A new conception explores how understressing enhances fatigue life by altering crack geometry.
A new conception different from the existing one is presented in connection with the effect of understressing. It maintains that the cracks initiated by an understressing improves the fatigue life of a specimen for a higher stressing and that this is attributed to the favourable change in shape at the tips of stationary cracks caused by the subsequent understressing.
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OKUBO et al. (1969) studied this question.
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