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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference: Residual Stress, Fitness - for - Service and Manufacturing Processes; 20030720-20030724; Cleveland,OH; US >VERIFICATION OF A FINITE ELEMENT ANALYSIS PROCEDURE FOR MODELING THE NONLINEAR, MONOTONIC IN-PLANE BEHAVIOR OF 4 INCH, SCHEDULE 10, STAINLESS STEEL, 90° ELBOWS
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VERIFICATION OF A FINITE ELEMENT ANALYSIS PROCEDURE FOR MODELING THE NONLINEAR, MONOTONIC IN-PLANE BEHAVIOR OF 4 INCH, SCHEDULE 10, STAINLESS STEEL, 90° ELBOWS

机译：有限元分析程序的验证，用于模拟4英寸，10时间表，不锈钢，90°弯头的非线性单调平面内行为

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摘要

A project has been conducted to verify a finite element analysis procedure for studying the nonlinear behavior of 90°, stainless steel, 4 inch schedule 10, butt welding elbows. Two displacement controlled monotonic in-plane tests were conducted, one closing and one opening, and the loads, displacements, and strains at several locations were recorded. Stacked 90° tee rosette gages were used in both tests because of their ability to measure strain over a small area. ANSYS shell element 181 was used in the FEA reconciliations. The FEA models incorporated detailed geometric measurements of the specimens, including the welds, and material stress-strain data obtained from the attached straight piping. Initially, a mesh consisting of sixteen elements arrayed in 8 rings was used to analyze the elbow. The load-displacement correlation was quite good using this mesh, but the strain reconciliation was not. Analysis of the FEA results indicated that the axial and hoop strain gradients across the mid-section of the elbow were very high. In order to generate better strain correlations, the elbow mesh was refined in the mid-section of the elbow to include 48 elements per ring and an additional six rings, effectively increasing the element density by nine times. Using the refined mesh produced much better correlations with the strain data.
机译：已经进行了一个项目来验证有限元分析程序，以研究90°，不锈钢，4英寸规程10，对接弯头的非线性行为。进行了两次位移控制的单调面内测试，一次关闭和一次打开，并记录了多个位置的载荷，位移和应变。两种测试均使用堆叠式90°T型玫瑰花规，因为它们能够测量小面积的应变。在FEA对帐中使用了ANSYS外壳元素181。 FEA模型结合了样品的详细几何测量，包括焊缝，以及从连接的直管获得的材料应力-应变数据。最初，使用由16个元素组成的网格（排列成8个环）来分析弯头。使用该网格时，载荷-位移相关性非常好，但应变协调则不然。对有限元分析结果的分析表明，肘部中段的轴向和环向应变梯度非常高。为了产生更好的应变相关性，在肘部的中部对肘部网格进行了精炼，使其每个环包括48个元素，并另外增加了六个环，从而将元素密度有效地增加了9倍。使用精制的网格可以产生与应变数据更好的相关性。

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