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Ultrasonic Evaluation of Thermal Degradation in Adhesive BondsThe 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. 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.
Document ID
20060037879
Acquisition Source
Jet Propulsion Laboratory
Document Type
Preprint (Draft being sent to journal)
External Source(s)
Authors
Lih, Shyh-Shiuh
Mal, Ajit K.
Bar-Cohen, Yoseph
Date Acquired
August 23, 2013
Publication Date
July 31, 1994
Subject Category
Quality Assurance And Reliability
Distribution Limits
Public
Copyright
Other
Keywords
degradation lap joints mechanical properties bonded structures leaky Lamb wave
ultrasonic adhesive bonds NDE nondestructive evaluation high-temperature

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