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DAMPING AND FATIGUE PROPERTIES OF SANDWICH CONFIGURATIONS IN FLEXURE
MINNESOTA UNIV MINNEAPOLIS
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A combined theoretical and experimental study was undertaken to develop an analytical approach for predicting the damping of sandwich configurations in flexure. The theory developed analyzes the various contributions to total damping, considering stress distribution and unit damping properties of skin and core, and employs a simple summation process to determine the damping of the composite. To confirm the theory, a special test set-up was developed in which sandwich configurations were vibrated as free-free beams utilizing electromagnetic excitation. A s ries of tests were performed on several types of conventional sandwich beams. Damping predicted by the theory was in good agreement ith ha measured experi ent lly Fatigue tests were also performed in the specially designed damping machine and S-N curves are presented. Methods of failures and influence of discontinuities are discussed. Author
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