Large-Scale Analysis and Local Stress Assessment of Flexible Unbonded Pipes Using FEA
Large-Scale Analysis and Local Stress Assessment of Flexible Unbonded Pipes Using FEA
复制标题
使用 FEA 对柔性无粘结管道进行大规模分析和局部应力评估
DOI：
10.1115/omae2012-84249
复制
发表时间：
2012
影响因子：
7.2
通讯作者：
H. Bahai
中科院分区：
文献类型：
--
作者：
B. Edmans;G. Alfano;H. Bahai
柔性管道的寿命评估涉及疲劳参数的评估，需要准确预测管道组件中的应力及其变化。为了预测复杂的三维非线性动力学对构件应力历史的影响，多尺度方法可以将应用的通用性与计算效率联合收割机结合起来。在本文中，我们描述了一个双尺度计算均匀化程序的发展，连接一个粗尺度的分析模型，使用专门的梁元素，和一个详细的应力预测模型组成的管段与组件建模与壳元素和摩擦接触interactions.To使用该程序，详细的模型首先作为一个虚拟的测试台，通过它可以确定的参数的全球模型。对于详细的应力预测，在感兴趣的操作条件下测试全局模型，提供一组应用于详细模型的广义应变。这些模型在通用有限元软件包Abaqus中实现。作为该过程的关键方面，我们展示了如何在不引入虚假边界效应的情况下将广义应力和应变均匀地施加到详细模型上，并演示了如何使用全局模型的应变数据确定局部应力。Copyright © 2012 by ASME
Lifespan assessment of flexible risers involves the evaluation of fatigue parameters, requiring accurate predictions of stresses and their variation in pipe components. For predicting the effect of complex three-dimensional nonlinear dynamics on component stress histories, multi-scale methods can combine generality of application with computational efficiency. In this paper, we describe the development of a two-scale computational homogenisation procedure linking a coarse-scale analysis model using specialised beam elements, and a detailed stress prediction model consisting of a pipe section with components modelled with shell elements and frictional contact interactions.To use the procedure, the detailed model first functions as a virtual test rig, by which parameters of the global model may be determined. For detailed stress prediction, the global model is tested under the operating conditions of interest providing a set of generalised strains which are applied to the detailed model. The models are implemented in the general-purpose finite-element package Abaqus. As key aspects of the procedure, we show how generalised stresses and strains can be imposed on the detailed model uniformly without introducing spurious boundary effects and demonstrate how local stresses can be determined using strain data from the global model.Copyright © 2012 by ASME