| 不锈钢板翅结构钎焊残余应力及其高温蠕变松弛行为三维有限元分析 |
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| 引用本文： | 蒋文春,巩建鸣,陈虎,涂善东.不锈钢板翅结构钎焊残余应力及其高温蠕变松弛行为三维有限元分析[J].焊接学报,2007,28(7):17-20. |
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| 作者姓名： | 蒋文春 巩建鸣 陈虎 涂善东 |
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| 作者单位： | 1. 南京工业大学,机械与动力工程学院,南京,210009
2. 南京工业大学,机械与动力工程学院,南京,210009;华东理工大学,机械与动力工程学院,上海,200237 |
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| 基金项目： | 国家自然科学基金
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江苏省自然科学基金
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江苏省六大人才高峰基金 |
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| 摘 要： | 利用有限元软件ABAQUS,对不锈钢板翅结构在钎焊过程中产生的残余应力及其高温下的蠕变松弛行为进行三维有限元分析,得到了残余应力的变化规律.结果表明,由于镍基钎料BNi-2和不锈钢母材304力学性能的差异以及夹具的约束作用,钎焊后在接头处产生了较大的残余应力.在高温环境下,由于蠕变松弛,残余应力大幅度下降.在蠕变稳态阶段,钎缝处仍然存在一定的残余应力;钎角处蠕变应力和应变集中,易萌生裂纹,成为最薄弱环节.研究结果为板翅结构的高温强度设计提供参考.
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| 关 键 词： | 不锈钢板翅结构 钎焊残余应力 蠕变松弛 有限元 |
| 文章编号： | 0253-360X（2007）07-017-04 |
| 收稿时间： | 2006/11/3 0:00:00 |
| 修稿时间： | 2006-11-03 |
3-D finite element analysis of residual stress and its creep relaxation at high temperature for stainless steel brazed plate-fin structure |
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| JIANG Wenchun,GONG Jianming,CHEN Hu and TU Shangdong.3-D finite element analysis of residual stress and its creep relaxation at high temperature for stainless steel brazed plate-fin structure[J].Transactions of The China Welding Institution,2007,28(7):17-20. |
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| Authors: | JIANG Wenchun GONG Jianming CHEN Hu and TU Shangdong |
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| Affiliation: | School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China,School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, 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;School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | The residual stress generated in brazed process and its creep relaxation behavior for stainless steel plate-fin structure at high temperature were analyzed by finite element code-ABAQUS. The results show that larger residual stress was generated in brazed joint due to the mismatch mechanical properties between brazing filler metal and base metal and the constraint of clamping fixture. At high temperature region, the residual stress was greatly decreased due to the creep relaxation behavior. The creep stress and strain are concentrated in the fillet zone, where the crack may initiate and propagate along the brazing seam. |
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| Keywords: | stainless steel plate-fin structure brazing residual stress creep relaxation finite element analysis |
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