Interface traction stress of 3D dislocation loop in anisotropic bimaterial
Interface traction stress of 3D dislocation loop in anisotropic bimaterial
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DOI：
10.1016/j.jmps.2015.10.011
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发表时间：
2016-02
影响因子：
5.3
通讯作者：
Wenwang Wu;C. Lv;Jinhuan Zhang
中科院分区：
文献类型：
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作者：
Wenwang Wu;C. Lv;Jinhuan Zhang
摘要应用离散快速傅里叶变换（FFT），给出了各向异性双材料系统界面弹性场的半解析解，分别采用完全粘结、类位错、类力和类线性弹簧界面模型。界面弹性场是体应力场、自由表面松弛镜像应力场和界面牵引应力场的线性叠加。理想结合双材料的界面象能可以通过界面上的面积积分来求解，其中考虑了多个分应力场的贡献。通过对Cu-Nb双材料中位错环的计算，验证了该方法的有效性。研究了类位错界面模型Ku =[kiju]、类力界面模型Kt =[kijt]和类线性弹簧界面模型Ks = diag [KT，KN]的影响.并对理想界面模型与非理想界面模型、各向同性模型与各向异性模型之间的差异进行了分析。结果表明，界面条件和各向异性对界面弹性场有显著影响。
Abstract By applying discrete Fast Fourier Transformation (FFT), semi-analytical solutions are developed to calculate the interface elastic fields of anisotropic bimaterial systems with perfect bonding, dislocation-like, force-like and linear spring-like interface models. Interface elastic fields are the linear superimposition of bulk stress, free surface relaxation image stress and interface traction stress (ITS) fields. Interface image energy of perfect bonding bimaterials can be solved through area integral over the interface plane, including the contribution of several componential stress fields. Calculation examples on dislocation loops within Cu–Nb bimaterial are performed to demonstrate the efficiency of such approaches. Effects of K u=[k ij u] for the dislocation-like, K t=[k ij t] for the force-like and K s= diag [K T, K N] for the linear spring-like imperfect interface models are investigated. Differences between perfect bonding and imperfect interface models, isotropic and anisotropic models are also studied. It is found that interface conditions and anisotropy have drastic effects on the interface elastic fields.