Vibration damping response of composite materials
Mechanical vibration damping characteristics of glass/epoxy and graphite/epoxy composite materials were studied. The objective was to develop an analytical model that incorporates the frequency dependence of the vibration damping loss factor and to experimentally determine the loss factor for frequencies up to 1,000 Hz. The analytical model requires as input the inplane material loss factors as functions of frequency. An experimental apparatus was designed and fabricated to determine these loss factors. Cantilever beam specimens were excited using an impulse from an instrumented force hammer. The loss factor was calculated using the half power band width technique. The apparatus was calibrated using a well characterized low damping material. The effect of clamping pressure and of the clamp block to specimen interface material was also investigated. While testing the composites, it became evident that the amplitude of vibration had a pronounced effect on the calculated loss factor. The analytical model was validated using two generic laminated configurations. The model predictions fell within the scatter of the experimental data.
- Research Organization:
- Delaware Univ., Newark, DE (United States)
- OSTI ID:
- 7163989
- Country of Publication:
- United States
- Language:
- English
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