3D-FE-Analysis of CT-specimens including viscoplastic material behavior and nonlocal damage
3D-FE-Analysis of CT-specimens including viscoplastic material behavior and nonlocal damage
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CT 样本的 3D-FE 分析，包括粘塑性材料行为和非局部损伤
DOI：
10.1016/j.commatsci.2009.03.019
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发表时间：
2009
影响因子：
3.3
通讯作者：
D. Dinkler
中科院分区：
文献类型：
--
作者：
J. Velde;U. Kowalsky;T. Zümendorf;D. Dinkler
为了描述钢结构在失效前随时间变化的非弹性行为，在热力学框架内建立了考虑粘塑性材料行为、各向同性硬化、软化和各向同性延性损伤的材料模型。由于软化和损伤导致局部化的变形，该模型是扩展的非局部隐式梯度公式。一个额外的梯度方程制定的局部损伤变量，以实现独立的有限元离散化的结果。CT试件的三维结构分析验证了该方法的有效性。
In order to describe the time-dependent inelastic behavior of steel structures up to failure, a material model is developed within the framework of thermodynamics considering viscoplastic material behavior, isotropic hardening, softening, and isotropic ductile damage. Since softening and damage lead to localization of deformations, the model is extended by a non-local implicit gradient formulation. An additional gradient equation is formulated for the local damage variable in order to achieve results independent of the finite-element discretization. The approach is verified by 3D-structural analysis of CT-specimens.