Delamination and Tiebreak Contact
Although the jury is still out, I think people are finding tiebreak contact to be less problematic than cohesive elements. Section 3.5.1, "Composite Delamination", of the Modeling Guidelines Document (MGD), available under "Resources" at http://awg.lstc.com, offers some pertinent tips. See also the example "Ballistic Impact on Composite Plate" at http://awg.lstc.com/tiki/tiki-index.php?page=QA+test+example+7. First of all, for modeling delamination, you'd need to model each ply with a layer of elements. *contact_automatic_one_way_surface_to_surface_tiebreak with OPTION 6,7, or 9 (solids) One approach would be to model a layer of shell or solid elements for each composite layer and bond the layers with a tiebreak contact, e.g., or OPTION 8,10, or 11 (shells). input variables in *mat_138 as follows: Refer to *mat_138 for a detailed description of t...