Abstract
The fatigue strength of the injection molded POM of three kinds of molecular weight was investigated by observing the crack-tip whitening area continuously and quantitatively with the aid of an image processing technique. The fatigue life of the lowest molecular weight specimen was not the shortest ; and the one having the highest molecular weight, whose crystallinity was the lowest, showed minimum fatigue strength because of the rather low energy dissipation at he crack-tip whitening area under the cyclic load condition. Under a certain cooling rate condition, in the case of injection molding, an optimum molecular weight was found to exist in connection with the fatigue strength, in which also the crystallinity would play an important part.
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