Abstract
The fatigue crack propagation (FCP) response of impact-modified nylon was investigated as a function of rubbery second phase content and absorbed water level. Particular attention was given to the influence of these material variables on the amount of hysteretic heating as measured with an infrared microscope. FCP resistance was raised when heating was localized near the crack tip, but lowered by more generalized specimen heating. Variations in FCP behaviour were found to depend strongly on changes in the dynamic storage and loss moduli resulting from hysteretic heating, with the heating-induced modulus changes being more important than the absolute temperature increase of the sample. The combination of rubbery phase and absorbed water produced greater specimen heating and, in general, produced poorer FCP resistance than with the presence of either factor alone.
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