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首页> 外文会议>Symposium on Mechanisms and Mechanics of Fracture: the John Knott Symposium, Oct 7-10, 2002, Columbus, Ohio, USA >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：我仍在努力的约翰的理想

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摘要

Sittng 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 low 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：约翰·诺特（John Knott）于1982年在剑桥的The Eagle酒馆中向我提出了一个关于期末项目的想法。通过对先前通过施加高载荷而钝化的裂纹进行疲劳测试，我们可以研究从裂纹状到缺口状行为的转变。该项目进展顺利，但未解决的问题很少，二十年后，我仍在努力。本文总结了应力集中器高周疲劳行为的后续工作，包括尺寸效应，复杂的三维形状和焊接接头。一些古老的临界距离方法是在断裂力学的帮助下发展起来的，有人认为，临界距离方法会产生一种理论模型，该模型能够预测裂纹和缺口的行为，因此更普遍地适用。比LEFM。

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