Application of acousto-ultrasonic technique in evaluation of bond strength and adhesive degradation in composite repair patch

Shiguo Rao*, Isaac M Daniel

*Corresponding author for this work

Research output: Contribution to conferencePaper

Abstract

This paper discusses the application of acousto-ultrasonic (AU) techniques for the evaluation of the strength and degradation of an adhesive bond of a composite repair patch. Both symmetric and asymmetric composite patch specimens were studied. Asymmetric specimens were divided into four groups with different bonding conditions. Results indicate that the AU parameters (AUP and correlation factor) are correlated with the interfacial bond strength. There is almost a linear relation between them, the higher the AU parameter, the higher the bond strength. For the symmetric specimen, the interfacial shear load-strain property was also obtained during destructive tests. The curve indicates typically three stages of interfacial deformation, initial linear deformation, non-linear deformation and a final linear deformation with reduced slope. Adhesive yielding causes non-linear behavior. It was found that there is a good correlation between AU parameters and the length of yield zone. Both symmetric and asymmetric specimens were tested under tension-tension fatigue. For asymmetric specimens, AU waveforms were recorded and ultrasonic C-Scanning was also used to check bond integrity at different numbers of fatigue cycles. Results show good correlation between the AU parameters and the interfacial damage.

Original languageEnglish (US)
Pages54-65
Number of pages12
StatePublished - Dec 1 1999
EventProceedings of the 1999 31st International SAMPE Technical Conference: 'Advanced Materials and Processes Preparing for the New Millennium' - Chicago, IL, USA
Duration: Oct 26 1999Oct 30 1999

Other

OtherProceedings of the 1999 31st International SAMPE Technical Conference: 'Advanced Materials and Processes Preparing for the New Millennium'
CityChicago, IL, USA
Period10/26/9910/30/99

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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