不同裂纹位置焊接接头J积分有限元数值分析
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摘要
针对焊接接头中母材、焊缝、热影响区的性能各不相同的问题,利用有限元方法,建立了焊接接头有限元计算模型,编写了J积分有限元计算程序。计算结果表明,在平面应变和平面应力两种状态下,焊接接头三个不同裂纹位置的J积分值与全母材和全焊缝材料的J积分值均不相同,但具有一定的规律性;裂纹分别处于焊接接头不同位置时的J积分有限元计算结果也不相同。根据各种情况下的有限元计算结果,结合焊接结构安全评定的工程实际提出了指导意见和建议。
In considering the mechanically different problems of all base metal, all weld metal and hot-effect zone properties in welded joints, the finite element method is used to establish the finite element calculation model for welded joints and to prepare the finite element calculation program for J-integration in this paper. The calculation results indicate that under the two states of plane strain and plan stress, the J-integral values at three different locations of welded joints are different from those of all base material and all weld material. But there is a certain law. In addition, the J-integral finite element calculation results of cracks at the same welded joint in different locations are not the same. Both in combining the two finite element calculation results in different cases and in considering the engineering real conditions of safety assessment of welded structures, this paper suggests some concrete guiding suggestions and recommendations.
In considering the mechanically different problems of all base metal, all weld metal and hot-effect zone properties in welded joints, the finite element method is used to establish the finite element calculation model for welded joints and to prepare the finite element calculation program for J-integration in this paper. The calculation results indicate that under the two states of plane strain and plan stress, the J-integral values at three different locations of welded joints are different from those of all base material and all weld material. But there is a certain law. In addition, the J-integral finite element calculation results of cracks at the same welded joint in different locations are not the same. Both in combining the two finite element calculation results in different cases and in considering the engineering real conditions of safety assessment of welded structures, this paper suggests some concrete guiding suggestions and recommendations.
引文
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[2]ZhangJian-xun,ShiYao-wu,TuMing-jin.Factorsaffectingtheestimationofthefracturemechanicsparametersofcenter-crackedweldment[J].EngineeringFractureMechanics,1995,50(4):537～543.
[3]康继东,张玉凤,霍立兴.关于非均质焊接接头中的J积分断裂判据[J].固体力学学报,2000(1):61～65.
[4]张敏.带缺陷焊接结构完整性评价的工程方法研究[D].西安:西安交通大学材料科学与工程学院,1997.
[5]左藤邦彦,向井喜彦,丰田政男.焊接接头的力学性能[M].张伟昌译.北京:机械工业出版社,1983.
[6]贺定勇,田富强,李晓延,等.用弹塑性有限元法对焊接接头裂尖场J积分的研究[J].机械强度,2001,23(2):235～238.
[7]张铜生,张富德.简明有限元法及其应用[M].北京:地震出版社,1990.
[8]杜平安.有限元网格划分的基本原则[J].机械设计与制造,2000(1):34～36.
[9]王祖城,汪家才.弹性和塑性理论及有限单元法[M].北京:冶金工业出版社,1983.
[10]李国琛,耶纳M.塑性大应变微结构力学[M].北京:科学出版社,1993.
[11]刘卫国.Fortain90程序设计教程[M].北京:北京邮电出版社,2003.
[12]张敏,马博,许德胜,等.含裂纹体焊接接头J-Q断裂准则的工程化方法[J].西安理工大学学报,2004,20(1):15～20.
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