高周疲劳寿命预测的概率细观力学

R. Tryon, T. Cruse
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引用次数: 15

摘要

本文提出了一种描述和理解燃气轮机合金高循环疲劳寿命的解析建模方法。人们认识到,结构的疲劳设计不能基于材料的平均性能,而必须考虑- 3σ或其他一些适当的极值(分布的尾部)载荷和/或材料性能。因此,在设计应用中有用的寿命预测能力必须解决材料对疲劳载荷响应中固有的散射。此外,寿命预测能力应识别在材料耐久性分布散点尾部起关键作用的关键微力学变量。所提出的方法通过研究导致散射的微观结构变量,并开发分析和半分析模型来定量地将变量与响应联系起来,从而解决疲劳中的散射问题。该模型具有通用性,考虑了损伤累积序列的全范围;从最初无缺陷组织的裂纹形核到最终的快速断裂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Probabilistic Mesomechanics for High Cycle Fatigue Life Prediction
This paper presents an analytical modeling approach to characterize and understand high cycle fatigue life in gas turbine alloys. It is recognized that the design of structures subjected to fatigue cannot be based on average material behavior but that designs must consider −3σ or some other appropriate extreme value (tail of the distribution) loading and/or material properties. Thus, a life prediction capability useful in a design application must address the scatter inherent in material response to fatigue loading. Further, the life prediction capability should identify the key micromechanical variables that are critical in the tail of the scatter in the materials durability distribution. The proposed method addresses the scatter in fatigue by investigating the microstructural variables responsible for the scatter and developing analytical and semi-analytical models to quantitatively relate the variables to the response. The model is general and considers the entire range of damage accumulation sequences; from crack nucleation of the initially unflawed structure to final fast fracture.
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