成形系数及强度组配对焊缝区裂尖力学特性的影响
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摘要
为了解镍基合金焊接接头焊缝成形系数及强度组配对裂纹尖端力学特性的影响,借助有限元数值模拟手段,分析了焊缝成形系数及不同组配条件下裂纹尖端力学特性。低组配下,裂尖Mises应力、等效塑性应变及J积分均随着成形系数的增大而增大;等组配下,裂尖力学特性不变;高组配下,裂尖Mises应力、等效塑性应变及J积分均随着成形系数的增大而减小。随着组配比的增加,裂尖Mises应力随之增加,裂尖等效塑性应变和J积分逐渐减小。研究结果表明,强度组配对裂尖力学特性有较大的影响,焊缝成形系数对裂尖力学特性影响较小。
To understand the effect of form factor and strength matching on mechanical properties of the crack tip in weld zone for Nickel-based alloys,systematic analysis was conducted by finite element numerical simulation.In low strength matching,the Mises stress,equivalent plastic strain and j-integral of the crack tip all increase with the form factor of the weld.With the same strength matching,the mechanical properties of the crack tip are not changed.In high strength matching,the Mises stress,equivalent plastic strain and j-integral of the crack tip decrease with the form factor of the weld.With the increase of the strength matching ratio,the Mises stress of the crack tip increases,while the equivalent plastic strain and the j-integral decrease gradually.Results show that the strength matching has larger effects on the mechanical properties of the crack tip than the form factor of the weld.
To understand the effect of form factor and strength matching on mechanical properties of the crack tip in weld zone for Nickel-based alloys,systematic analysis was conducted by finite element numerical simulation.In low strength matching,the Mises stress,equivalent plastic strain and j-integral of the crack tip all increase with the form factor of the weld.With the same strength matching,the mechanical properties of the crack tip are not changed.In high strength matching,the Mises stress,equivalent plastic strain and j-integral of the crack tip decrease with the form factor of the weld.With the increase of the strength matching ratio,the Mises stress of the crack tip increases,while the equivalent plastic strain and the j-integral decrease gradually.Results show that the strength matching has larger effects on the mechanical properties of the crack tip than the form factor of the weld.
引文
[1]赵凌燕.核电焊接接头裂尖力学特征及环境致裂裂纹扩展速率研究[D].西安:西安科技大学,2014.ZHAO Lingyan.Research on local mechanical characteristics at crack tip and environmentally assisted cracking growth rate of welded joints in nuclear power plants[D].Xi’an:Xi’an University of Science and Technology,2014.(in Chinese)
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[6]ASTM E.399-90:Standard test method for planestrain fracture toughness of metallic materials[J].Annual book of ASTM standards,1997,3:443-473.
[7]XUE He,LI Zhijun,LU Zhanpeng,et al.The effect of a single tensile overload on stress corrosion cracking growth of stainless steel in a light water reactor environment[J].Nuclear Engineering and Design,2011,241(3):731-738.
[8]薛河,薛晓峰,唐伟,等.镍基合金应力腐蚀裂尖氧化膜力学特性分析[J].稀有金属材料与工程,2011,40(7):1188-1190.XUE He,XUE Xiaofeng,TANG Wei,et al.Analysis on mechanical property of oxide film in stress corrosion cracking tip of Nickel-based alloys[J].Rare Metal Materisls and Engineering,2011,40(7):1188-1190.(in Chinese)
[2]BRUST F W,SCOTT P M.Weld residual stresses and primary water tress corrosion cracking in bimetal nuclear pipe welds[C]//ASME 2007Pressure Vessels and Piping Conference.[S.l.]:American Society of Mechanical Engineers,2007:883-897.
[3]贺定勇,李晓延,史耀武,等.裂纹长度、焊缝宽度及强度组配对焊接接头J积分的影响[J].焊接,2002(7):10-12.HE Dingyong,LI Xiaoyan,SHI Yaowu,et al.Effects fo crack length,weld width and strength matching on J-integral for welded joints[J].Welding&Joining,2002(7):10-12.(in Chinese)
[4]PENG Qunjia,XUE He,HOU Juan,et al.Role of water chemistry and microstructure in stress corrosion cracking in the fusion boundary region of an Alloy 182-A533Blow alloy steel dissimilar weld joint in high temperature water[J].Corrosion Science,2011,53(12):4309-4317.
[5]周恒,乐京霞,董岩,等.裂纹深度和裂纹开口位移的关系[J].中国科技论文,2013,8(5):449-451.ZHOU Heng,YUE Jingxia,DONG Yan,et al.Relationship between crack depth and crack opening displacement[J].China Sciencepaper,2013,8(5):449-451.(in Chinese)
[6]ASTM E.399-90:Standard test method for planestrain fracture toughness of metallic materials[J].Annual book of ASTM standards,1997,3:443-473.
[7]XUE He,LI Zhijun,LU Zhanpeng,et al.The effect of a single tensile overload on stress corrosion cracking growth of stainless steel in a light water reactor environment[J].Nuclear Engineering and Design,2011,241(3):731-738.
[8]薛河,薛晓峰,唐伟,等.镍基合金应力腐蚀裂尖氧化膜力学特性分析[J].稀有金属材料与工程,2011,40(7):1188-1190.XUE He,XUE Xiaofeng,TANG Wei,et al.Analysis on mechanical property of oxide film in stress corrosion cracking tip of Nickel-based alloys[J].Rare Metal Materisls and Engineering,2011,40(7):1188-1190.(in Chinese)