嵌入半无限矩阵的应变层中的位错

IF 2.6 4区 工程技术 Q2 MECHANICS
J. Colin
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引用次数: 0

摘要

嵌入半无限矩阵的薄层中的失配应力首先使用虚拟位错形式在结构的自由表面附近确定。根据Peach-Koehler力分析,边缘位错在相对于上界面倾斜的层的平面中滑动并出现在上界面和该自由表面的交叉点处的不同平衡位置(不稳定和稳定),然后就晶格失配和滑动平面的倾斜角进行了表征。已经发现位错可以在界面附近和/或自由表面附近表现出稳定的平衡位置。然后确定了位置稳定性与缺火参数和倾角的关系图。当位错在相对于界面水平轴倾斜的平面中滑动时,由于从自由表面引入边缘位错直到基体层界面的能量变化已经最终确定。最终确定了层的临界厚度,超过该临界厚度在界面中位错的形成在能量上是有利的,以及其相对于下界面中自由表面的位置。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dislocation in a strained layer embedded in a semi-infinite matrix
The misfit stress in a thin layer embedded in a semi-infinite matrix has been first determined near the free-surface of the structure, using the virtual dislocation formalism. From a Peach-Koehler force analysis, the different equilibrium positions (unstable and stable) of an edge dislocation gliding in a plane of the layer inclined with respect to the upper interface and emerging at the point of intersection of the upper interface and this free-surface have been then characterized with respect to the lattice mismatch and the inclination angle of the gliding plane. It has been found that the dislocation may exhibit stable equilibrium position near the interface and/or near the free-surface. A diagram of the position stability has been then determined versus the misfit parameter and the inclination angle. The energy variation due to the introduction of an edge dislocation from the free-surface until the matrix-layer interface has been finally determined, when the dislocation is gliding in the plane inclined with respect to the interface horizontal axis. A critical thickness of the layer beyond which the formation of the dislocation in the interfaces is energetically favorable has been finally determined as well as its position with respect to the free-surface in the lower interface.
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来源期刊
CiteScore
4.80
自引率
3.80%
发文量
95
审稿时长
5.8 months
期刊介绍: All areas of theoretical and applied mechanics including, but not limited to: Aerodynamics; Aeroelasticity; Biomechanics; Boundary layers; Composite materials; Computational mechanics; Constitutive modeling of materials; Dynamics; Elasticity; Experimental mechanics; Flow and fracture; Heat transport in fluid flows; Hydraulics; Impact; Internal flow; Mechanical properties of materials; Mechanics of shocks; Micromechanics; Nanomechanics; Plasticity; Stress analysis; Structures; Thermodynamics of materials and in flowing fluids; Thermo-mechanics; Turbulence; Vibration; Wave propagation
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