期刊
FINITE ELEMENTS IN ANALYSIS AND DESIGN
卷 47, 期 12, 页码 1326-1336出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.finel.2011.08.001
关键词
Regularized XFEM; Continuous-discontinuous transition; Concrete-like bulk; Mesh independence
资金
- Italian Prin fund [2009XWLFKW]
The focus is on a Regularized eXtended Finite Element Model (REXFEM) for modeling the transition from a local continuum damage model to a model with an embedded cohesive discontinuity. The discontinuity surface and the displacement jump are replaced by a volume, whose width depends on a regularization length, and by a regularized jump function, respectively. By exploiting the property that the stress-strain work spent within the regularized discontinuity, for vanishing regularization, is equivalent to the traction-separation work dissipated in a zero-width discontinuity surface, a mesh size independent transition from the continuous displacement regime to the discontinuous displacement regime is obtained. Sub-elemental enrichment is considered, leading to a localization band restricted to a single layer of finite elements, like in the smeared-crack approach. Therefore, a comparison in the two-dimensional case with a literature model and with a commercial code which are based on the smeared-crack approach is presented. (C) 2011 Elsevier B.V. All rights reserved.
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