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首页> 外文会议>Mechanisms and mechanics of fracture: The John Knott symposium >CRACKS AND NOTCHES: AN IDEA OF JOHN'S THAT I'M STILL WORKING ON
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CRACKS AND NOTCHES: AN IDEA OF JOHN'S THAT I'M STILL WORKING ON

机译：裂缝和缺口：约翰的想法我还在努力

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摘要

Sitting in The Eagle pub in Cambridge in 1982, John Knott suggested to me an idea for a final-year project. By carrying out fatigue tests on cracks which had been previously blunted by applying a high load, we could investigate the transition from crack-like to notch-like behaviour. The project went well, but left a few unanswered questions, and twenty years later I'm still working on it. This paper summarises the subsequent work on high-cycle fatigue behaviour of stress concentrators, including size effects, complex three-dimensional shapes and welded joints. Some age-old critical-distance methods are brought up to date with the help of fracture mechanics, and it is argued that a critical-distance approach produces a theoretical model capable of predicting behaviour in both cracks and notches, which is thus more generally applicable than LEFM.
机译：John Knott于1982年坐在剑桥的Eagle酒吧，为我建议了一个最后一年的项目。通过施加高负荷预先钝化的裂缝进行疲劳试验，我们可以研究从裂缝状的过渡到缺口的行为。该项目进展顺利，但留下了一些未解决的问题，二十年后我仍在努力。本文总结了随后对应力集中器的高周疲劳行为的工作，包括尺寸效应，复杂的三维形状和焊接接头。一些历史悠久的临界方法是在骨折力学的帮助下提出的，并且认为临界距离方法能够产生能够预测裂缝和凹口的行为的理论模型，从而更普遍适用而不是瑞士。

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