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Abstract

Experimental and theoretical studies were conducted in order to unders tand and predict the effects of time, temperature, and stress on the axial failure modes of boron fibers and B/A1 composites. Due to the anelastic nature of boron fiber deformation, it was possible to determine simple creep functions which can be employed to accurately describe creep and fracture stress of as-produced fibers. Analysis of damping and strength data for B/6061 A1 composites indicates that fiber creep and the effects of creep on fiber fracture are measurably reduced by the composite fabrication process. The creep function appropriate for fibers within B/A1 composites was also determined. A fracture theory is presented for predicting the time- temperature dependence of the axial tensile strength for metal matrix com posites in general and B/A1 composites in particular.

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Predicting the Time-Temperature Dependent Axial Failure of B/A1 Composites

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