthermore, the lap joint may be subject to high-temperature environments in service. Early detection of the degree of thermal degradation in adhesive bonds is required under these circumstances. A variety of ultrasonic nondestructive evaluation (NDE) techniques can be used to determine the thickness and the elastic moduli of adhesively bonded joints [1–4]. In this paper we apply a previously developed technique based on the leaky Lamb wave (LLW) experiment to investigate the possibility of characterizing the thermal degradation of adhesive bonds in lap joints. The degradation of the adhesive bonds is determined through comparison between experimental data and theoretical calculations.


Thermal Degradation Dispersion Curve Adhesive Bond Lamb Wave Adhesive Joint 
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Copyright information

© Plenum Press, New York 1995

Authors and Affiliations

  • Shyh-Shiuh Lih
    • 1
  • Ajit K. Mal
    • 1
  • Yoseph Bar-Cohen
    • 2
  1. 1.Mechanical, Aerospace and Nuclear Engineering DepartmentUniversity of CaliforniaLos AngelesUSA
  2. 2.Jet Propulsion LaboratoryPasadenaUSA

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