Effective triangular shell elements are of utmost interest in engineering practice, and the MITC6a element – a 6 node quadratic general shell element of the MITC family – has been shown to significantly reduce the locking phenomena arising in bending dominated behaviours. However, for some specific combinations of midsurface geometry and boundary conditions, the MITC6a element features some non-physical displacement modes with vanishing membrane strain energy. This phenomenon is thoroughly analyzed, and a remedy based on a stabilized bilinear form is proposed. Detailed numerical tests are included and the results demonstrate the good performance of the proposed method both for membrane and bending dominated problems.
|Titolo:||Towards improving the MITC6a triangular shell element|
BEIRAO DA VEIGA, LOURENCO (Primo)
|Parole Chiave:||Shells ; Triangular MITC elements ; Spurious modes ; Stabilization ; Mixed formulations ; Locking|
|Settore Scientifico Disciplinare:||Settore MAT/08 - Analisi Numerica|
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||10.1016/j.compstruc.2007.03.003|
|Appare nelle tipologie:||01 - Articolo su periodico|