平板内后分叉的局部化带

LOCALIZATION BAND OF POST BIFURCATION IN PLANE SHEET

已知剪切带状分叉将引发裂隙．为模拟其后继效应，本文利用大应变有限元的空单元技术设计了自动释放损伤单元内残余应力的方法．这种损伤松弛可以具有各向同性或各向异性的性质．结果显示，受单向拉伸平板中心的水平裂隙会向斜角方向辐射局部化带，带内有明显厚度颈缩及平面错动．

In order to simulate the subsequent effect caused by the flaw which is initiated at shear band bifurcation, a large strain finite element analysis is employed with an empty element technique designed to automatically release the residual stresses in the damaged elements. The damage relaxation can have either isotropic or anisotropic property. It is demonstrated that inclined localization band does radiate from the flaw in plane sheet loaded uniaxially. Thickness necking and plane shearing can be obviously seen in the band. This fact supports the view that such bands observed in experiments are associated with post bifurcation effects.