Applied Mathematics and Mechanics (English Edition) ›› 2017, Vol. 38 ›› Issue (2): 231-242.doi: https://doi.org/10.1007/s10483-017-2163-9

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Modeling core-spreading of interface dislocation and its elastic response in anisotropic bimaterial

Jie LIU1, Yuheng ZHANG1, Haijian CHU1,2   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, and Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China;
    2. Department of Mechanics, College of Sciences, Shanghai University, Shanghai 200444, China
  • 收稿日期:2016-04-06 修回日期:2016-08-05 出版日期:2017-02-01 发布日期:2017-02-01
  • 通讯作者: Haijian CHU,E-mail:hjchu@shu.edu.cn E-mail:hjchu@shu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (No.11672173),the Shanghai Eastern-Scholar Plan,and the Innovation Program of Shanghai Municipal Education Commission

Modeling core-spreading of interface dislocation and its elastic response in anisotropic bimaterial

Jie LIU1, Yuheng ZHANG1, Haijian CHU1,2   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, and Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China;
    2. Department of Mechanics, College of Sciences, Shanghai University, Shanghai 200444, China
  • Received:2016-04-06 Revised:2016-08-05 Online:2017-02-01 Published:2017-02-01
  • Contact: Haijian CHU E-mail:hjchu@shu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (No.11672173),the Shanghai Eastern-Scholar Plan,and the Innovation Program of Shanghai Municipal Education Commission

摘要:

Interfacial dislocation may have a spreading core corresponding to a weak shear resistance of interfaces. In this paper, a conic model is proposed to mimic the spreading core of interfacial dislocation in anisotropic bimaterials. By the Stroh formalism and Green's function, the analytical expressions of the elastic fields are deduced for such a dislocation. Taking Cu/Nb bimaterial as an example, it is demonstrated that the accuracy and efficiency of the method are well validated by the interface conditions, a spreading core can greatly reduce the stress intensity near the interfacial dislocation compared with the compact core, and the elastic fields near the spreading core region are significantly different from the condensed core, while they are less sensitive to a field point that is 1.5 times the core width away from the center of the spreading core.

关键词: elastic field, interface dislocation, anisotropic bimaterial, core spreading

Abstract:

Interfacial dislocation may have a spreading core corresponding to a weak shear resistance of interfaces. In this paper, a conic model is proposed to mimic the spreading core of interfacial dislocation in anisotropic bimaterials. By the Stroh formalism and Green's function, the analytical expressions of the elastic fields are deduced for such a dislocation. Taking Cu/Nb bimaterial as an example, it is demonstrated that the accuracy and efficiency of the method are well validated by the interface conditions, a spreading core can greatly reduce the stress intensity near the interfacial dislocation compared with the compact core, and the elastic fields near the spreading core region are significantly different from the condensed core, while they are less sensitive to a field point that is 1.5 times the core width away from the center of the spreading core.

Key words: core spreading, elastic field, anisotropic bimaterial, interface dislocation

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