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Interface Damping at Riveted Joints. Part II: Damping and Fatigue Measurements

Report Number: ASD TR 61-467 Part II
Author: Eaton, D. C. G.
Author: Mead, D. J.
Corporate Author: University of Southampton
Laboratory: Air Force Materials Laboratory
Date of Publication: 1965-08
Pages: 57
Contract: AF-61(052)-504
Project: 7351 - Metallic Materials
Task: 735106 - Behavior of Metals
AD Number: AD0473203

This report describes experiments carried out to verify the theories of ASD Technical Report 61-467, Part I, which predicted the energy dissipation in a simple lap joint with a visco-elastic interfacial layer. The effect of the visco-elastic layer on the fatigue life of such a joint is also investigated. The complex shear modulus of the visco-elastic material used (Polyvinyl Actetate) has been measured for a range of frequencies and temperatures. This permitted an optimum joint configuration to be chosen and provided data for comparing theoretical with experimental values of the energy dissipated in the joint. Experiments on singly riveted lap joints have indicated that a considerable damping increment can be obtained by the addition of the damping layer, although the magnitude varies considerably with frequency and temperature. Fatigue tests on singly riveted lap joints have indicated that, within the limits of the investigation, the presence of the visco-elastic layer improves the fatigue life of the joint.

Lockheed Martin Missiles & Fire Control
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