Mesh-dependence of Material with Softening Behavior |
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Authors: | Fu Li Du Xingwen |
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Institution: | Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | The issue of mesh-dependence emerges when the conventional continuum damage model is applied to handling the softening behavior. In order to circumvent the mesh-dependence, the non-local theory is introduced into the conventional damage model and the finite element formulas are derived for two-dimensional gradient-enhanced damage model. A new element is proposed in which the basic unknown quantities are displacement, non-local equivalent strain and the gradient of non-local equivalent strain. The element and constitutive equation proposed in this article are added to the finite element software ABAQUS through user subroutine UEL. Numerical results show that the gradient-enhanced damage model can eliminate the mesh-dependence and is effective for dealing with the issue of softening behavior. |
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Keywords: | non-local theory gradient dependence softening behavior mesh-dependence Hermitian element finite el-ement method |
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