Journal
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Volume 71, Issue -, Pages 28-38Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2016.08.008
Keywords
FM300; Film adhesive; Material property; Lamb wave; Numerical simulation
Funding
- Office of Naval Research, United States under the Naval International Cooperative Opportunities in Science and Technology Program [N62909-12-1-7005]
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Lamb waves are commonly modelled in isotropic metals such as steel and aluminium which have well-known published properties. When attempting to model Lamb waves in polymer materials with viscoelastic properties such as epoxy adhesives, it is not sufficient to rely on published properties which are usually based on quasi-static mechanical testing. This is due to Lamb waves creating an elastic disturbance with a relatively low strain amplitude but high strain rate. Unlike in metals, the modulus of a viscoelastic material is dependent on strain rate. Therefore to accurately model the behaviour of Lamb waves in polymers, the properties of the host structure must be obtained using methods that reproduce the strain amplitudes and strain rates of the intended application. This paper presents an investigation of three ultrasonic methods for determining the material properties of a film adhesive. It is found that the elastic modulus required to accurately model Lamb waves in this adhesive is approximately 60% higher than the value determined by conventional quasi-static testing. Finally, a Lamb wave simulation is used to illustrate that such discrepancies can lead to significant differences in the scattered wave field from a bond:line defect. (C) 2016 Elsevier Ltd. All rights reserved.
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