The effect of plasticity on residual stress generation and redistribution in offshore pipelines
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The effect of plasticity on residual stress generation and redistribution in offshore pipelines

机译：可塑性对海上管道残余应力产生和再分配的影响

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AbstractThe effect of plasticity induced by bending-reverse bending-straightening on residual stress generation and redistribution in pipes is examined through an analytical model, Finite Element Analysis and experimental measurements. The analytical model is based on elastic-perfectly plastic material properties, and correlates with Finite Element Analysis results, based on both elastic-perfectly plastic and Ramberg-Osgood strain-hardening material models. Comparison with experimental measurements at the pipe's crown position, furthest from the bending neutral axis, shows a similar through-thickness trend between the three methods. The proposed analytical model has enabled simplified, closed-form equations for predicting the through-thickness residual stress profile in pipes after one cycle of the bending-reverse bending-straightening process. In addition, parametric analyses using the extended analytical model with due consideration for initial residual stresses has produced practical recommendations for estimating the maximum residual stress magnitude at the pipe's crown position and around the pipe's circumference for a range of pipe sizes (outer diameter between 8in and 16in).]]>
机译：<！[CDATA [ 抽象 通过弯曲反向弯曲矫正对残余应力产生和管道再分配引起的塑性效果分析模型，有限元分析和实验测量。分析模型基于弹性 - 完美的塑料材料特性，并基于弹性完美的塑料和ramberg-Osgood应变硬化材料模型来与有限元分析结果相关。与管道冠位置处的实验测量比较，从弯曲中性轴线最远，显示了三种方法之间的相似的贯穿厚度趋势。所提出的分析模型已经启用了简化的闭合形式方程，用于在弯曲反向弯曲矫直工艺的一个循环之后预测管道中的通孔残余应力曲线。另外，使用扩展分析模型具有适当考虑的初始残余应力的参数分析产生了用于估计管道冠位置的最大残余应力幅度以及管道围绕一系列管道尺寸（外径在8英寸之间的外径之间的最大残余应力幅度的实用建议16in）。 ]]>

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