In this paper, thermal treatments of Kevlar-29 fiber resulted in a significant enhancement of compressive strength and corresponding decrease in tensile strength. These changes result from a decreased linearity at the macroscopic level in the fiber. Statistically designed experiments indicate that treatment temperature is the most significant variable in the thermal processing, while treatment soak time also played a role in the shift of properties.
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Sweeney et al. (2002) studied this question.
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