Location

Brunswick, ME

Start Date

1-1-1990 12:00 AM

Description

A major unresolved problem of the ultrasonic testing of adhesive bonds concerns the relation between quantities measured by ultrasonic methods and the actual ultimate strength of the bond. In this paper it is postulated that adhesive failure is preceded by nonlinear behavior which can be represented by a simple relation between tractions and gross displacement increments across the adhesive layer. The effects of this nonlinear behavior on various wave phenomena, including reflection for normal incidence, interface waves, and antiplane transverse wave have been investigated. The overall objective is to obtain information when the adhesive is pulled in the nonlinear range, either by the wave system itself or by the application of a large static deformation on which the ultrasonic wave motion has been superimposed. The nonlinear parameters which can be extracted from the ultrasonic data, in principle allow an extrapolation to the point of adhesive failure. For a detailed discussion of adhesive failure and other failure mechanisms in adhesives, we refer to Ref. [1].

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

9B

Chapter

Chapter 8: Characterization of Materials

Section

Non-Linear Acoustic Properties

Pages

1693-1700

DOI

10.1007/978-1-4684-5772-8_218

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Wave Phenomena Related to Nonlinear Mechanical Behavior of Adhesives

Brunswick, ME

A major unresolved problem of the ultrasonic testing of adhesive bonds concerns the relation between quantities measured by ultrasonic methods and the actual ultimate strength of the bond. In this paper it is postulated that adhesive failure is preceded by nonlinear behavior which can be represented by a simple relation between tractions and gross displacement increments across the adhesive layer. The effects of this nonlinear behavior on various wave phenomena, including reflection for normal incidence, interface waves, and antiplane transverse wave have been investigated. The overall objective is to obtain information when the adhesive is pulled in the nonlinear range, either by the wave system itself or by the application of a large static deformation on which the ultrasonic wave motion has been superimposed. The nonlinear parameters which can be extracted from the ultrasonic data, in principle allow an extrapolation to the point of adhesive failure. For a detailed discussion of adhesive failure and other failure mechanisms in adhesives, we refer to Ref. [1].