反平面变形下螺型位错的存在性和稳定性
Existence and stability of a screw dislocation under anti-plane deformation
摘要:
我们制定了一个变分模型的几何必要的螺旋位错在反平面晶格模型在零温度。晶格对称下的能量泛函的不变性使问题非强制性。然而,通过建立相对于弹性应变和浓度紧性原理的双稳态,我们证明了存在一个全局能量最小化,从而证明了在我们的模型中,位错是全局稳定的平衡。
英文摘要:
We formulate a variational model for a geometrically necessary screw dislocation in an anti-plane lattice model at zero temperature. Invariance of the energy functional under lattice symmetries renders the problem non-coercive. Nevertheless, by establishing coercivity with respect to the elastic strain and a concentration compactness principle, we prove existence of a global energy minimiser and thus demonstrate that dislocations are globally stable equilibria within our model.
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