Influence of Stress Ratio and Loading Condition on Near-threshold Fatigue Crack Growth Behaviour
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG1993年第1期
论文作者：B.Weiss R.Stickler
文章页码：47 - 52
摘 要：<正> Near-threshold fatigue crack propagation behaviour of a cold-worked copper tested with distinct fa-tigue testing systems under different stress ratios has been investigated.The emphasis was placed onthe evaluation of crack closure effect as well as the effective fatigue threshold,It was found that thefatigue threshold for R=0 is higher than those for R=-1 and R=0.4,for which almost the samethreshold value was derived.Compared with the conventional closure evaluation method,the pro-posed new closure evaluation method can generally interpret the dependence of the fatigue thresh-old on stress ratio and loading condition,and leads to a higher and relatively constant effective fa-tigue threshold of about 3 MPa·m1/2 for the cold-worked copper at different stress ratios andloading conditions.
B.Weiss，R.Stickler
摘 要：<正> Near-threshold fatigue crack propagation behaviour of a cold-worked copper tested with distinct fa-tigue testing systems under different stress ratios has been investigated.The emphasis was placed onthe evaluation of crack closure effect as well as the effective fatigue threshold,It was found that thefatigue threshold for R=0 is higher than those for R=-1 and R=0.4,for which almost the samethreshold value was derived.Compared with the conventional closure evaluation method,the pro-posed new closure evaluation method can generally interpret the dependence of the fatigue thresh-old on stress ratio and loading condition,and leads to a higher and relatively constant effective fa-tigue threshold of about 3 MPa·m1/2 for the cold-worked copper at different stress ratios andloading conditions.
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