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平板内后分叉的局部化带
引用本文:李国琛,黄涛.平板内后分叉的局部化带[J].力学学报,1996,28(4):406-411.
作者姓名:李国琛  黄涛
作者单位:中科院力学所,LNM,100080
基金项目:中国科学院基金,中国科学院力学研究所非线性连续介质力学开放研究实验室,国家自然科学基金
摘    要: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.由此说明实验所观察到的这类局限于带内的变形应属于后分叉的效应

关 键 词:局部化  后分叉  颈缩  金属板  空单元  损伤力学

LOCALIZATION BAND OF POST BIFURCATION IN PLANE SHEET
Li Guochen,Huang Tao.LOCALIZATION BAND OF POST BIFURCATION IN PLANE SHEET[J].chinese journal of theoretical and applied mechanics,1996,28(4):406-411.
Authors:Li Guochen  Huang Tao
Abstract: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.
Keywords:localization  post  bifurcation  necking
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