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Fractographic Reassessment of the Significance of Fatigue Crack Closure

机译:疲劳裂纹闭合意义的分接收重新评估

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Experiments were performed on Al-alloy test coupons under specially programmed variable amplitude load sequences to assess crack closure as well as actual microscopic crack extension. Quantitative fractography of the fractures suggests that closure can account for only a fraction of observed load interaction effects. Much of the observed retardation may be attributed to the shielding effect of the overload plastic zone, which can occur even if the crack is fully open. The study also indicates that load sequence effects attributed to notch root stress-strain hysteresis can occur only if closure is absent.
机译:在特殊编程的可变幅度载荷序列下对Al合金试样进行实验,以评估裂纹闭合以及实际的微观裂缝延伸。裂缝的定量式断裂表明,闭合可以仅考虑观察到的负荷相互作用效应的一部分。大部分观察到的延迟可归因于过载塑料区的屏蔽效果,即使裂缝完全打开也可能发生。该研究还表明,仅在不存在闭合时归因于缺口根应力 - 应变滞后的负载序列效应。

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