INSTITUTO DE ESTUDIOS AVANZADOS EN INGENIERIA Y TECNOLOGIA
Unidad Ejecutora - UE
A simple reduced integration hexahedral solid-shell element for large strains
FLORES FERNANDO G.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
ELSEVIER SCIENCE SA
Lugar: Amsterdam; Año: 2016 vol. 303 p. 260 - 260
In this paper a hexahedral solid-shell element with in-plane reduced integration is developed. The element is intended to the analysis of thin/thick elastic-plastic shells with moderate to large strains. Developed within the framework of a total Lagrangian formulation, the element uses as strain measure the logarithm of the right stretch tensor (U) obtained from a modified right Cauchy-Green tensor (C} ). The modifications, in order to remove transverse shear, Poisson and volumetric locking, are three: a) a classical assumed mixed shear strain approximation for C_13 and C_23 b) an assumed strain approximation for the in-plane components C_ab and c) an enhanced assumed strain for the through the thickness normal component C_33 (one additional degree of freedom). The first five components of C are interpolated to the integration points from values at the center of the top and bottom faces. An arbitrary number of integration points is used in the transverse direction and a stabilization scheme is used to avoid spurious modes due to the in-plane sub integration. Several examples are presented that show the locking-free behavior and the very good performance of the presented element for the analysis of shells with geometric and material nonlinearities, including quasi-incompressible elastic and elastic-plastic with incompressible plastic flow models.