Abstract
Recent investigations of the effects of environmental conditions on the vibration characteristics of automotive composite materials have led to the extensive modification of an existing forced-vibration technique. Resonant response of the specimen is now measured by using noncontacting eddy-current probes instead of strain gages, and the method of clamping the specimen has been improved. Excitation-response data is obtained in digital form rather than by photographing Lissajous patterns. The errors introduced by new and old techniques and representative data for E-glasslpolyester automotive composite materials are discussed.
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