Abstract
Mechanisms of fatigue damage in ABS and HIPS polymers were studied by monitoring changes in mechanical properties under sinusoidal and square wave loading at a frequency of 0.033 Hz. Both materials exhibited a large increase in hysteresis and a decrease in modulus. In ABS, these changes occurred to approximately the same extent in tension and compression, whereas in HIPS the changes in tensile properties were much more pronounced. From the shape of the hysteresis loops, and from volumetric measurements, it was concluded that crazing is the dominent fatigue damage mechanism in HIPS, whilst shear yielding is responsible for most of the damage observed in ABS. Large increases in hysteresis caused substantial rises in temperature despite the low frequency, and thus accelerated fatigue damage accumulation.
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Bucknall, C.B., Stevens, W.W. Rubber toughening of plastics. J Mater Sci 15, 2950–2958 (1980). https://doi.org/10.1007/BF00550360
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DOI: https://doi.org/10.1007/BF00550360