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The fatigue crack propagation behavior of a very wide range of engineering plastics was examined. Crack growth rates per cycle were found to be a power function of the applied stress intensity factor range. In contrast to metals, the relative performance of the polymers examined was seen to vary widely, presumably because of major differences in structural features, viscoelastic response, and deformation mechanisms. For example, it was observed that resistance to fatigue crack advance was enhanced by the presence of crystalline regions and by the addition of rubbery inclusions.
fracture properties, mechanical properties, polymers, crack propagation, fatigue tests, viscoelasticity, crosslinking
Hertzberg, R. W.
Associate professor, Lehigh University, Bethlehem, Pa.
Manson, J. A.
professor, Lehigh University, Bethlehem, Pa.
Wu, W. C.
research assistant, Lehigh University, Bethlehem, Pa.