Nondestructive evaluation of thermal aging of adhesive joints by using a nonlinear wave mixing technique

Taeho Ju, Jan D. Achenbach, Laurence J. Jacobs, Jianmin Qu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

This paper describes the use of a wave mixing technique to monitor thermal aging of adhesive joints. This newly developed technique measures the acoustic nonlinearity parameter of the adhesive in the joint. One of the significant features of this technique is that it requires only one-side access to the adhesive joint being measured, which significantly increases the technique's utility in field applications. To demonstrate the effectiveness of the new technique, measurements are conducted on adhesively joined samples that are thermally aged under different heating conditions, i.e., different temperature profiles and aging times. The results show that the measured acoustic nonlinearity parameter of the adhesive is very sensitive to thermal aging. On the other hand, linear reflection from the adhesive layer remains almost a constant among all the aging conditions investigated in this study. It is therefore concluded that the acoustic nonlinearity parameter is a much more sensitive measure of thermal aging of adhesive joints.

Original languageEnglish (US)
Pages (from-to)62-67
Number of pages6
JournalNDT and E International
Volume103
DOIs
StatePublished - Apr 2019

Keywords

  • Adhesive bonds
  • Nondestructive evaluation
  • Nonlinear wave mixing
  • Thermal aging

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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