| 裂解炉管焊接残余应力场中裂纹扩展行为的数值分析 |
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| 引用本文： | 祝金丹,张礼敬,巩建鸣.裂解炉管焊接残余应力场中裂纹扩展行为的数值分析[J].焊接学报,2008,29(5):101-104,108. |
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| 作者姓名： | 祝金丹 张礼敬 巩建鸣 |
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| 作者单位： | 1. 南京化工职业技术学院,机械系,南京,210048
2. 南京工业大学,机械与动力工程学院,南京,210009 |
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| 摘 要： | 针对裂解炉管对接焊接热影响区中常见的环向与斜裂纹在焊接残余应力的作用下的扩展行为进行数值预测.采用基于VNA算法的有限单元交互法(FEAM),结合有限元方法研究焊接残余拉应力对炉管裂纹扩展的影响,通过研究裂纹尖端区域的应力强度因子的变化来判断裂纹的准静态扩展倾向.结果表明,在多道焊焊接残余应力的影响下,在炉管焊缝热影响区内表面的环向裂纹有沿环向变长的倾向,而斜裂纹则同时有变长、变深的倾向.
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| 关 键 词： | 裂解炉管 残余应力 有限单元交互法 有限元方法 裂纹扩展 |
| 文章编号： | 0253-360X(2008)05-0101-05 |
| 收稿时间： | 2007/7/11 0:00:00 |
| 修稿时间： | 2007年7月11日 |
Numerical simutation on cracking growth behavior under effect of residual stresses in welding of pyrolysis tube |
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| ZHU Jindan,ZHANG Lijing and GONG Jianming.Numerical simutation on cracking growth behavior under effect of residual stresses in welding of pyrolysis tube[J].Transactions of The China Welding Institution,2008,29(5):101-104,108. |
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| Authors: | ZHU Jindan ZHANG Lijing and GONG Jianming |
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| Affiliation: | Mechanical Technology Department, Nanjing College of Chemical Technology, Nanjing 210048, China,School of Mechanical and Power engineering, Nanjing University of Technology, Nanjing 210009, China and School of Mechanical and Power engineering, Nanjing University of Technology, Nanjing 210009, China |
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| Abstract: | This present focuses on the numerical prediction about the cracking growth behavior of circumferential and inclined cracks generally observed in the region of heat-affected zone on the effect of residual stresses of butt-welding of pyrolysis tube.Finite element alternating method (FEAM)based on VNA algorithm combining with finite element modeling was utilized to investigate the effect of residual stress on cracking and predict the cracking growth tendency according to the variation of stress intensity factors along the crack edge.The results show that under the effect of welding residual stresses, the circumferential cracks may tend to circumferentially lengthen along the major axis of crack, and both lengthening along major axis and being deep along minor axis of inclined crack may occur. |
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| Keywords: | pyrolysis tube residual stress FEAM FEM cracking growth |
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