Treatment of friction combined with symmetries in the GLIS contact model of EUROPLEXUS
This report presents the correction of a friction model in the coupled version of the contact-impact algorithm based upon 3D sliding surfaces (GLIS) in the EUROPLEXUS code, when contact is combined with symmetry conditions.
Recently, EPX is being used to simulate vehicle crash against obstacles such as road barriers for safety and security studies and also fundamental experimental test campaigns on blast effects on clamped structures. These studies involve complex contact-impact scenarios, which may include at the same time situations typical of crash, characterized by large deformation of the contacting bodies, and other situations more typical of (smooth) contact. In some test cases, the effect of friction may be important, especially in the parts of the model undergoing smooth contact, and it must be included in the numerical simulations. Furthermore, in some cases it may be convenient to exploit geometrical symmetries of the models in order to drastically reduce the computational effort.
In some recent applications using the (LM-based, coupled) GLIS contact algorithm in symmetrized models with friction, it was noticed that the symmetry was occasionally broken for the contacting nodes on the plane(s) of symmetry and this lead to wrong on missed contact detection.
Therefore, the present work presents a correction of the friction algorithm of GLIS to properly deal with the simultaneous presence of one or more symmetry conditions on nodes which are also subjected to contact.
CASADEI Folco;
VALSAMOS Georgios;
LARCHER Martin;
2023-07-31
Publications Office of the European Union
JRC134231
978-92-68-05667-7 (online),
1831-9424 (online),
EUR 31596 EN,
OP KJ-NA-31-596-EN-N (online),
https://publications.jrc.ec.europa.eu/repository/handle/JRC134231,
10.2760/221188 (online),
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