Axial-load fatigue tests a stress ratio of zero were performed on notched and unnotched sheet specimens of 61S-T6 aluminum alloy and 347 and 403 stainless steels. Special emphasis was placed on tests at high stress levels producing failures in small numbers of cycles. It was found that the stress- concentration factors effective in fatigue of notched specimens were somewhat less than theoretical elastic values at low stresses and were approximately ...
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