A low-cycle fatigue (LCF) analysis is one of the main design stages for highly loaded structural elements used in various applications. For this analysis, it is necessary to determine the values of local stresses and deformations, taking into account both elastic and plastic regions in the zones of stress concentration. This study presents and assesses the engineering methods used for prediction of low-cycle fatigue in structural elements. For zones of stress (strain) concentration, the Neuber-Makhutov method for LCF, taking into account the type of material stress-strain diagrams, is employed. The concept of distributed damage, based on the main ideas of the continuum damage mechanics of Kachanov-Rabotnov, was used. An approach employing the damage parameter for assessment of damage accumulation in LCF in highly loaded areas of structural elements is presented.

中文翻译：

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损伤参数在低周疲劳评估中的作用


低周疲劳 (LCF) 分析是各种应用中使用的高负载结构元件的主要设计阶段之一。对于此分析，必须确定局部应力和变形的值，同时考虑应力集中区域中的弹性区域和塑性区域。本研究提出并评估了用于预测结构元件低周疲劳的工程方法。对于应力（应变）集中区域，考虑材料应力-应变图的类型，采用 LCF 的 Neuber-Makhutov 方法。采用基于 Kachanov-Rabotnov 连续介质损伤力学主要思想的分布式损伤概念。提出了一种采用损伤参数来评估结构元件高负载区域 LCF 损伤累积的方法。