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Application of a New Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description

机译:基于能量的新型ΔS*裂纹驱动力在疲劳裂纹扩展速率上的应用

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摘要

This paper presents the problem of the description of fatigue cracking development in metallic constructional materials. Fatigue crack growth models (mostly empirical) are usually constructed using a stress intensity factor ΔK in linear-elastic fracture mechanics. Contrary to the kinetic fatigue fracture diagrams (KFFDs) based on stress intensity factor K, new energy KFFDs show no sensitivity to mean stress effect expressed by the stress ratio R. However, in the literature there is a lack of analytical description and interpretation of this parameter in order to promote this approach in engineering practice. Therefore, based on a dimensional analysis approach, ΔH is replaced by elastic-plastic fracture mechanics parameter—the ΔJ-integral range. In this case, the invariance from stress is not clear. Hence, the main goal of this paper is the application of the new averaged (geometrically) strain energy density parameter ΔS* based on the relationship of the maximal value of J integral and its range ΔJ. The usefulness and invariance of this parameter have been confirmed for three different metallic materials, 10HNAP, 18G2A, and 19th century puddle iron from the Eiffel bridge.
机译:本文提出了描述金属建筑材料疲劳裂纹发展的问题。疲劳裂纹扩展模型(主要是经验性的)通常是在线性弹性断裂力学中使用应力强度因子ΔK构造的。与基于应力强度因子K的动态疲劳断裂图(KFFDs)相反,新能量KFFDs对由应力比R表示的平均应力作用不敏感。但是,在文献中缺乏对此的分析描述和解释参数以在工程实践中推广这种方法。因此,基于尺寸分析方法,将ΔH替换为弹塑性断裂力学参数-ΔJ积分范围。在这种情况下,应力的不变性尚不清楚。因此,本文的主要目标是基于J积分最大值与其范围ΔJ的关系,应用新的平均(几何上)的应变能密度参数ΔS*。对于来自埃菲尔铁桥的三种不同的金属材料,10HNAP,18G2A和19世纪的水坑铁,已经确认了该参数的有用性和不变性。

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