Stress relaxation behavior of short Kevlar fiber‐reinforced thermoplastic polyurethane (TPU) is studied with respect to strain level, strain rate, fiber loading, and fiber orientation and temperature. The existence of a two‐step relaxation mechanism for unfilled stock and a three‐stage relaxation mechanism for the fiber‐filled stock is reported.
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Narayanankutty et al. (1991) studied this question.