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论文类型：期刊论文

发表时间：2017-12-07

发表刊物：INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING

收录刊物：SCIE、EI、Scopus

卷号：112

期号：10

页面范围：1439-1472

ISSN号：0029-5981

关键字：multiscale finite elementmethod; porous media; localization; embedded strong discontinuity; enhanced coarse element; numerical base function

摘要：This paper presents a multiscale finite element method with the embedded strong discontinuity model for the strain localization analysis of homogeneous and heterogeneous saturated porous media. In the proposed method, the strong discontinuities in both displacement and fluid flux fields are considered. For the localized fine element, the mathematical description and discrete formulation are built based on the so-called strong discontinuity approach. For the localized unit cell, numerical base functions are constructed based on a newly developed enhanced coarse element technique, that is, additional coarse nodes are dynamically added as the shear band propagating. Through the enhanced coarse element technique, the multiscale finite element method can well reflect the softening behavior at the post-localization stage. Furthermore, the microscopic displacement and pore pressure are obtained with the solution decomposition technique. In addition, a non-standard return mapping algorithm is given to update the displacement jumps. Finally, through three representative numerical tests comparing with the results of the embedded finite element method with fine meshes, the high efficiency and accuracy of the proposed method are demonstrated in both material homogeneous and heterogeneous cases. Copyright (C) 2017 John Wiley & Sons, Ltd.