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金属学报  2019, Vol. 55 Issue (8): 1058-1066    DOI: 10.11900/0412.1961.2018.00567
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尺寸因素对2D轴对称模型计算不锈钢管焊接残余应力精度的影响
戴培元,胡兴,逯世杰,王义峰(),邓德安
重庆大学材料科学与工程学院 重庆 400045
Influence of Size Factor on Calculation Accuracy of Welding Residual Stress of Stainless Steel Pipe by 2D Axisymmetric Model
Peiyuan DAI,Xing HU,Shijie LU,Yifeng WANG(),Dean DENG
College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
全文: PDF(7704 KB)   HTML
摘要: 

采用数值模拟和实验相结合的方法研究了尺寸因素对2D轴对称模型计算SUS316不锈钢管焊接残余应力精度的影响。基于通用有限元软件MSC. Marc,分别采用2D轴对称模型和3D模型计算了不同尺寸圆管对接接头的温度场和焊接残余应力分布,并将小尺寸管残余应力计算结果与实验测量结果进行了比较。结果表明,2D轴对称模型与3D模型计算结果整体吻合较好,但在靠近内表面的焊缝及近焊缝区域,焊接残余应力的幅值和拉压应力区域的大小存在一定差别,且差别随圆管尺寸的增加而增大。对于实际的工程应用,在不考虑始终端应力问题时,可以用2D轴对称模型代替3D模型计算环焊缝稳定区残余应力,从而节省大量计算时间。

关键词 残余应力数值模拟二维模型管道焊接    
Abstract

Austenitic stainless steel, owing to its good mechanical properties and excellent corrosion resistance, is widely used in petroleum, chemical, nuclear power and other fields. Welding is an extremely important manufacturing method in industrial production. When the thermal elastic-plastic finite element method (TEP-FEM) is used to simulate welding residual stress, especially in thick welded joints, a long calculation time is generally needed. Therefore, it has become an urgent problem to develop an efficient and high-precision computational approach to simulate welding residual stress. In this work, numerical simulation and experimental methods were combined to explore the effect of size on the calculation precision of welding residual stress of SUS316 stainless steel by the 2D axisymmetric model, in order to clarify the applicability of 2D axisymmetric model in the prediction of welding residual stress in pipe butt joints. This research can provide theoretical support for the development of computational methods suitable for engineering applications. Based on the finite element software MSC. Marc, the temperature field and welding residual stress distribution of three different sizes of pipes were calculated by 2D axisymmetric model and 3D model. The calculated residual stress distributions in the thin pipe model are compared with the experimental measurements. The results show that calculated residual stress by the 2D axisymmetric model agrees well with the 3D model. However, in the weld seam near the inner surface and the areas near the weld seam, a deviation on the residual stress distribution between in the 2D axisymmetric model and in the 3D model was observed, which is significant as the pipe size increases. For practical engineering applications, with the regardless of the stress problems at the beginning and end positions, the 2D axisymmetric model can be used instead of the 3D model to calculate the residual stress of the girth weld, which is very beneficial to calculation time saving.

Key wordsresidual stress    numerical simulation    2D model    pipe welding
收稿日期: 2018-12-27     
ZTFLH:  TG404  
基金资助:国家自然科学基金项目((No.51875063));中央高校基本科研业务费项目((No.2018CDXYCL0018));以及重庆市研究生科研创新项目((No.CYB18003))
通讯作者: 王义峰     E-mail: wangyf0902@cqu.edu.cn
Corresponding author: Yifeng WANG     E-mail: wangyf0902@cqu.edu.cn
作者简介: 戴培元,男,1995年生,硕士生

引用本文:

戴培元,胡兴,逯世杰,王义峰,邓德安. 尺寸因素对2D轴对称模型计算不锈钢管焊接残余应力精度的影响[J]. 金属学报, 2019, 55(8): 1058-1066.
Peiyuan DAI, Xing HU, Shijie LU, Yifeng WANG, Dean DENG. Influence of Size Factor on Calculation Accuracy of Welding Residual Stress of Stainless Steel Pipe by 2D Axisymmetric Model. Acta Metall Sin, 2019, 55(8): 1058-1066.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00567      或      https://www.ams.org.cn/CN/Y2019/V55/I8/1058

图1  坡口尺寸和焊道布置示意图
图2  残余应力测量位置和焊接方向示意图
图3  3种不同尺寸圆管的2D和3D有限元模型
CaseModeld / mmt / mmd/tM
A3D114.38.613.342200
B2D422
C3D348.526.213.3139200
D2D870
E3D665.050.013.3226240
F2D808
表1  3种不同尺寸圆管的2D和3D有限元计算案例
图4  材料热物理性能参数和力学性能参数
图5  不同尺寸圆管最后一道焊的热循环曲线
图6  内表面和外表面轴向残余应力的模拟结果与测量值[19]对比
图7  内表面和外表面周向残余应力模拟结果与测量值[19]对比
图8  3D模型180°截面和2D轴对称模型的周向残余应力分布对比
图9  3D模型180°截面和2D轴对称模型的轴向残余应力分布对比
图10  周向和轴向残余应力沿焊缝中心线的分布对比
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