Abstract
A model is presented for the dynamic compressive response of polymer matrix fiber composites. The model includes the effects of fiber misalignment and material nonlinearity as well as material inertia. The role of fiber bending stiffness is included via a couple stress formulation. The response of fiber composites to suddenly applied, constant compressive axial load is examined. It is found that under constant load, inertial effects contribute to a reduction in the critical stress for composite failure. This reduction is greatest for composites with long initial fiber imperfection wavelengths. For a given load, there is a range of initial fiber imperfection wavelengths that will result in composite failure. Within this range, there is a preferred wavelength, which results in the shortest failure time.
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