Measurement of Adhesion Strength of Bonds Using Nonlinear Acoustics
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
It is well known that the nonlinear elastic behavior of solids modulates transmitting ultrasonic wave [1], Higher harmonics of the fundamental frequency are generated, especially second harmonics describing the deviation from the linear elastic behavior of the solid. Some effects were also observed in ultrasonic velocity [2] and transmission of ultrasound [3] due to the nonlinear elastic behavior of interfaces. In general, reduced bonding of joined materials causes a strong nonlinear elastic behavior [4]. We exploit this for the observation of the modulation of the ultrasonic wave at interfaces [5,6]. There exist several models based on a macroscopic description of the interface restoring forces using for example the extended Hooke’s Law [7] or nonlinear spring relations [3,8].