Studies of the Dynamic Fracture Characteristics of Composites
Final rept. Jan 1970-Jan 1971
FLORIDA UNIV GAINESVILLE
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The wave propagation behavior of composite bar specimens of variable fiber spacing and orientation is investigated. Controlled geometry composite plates have been fabricated and impact tested to determine their failurefracture characteristics. Wave propagation studies have been conducted on long rods with single filament lamina as well as continuous filament composite rods with variable filament orientation. A square wave input has been introduced into the rods, and wave speed, attenuation, and dispersion have been investigated. Analytical criteria have been considered to model a single lamina composite bar in order to isolate the influence of a single interface on wave speed, attenuation and dispersion. These results have been examined for correlation with multiple filament rods. Various geometry plate specimens have been fabricated and impact tested to determine their energy-absorbing characteristics and failurefracture modes. Penetrator specimens of a model composite geometry type have been impact tested against variable density targets to investigate the possibility of producing controlled fracture characteristics.
- Laminates and Composite Materials