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首页> 外文期刊>Corrosion Engineering, Science and Technology >Fatigue damage accumulation: the role of corrosion on the early stages of crack development
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Fatigue damage accumulation: the role of corrosion on the early stages of crack development

机译：疲劳损伤累积：腐蚀对裂纹发展早期的作用

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摘要

It is now recognised that a complex load history may lead to structural damage that cannot be predicted on the basis of simple uniaxial loading conditions. The application of a single overload can induce sufficient crack growth such that the fatigue limit of a material is compromised. In a similar manner, it is possible to transgress the fatigue limit of a material by applying a number of corrosion cycles which lead to an increase in the size of the defect(s) present in the material beyond that of a 'threshold condition'. Damage accumulation within materials arises owing to the load and environmental history experienced throughout the lifetime of a component or structure. Furthermore, damage owing to load or environment in isolation impacts less on the durability of a structure/component, compared with that when conjoint effects of load and environment are experienced. This paper discusses the contribution that arises from environmental processes, such as corrosion, to final material failure. Synergy owing to corrosion and static/cyclic stress are discussed for both passive (stainless steel) and active (carbon steel) materials.
机译：现在已经认识到，复杂的载荷历史可能会导致无法根据简单的单轴载荷条件来预测的结构破坏。单个过载的施加会引起足够的裂纹扩展，从而损害材料的疲劳极限。以类似的方式，可以通过施加多个腐蚀循环来越过材料的疲劳极限，所述腐蚀循环导致材料中存在的缺陷的尺寸增加到超过“阈值条件”的范围。由于在组件或结构的整个生命周期中经历的负载和环境历史，材料内部会产生损坏累积。此外，与在经历负载和环境的联合影响时相比，孤立地由负载或环境引起的损坏对结构/部件的耐久性的影响较小。本文讨论了环境过程（例如腐蚀）对最终材料故障的影响。讨论了由于钝化（不锈钢）和活性（碳钢）材料的腐蚀和静态/循环应力而产生的协同作用。

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