AUTOMATED BAND IDENTIFICATION PROCEDURE FOR DYNAMIC STRAIN LOCALIZATION

The enriched displacement procedure described in [1] is used in order to capture the detailed structure of the strain field within shear ban ds during strain-localization. A method to select elements to be enric hed which combines three well-known localization characteristics is pr oposed. A parameter analysis is performed to define appropriate values for the enrichment delimiters. Once the elements to be enriched have been selected, an automated procedure is used to identify the location s and orientations of the shear bands in the mesh. The procedure uses elementary cluster detection and line-fitting techniques and can ident ify up to two simultaneously forming shear bands. A method to place th e enriched patch inside elements through which the shear bands pass is developed. Numerical results are presented to illustrate the approach .