ADAPTIVE MESHING FOR DYNAMIC STRAIN LOCALIZATION

A mesh enrichment procedure is developed to capture the shear band for strain localization in elasto-(visco)-plastic solids. The enriched me sh comprises four and five noded quadrilateral elements which can be a daptively refined in the localized zone. The criterion for mesh adapti on combines three well-known localization characteristics to predict t he onset of localization in individual elements. A modified procedure for transferring state variables between two successive refined meshes is proposed. The procedure is tested by solving several sample proble ms. Consistent and stable solutions are obtained. In particular, shear band widths and plastic strains are found to converge to stable value s. The results are compared with solutions using the enriched displace ment procedure defined in [1]. The efficiency of the global adaptive s cheme is tested on initial- and boundary-value problems that involve d ifferent material properties and geometries.