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首页> 外文期刊>Theoretical and Applied Fracture Mechanics >An original simplified method based on the use of an adjustable localization operator for low-cycle fatigue life predictions in the case of confined plasticity
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An original simplified method based on the use of an adjustable localization operator for low-cycle fatigue life predictions in the case of confined plasticity

机译：基于使用可调节定位运算符进行狭窄可塑性的低周期疲劳寿命预测的原始简化方法

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摘要

This study aims to propose a methodology to rapidly obtain low-cycle fatigue life predictions. The main idea is to use a recently developed simplified method to estimate the stabilized stress-strain curve in confined plasticity in order to apply a fatigue criterion. This original simplified method is based on the use of an adjustable scale transition rule which has been demonstrated to be more robust to multiaxial loadings than classic plasticity correction rules. Different procedures are used to calibrate the localization operator and are compared to each other. The whole method is validated on a double notched specimen subjected either to compressive or tensile repeated loading. Kinematics and isotropic hardenings with threshold are used to model the partial mean stress relaxation that is observed experimentally. A modification of the Morrow fatigue criterion is proposed to enhance the prediction of the influence of the load ratio, represented by the local stabilized mean stress. The full design chain validation on notched specimens has shown a constant conservatism on the fatigue life predictions whatever the nominal load ratio and level. The results obtained with the simplified method are very similar to those obtained with finite elements.
机译：本研究旨在提出一种迅速获得低循环疲劳寿命预测的方法。主要思想是使用最近开发的简化方法来估计限制可塑性的稳定应力 - 应变曲线，以施加疲劳标准。这种原始简化的方法基于使用可调刻度转换规则，这些转换规则已经被证明比经典塑性校正规则更强大地对多轴加载。使用不同的程序来校准定位操作员并彼此比较。在经受压缩或拉伸重复载荷的双缺口样本上验证整个方法。具有阈值的运动学和各向同性硬化用于模拟实验观察到的部分平均应力松弛。提出了明天疲劳标准的修改，以增强由局部稳定平均应力表示的负荷比的影响。无论标称载荷比和水平如何，缺口样本上的全部设计链验证已经对疲劳寿命预测的恒定保守主义。用简化方法获得的结果与用有限元获得的结果非常相似。

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