Constitutive Model of Friction Stir Weld with Consideration of its Inhomogeneous Mechanical Properties

查看全文 作　　者：ZHANG [1]Ling;MIN [2]Junying;WANG [1]Bin;LIN [1]Jianping;LI [1]Fangfang;LIU [1]Jing

机构地区：[1]School of Mechanical Engineering, Tongji University;[2]Chair of Production Systems, Ruhr-University Bochum

出　　处：《Chinese Journal of Mechanical Engineering》索引2016年第29卷第2期,共8页

基　　金：Supported by National Natural Science Foundation of China(Grant No.51375346);Doctoral Fund of Ministry of Education of China(Grant No.20110072110056) 摘　　要：In practical engineering, finite element(FE) modeling for weld seam is commonly simplified by neglecting its inhomogeneous mechanical properties. This will cause a significant loss in accuracy of FE forming analysis, in particular, for friction stir welded(FSW) blanks due to the large width and good formability of its weld seam. The inhomogeneous mechanical properties across weld seam need to be well characterized for an accurate FE analysis. Based on a similar AA5182 FSW blank, the metallographic observation and micro-Vickers hardness analysis upon the weld cross-section are performed to identify the interfaces of different sub-zones, i.e., heat affected zone(HAZ), thermal-mechanically affected zone(TMAZ) and weld nugget(WN). Based on the rule of mixture and hardness distribution, a constitutive model is established for each sub-zone to characterize the inhomogeneous mechanical properties across the weld seam. Uniaxial tensile tests of the AA5182 FSW blank are performed with the aid of digital image correlation(DIC) techniques. Experimental local stress-strain curves are obtained for different weld sub-zones. The experimental results show good agreement with those derived from the constitutive models, which demonstrates the feasibility and accuracy of these models. The proposed research gives an accurate characterization of inhomogeneous mechanical properties across the weld seam produced by FSW, which provides solutions for improving the FE simulation accuracy of FSW sheet forming. 关键词：搅拌摩擦焊接本构模型非均匀力学性能应力-应变曲线机械性能数字图像相关单轴拉伸试验

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Constitutive Model of Friction Stir Weld with Consideration of its Inhomogeneous Mechanical Properties

参考文献(28)

引证文献(4)

耦合文献(61)

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