Interface effects on elastic behavior of an edge dislocation in a core-shell nanowire embedded to an infinite matrix

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:50

Article

Gutkin, M. Yu.^1,2,3  Enzevaee, C.⁴  Shodja, H. M.^4,5 

[1] Russian Acad Sci, Inst Problems Mech Engn, St Petersburg 199178, Russia

[2] St Petersburg State Polytech Univ, Dept Phys Mat Strength & Plast, St Petersburg 195251, Russia

[3] St Petersburg State Univ, Dept Theory Elast, St Petersburg 198504, Russia

[4] Sharif Univ Technol, Dept Civil Engn, Tehran 111559313, Iran

[5] Shatif Univ Technol, Inst Nanosci & Nanotechnol, Tehran 111559161, Iran

关键词: Interface elasticity;    Embedded core-shell nanowire;    Edge dislocation;    Image force;    Strain energy;    Stress field;   

DOI  :  10.1016/j.ijsolstr.2012.12.008

来源: Elsevier

【 摘 要 】

The elastic behavior of an edge dislocation located inside the core of a core-shell nanowire which is embedded in an infinite matrix is studied within the surface/interface elasticity theory. The corresponding boundary value problem is solved exactly by using complex potential functions. An important parameter so-called interface characteristic parameter which has the dimension of length and is a combination of the interface moduli enters the formulations. The stress field of the dislocation, image force acting on the dislocation, and the dislocation strain energy is calculated by considering the interface effect. The introduced characteristic parameter allows the examination of the core-shell size on the image forces acting on the dislocation. The repelling and attracting effects of the interface parameter on the image force are discussed. The equilibrium position of the dislocation is also studied. The dislocation strain energy in the interface elasticity framework is only slightly different from that of traditional elasticity when the dislocation is placed in the central region of the core and reaches its maximum value when it is located near the core-shell interface. (C) 2013 Elsevier Ltd. All rights reserved.

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