【摘要】 在材料试验机上对铸造A713铝合金进行四点弯曲疲劳试验,并通过一种评价疲劳性能的新方法获得了该合金的疲劳弱点密度和强度曲线。结果表明:试验获得的铸造A713铝合金的疲劳强度为94.5MPa;该合金的疲劳弱点密度符合Weibull分布方程,疲劳弱点强度在应力水平为65%时最大;与气孔尺寸分布相比,疲劳弱点密度和强度的分布更适合作为材料疲劳性能的评价指标。更多还原

【Abstract】 The four points bending fatigue test was applied to A713 cast aluminum alloy by a material tester,and the curves of the density and strength of fatigue weakest link of the alloy were obtained by a new method of evaluating fatigue property.The results show that the fatigue strength of A713 cast aluminum alloy obtained by this method was 94.5 MPa.The fatigue weakest link density corresponded with Weibull distribution equation,and the fatigue weakest link strength was maximum when the stress level was 65%.Compared with pore size distribution,the distribution of density and strength of fatigue weakest link was more suitable to be used as the evaluation index of fatigue property of materials.更多还原