Incompatible Modes for Volumetric Shell Elements in Explicit Time Integration



Explicit time integration is characterized by small time steps and efficient global operations, leading to a domination of element processing regarding CPU-time, in particular, as diagonal mass matrices are used. The Enhanced Assumed Strain (EAS) approach requires local operations in order to condense-out additional degrees of freedom. The method of Incompatible Modes (IM) is presented as an alternative, where incompatible degrees of freedom are included in the global equations, which leads to efficient element formulations. (© 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim)