RUM2021 RUM2021-EuroCentral CustomerPresentation
Abstract:
The presentation focuses on the performance of 3d volume-elements for thin-walled curved structures. Using volume-elements instead of shell-elements has different advantages. First of all no assumptions have to be made for the kinematics perpendicular to the shell-mid-plane. Second the user has access to the normal stress in the perpendicular direction, which can force delamination of composites in case of tension. At least the better performance of solid-elements in contact is mentioned, hence in comparison with shell formulations no rotational degrees of freedom have to be taken into account.
On the other side using solid-elements instead of shell-elements leads to larger systems of equations
whose solution is time-consuming. This drawback can be overcome using the increasing power of available workstations. So everything seems to be fine but there is another major drawback. Solid elements tend to locking phenomena, especially membrane-locking leads to artificial stiffness terms when approximating thin and curved structures. As a rule of thumb only cylindrical shells with a slenderness (radius over shellthickness) less than 300 can be approximated with solid-elements …
Speaker Info:
Sven Reinstädler was born on September 14, 1980 in Paderborn (Germany). After an apprenticeship as a carpenter (08.1997 - 06.2000) he received his entrance qualification for the university of applied sciences in Rosenheim where in September 2005 he became a graduate engineer in wood building and construction. For higher qualification he changed to the Technical University in Braunschweig where in October 2007 he gained his second academic degree in civil engineering, permitting to work as a research assistant at the associated institute of structural analysis. There he defended his doctoral thesis about a space-time single-phase level-set method applied on silo discharges in September 2015. After working as a postdoc, he has changed to the CENIT headquarters being placed in Stuttgart. In the position as consultant FEM since November 2018 he supports engineers in the field of numerical simulations.
