中子衍射和有限元法研究不锈钢复合板补焊残余应力

金属学报, 2012, 48(12): 1525-1529. doi: 10.3724/SP.J.1037.2012.00341

中子衍射和有限元法研究不锈钢复合板补焊残余应力

蒋文春 ^1, , WOO Wanchuck ^2, , 王炳英 ^3, , 涂善东 ^4,

1.中国石油大学(华东)化学工程学院重质油国家重点实验室,青岛266580; Korea Atomic Energy Research Institute, Daejeon, 305-353, South Korea

2.Korea Atomic Energy Research Institute, Daejeon, 305-353, South Korea

3.中国石油大学(华东)机电工程学院,青岛,266580

4.华东理工大学机械与动力工程学院承压系统安全科学教育部重点实验室,上海,200237

基金项目: 国家自然科学基金项目51105380,教育部博士点新教师基金项目20100133120008和山东省自然科学基金项目ZR2010AQ002资助

关键词：不锈钢复合板 , 补焊 , 残余应力 , 中子衍射 , 有限元

A STUDY OF RESIDUAL STRESS IN THE REPAIR WELD OF STAINLESS STEEL CLAD PLATE BY NEUTRON DIFFRACTION MEASUREMENT AND FINITE ELEMENT METHOD

利用中子衍射和有限元法分析不锈钢复合板补焊残余应力,结果表明:计算结果与测试结果具有一致性.焊缝和热影响区产生了较高的残余应力,远离热影响区,残余应力逐渐降低.由于局部补焊加热,沿厚度方向产生了弯曲应力；在不锈钢覆层,最大残余应力位于热影响区,由于加工硬化的影响,其值已超过屈服强度.因此,采用常规标准假设会使评定结果与实际存在差异,利用中子衍射与有限元法相结合,不仅可以准确获得残余应力大小,而且可以获得沿厚度方向分布的残余应力,满足安全评定标准有关处理焊接残余应力的要求.

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