Journal
NDT & E INTERNATIONAL
Volume 70, Issue -, Pages 9-15Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ndteint.2014.11.002
Keywords
Nonlinear ultrasonics; Fatigue damage; Adhesive joints; Non-destructive evaluation
Funding
- National Natural Science Foundation of China [11472039]
- National Basic Research Program of China [2010CB732104]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1613640] Funding Source: National Science Foundation
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An experimental method based on the nonlinear ultrasonic technique is presented to evaluate fatigue damage of an adhesive joint. In this paper, specimens made from AZ31 magnesium-aluminum alloy bonded through an epoxy layer are subjected to a fatigue load. The ultrasonic harmonics generated due to damage within the adhesive layer are measured; and the acoustic nonlinearity parameter (ANP) based on the fundamental and second harmonics is determined. The results show that the normalized ANP increases with the fatigue cycles. Furthermore, a theoretical model with different interfacial compression and tension stiffness is proposed to interpret the generation of second harmonics. (C) 2014 Elsevier Ltd. All rights reserved.
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