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首页> 外文期刊>Finite elements in analysis & design >Numerical implementation of bounding-surface model for simulating cyclic inelastic response of metal piping components
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Numerical implementation of bounding-surface model for simulating cyclic inelastic response of metal piping components

机译：模拟金属管道部件循环非弹性响应的边界表面模型的数值实现

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摘要

The present paper describes the numerical implementation of the bounding-surface cyclic-plasticity model in a finite element environment, suitable for simulating the structural behavior of metal components subjected to strong cyclic loading. The model is based on the Dafalias-Popov "bounding surface" concept, equipped with appropriate enhancements that allow for simulation of repeated, alternate inelastic deformation. The numerical implementation is performed using an elastic-predictor/plastic-corrector method. Special features of the model are examined, focusing on the influence of several material parameters on cyclic material response. The model is also employed for simulating laboratory physical experiments. First, stress-controlled and strain-controlled experiments are simulated, in strip specimens made of regular (mild) steel and high-strength steel. Upon appropriate calibration from these material tests, the model is employed in a finite element model for predicting the mechanical response of a large-scale physical experiment on a steel pipe elbow. The very good comparison between the experimental and the numerical results demonstrates the suitability of the numerical model for large-scale structural computations and its capability of predicting the mechanical response of structural metal components under severe repeated loading, with emphasis on the simulation of ratcheting.
机译：本文介绍了有限元环境中边界表面循环塑性模型的数值实现，适用于模拟经受强循环载荷的金属部件的结构行为。该模型基于Dafalias-Popov“边界表面”概念，配备了适当的增强功能，其允许模拟重复，替代的非弹性变形。使用弹性预测器/塑料校正器方法进行数值实现。检查模型的特殊功能，专注于几种材料参数对循环材料响应的影响。该模型也用于模拟实验室物理实验。首先，在具有规则（温和）钢和高强度钢制成的条带标本中，模拟了应力控制和应变控制的实验。在从这些材料测试的适当校准时，该模型用于有限元模型，用于预测钢管弯头的大规模物理实验的机械响应。实验和数值结果之间的非常好的比较表明了数值模型对大规模结构计算的适用性及其预测严重重复负载下结构金属部件的机械响应的能力，重点是棘轮的模拟。

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