Fracture of graphite composites under shock loading

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Abstract
A previously obtained set of experimental data on the failure of three-dimensional graphite composites under shock loading was examined. The critical event was determined to be fracture in the fiber bundles parallel to the shock direction. Physical considerations, as well as a simple approximate equation and a computer model of the fiber bundle fracture, show rather definitely that for pulse widths less than 0.5 μsec the variability in the strength of the individual fibers is the primary cause of the observed stress–pulse-width relationship. The assumptions of the computer model include a static stress concentration around the broken fibers and a fiber strength described by an extreme value distribution.

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