首页> 外文会议>ASME international pipeline conference 2008 >DIRECT STRAIN CALCULATION OF PIPE LINE DENT FROM KNOT MIGRATION USING A KINEMATIC MODEL FREE OF MATERIAL PROPERTIES
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DIRECT STRAIN CALCULATION OF PIPE LINE DENT FROM KNOT MIGRATION USING A KINEMATIC MODEL FREE OF MATERIAL PROPERTIES

机译:使用没有材料特性的运动学模型直接计算结点迁移引起的管线应力

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摘要

With advances in interpolation and noise filtering, a pure strain calculation can be derived using the fundamental definition of the strain tensor and a shell model with only a few assumptions. Deformation data acquired on the inner surface of the pipe is used to calculate the positional knots that define the inner shell sutface from which the displacement vectors of the median plane can be calculated. Using a shell model around the median plane, the strains can be calculated on the inner and outer surfaces based purely on the displacement of the knot positions. To validate this procedure, an FEM is built using a nonlinear stress-strain response for the steel to model its elasto-plastic behavior with associated kinematic hardening behavior. The model uses a second order shell element with plasticity, large deformation, and large strain capabilities.
机译:随着插值和噪声滤波的进步,仅需少量假设即可使用应变张量的基本定义和壳模型来推导纯应变计算。在管道内表面上获取的变形数据用于计算定义内壳表面的位置节,可从中计算出中间平面的位移矢量。使用围绕中间平面的壳模型,可以仅基于结位置的位移来计算内表面和外表面上的应变。为了验证该程序,使用非线性应力-应变响应建立了钢的FEM,以模拟其弹塑性行为以及相关的运动硬化行为。该模型使用具有可塑性,大变形和大应变能力的二阶壳单元。

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