Effect of casting defect and stress ratio on fatigue life under uniaXial cyclic load are investigated fc )r products made of aluminum anoy die castings . The nlaill results are as follows . ( 1)Fatigue hmit becomes smaU as a defect becomes large. Efect of casting defect can be quanti 丘ed by using the stress intensity factor range . ( 2)Minimum community stress intensity factor range which does not cause fatigue destruction and which are conditions is changed by the stress ratio , and is not an absolute value .
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