| 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。 |
| 关键词: 不锈钢板翅结构 钎焊残余应力 蠕变松弛 有限元 |
| DOI： |
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| 基金项目:国家自然科学基金资助项目(10472043);江苏省自然科学基金预研资助项目(BK2004214);江苏省"六大人才高峰"基金资助项目(06-D-035) |
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| 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 Wenchun1, GONG Jianming1, CHEN Hu1, TU Shangdong1,2
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1.School of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China;2.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. |
| Key words: stainless steel plate-fin structure brazing residual stress creep relaxation finite element analysis |
