THE EFFECT OF PROPORTIONAL OVERLOAD ON THE LOW CYCLE TENSION-TENSION FATIGUE LIFE OF ALUMINIUM ALLOY PLATE WITH CIRCULAR HOLE

It is presented in this paper the experimental study of low-cycle fatigue with constant amplitude and overload for aluminium alloy plate with circular hole.During the research six different over load ratios have been selected and different over load cycles have been carried out.It is concluded that for each given over load ratio, the over load fatigue life ratio(ratio of fatigue life for over loaded specimen over the fatigue life for constant amplitude specimen)increases with the increase of over load cycle...