An investigation is made into acoustic resonance methods for measuring the dynamic elastic modulus of the adhesive layer in a bonded metal-to-metal joint. Empirical studies have indicated that this parameter may be used to infer the cohesive strength of the bond; in theory, an accurate measurement of two or more resonant frequencies should give both the elastic modulus and thickness of the adhesive layer. Verifying the accuracy of the technique was greatly hampered by the strong dependence of elastic properties in the adhesive on the test frequency.
The resonant frequencies of aluminum-to-aluminum adhesive joints were determined by both contact and immersion acoustic resonance techniques; receptance analysis was then used to determine the elastic modulus. Results were consistent with those achieved by time-of-flight measurements on bulk adhesive specimens. Based on these tests, inherent limitations of the Fokker Mark II Bondtester for assessing the cohesive strength of a bond were explored.
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