Title: Pinball-based Contact-Impact Model with Parabolic Elements in EUROPLEXUS
Publisher: Publications Office of the European Union
Publication Year: 2014
JRC N°: JRC89913
ISBN: 978-92-79-37965-9
ISSN: 1831-9424
Other Identifiers: EUR 26629
OP LB-NA-26629-EN-N
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC89913
DOI: 10.2788/7022
Type: EUR - Scientific and Technical Research Reports
Abstract: Contact-impact algorithms are an important component of numerical simulation software in fast transient dynamics. Traditionally, contact algorithms have been based on so-called sliding lines and sliding surfaces. However, sliding-based algorithms may present some difficulties in detecting contact in complex geometrical situations, especially in 3D. The pinball contact-impact method as an alternative formulation has been implemented in EUROPLEXUS, initially based upon a strong Lagrange-multiplier based solution strategy of the contact constraints. Recently, at Onera Lille (F) some crash calculations involving many contacts were attempted, initially with linear displacement continuum elements (CAR4 in 2D). However, to improve accuracy and to help mitigate spurious locking phenomena, it was desired to perform the same calculations with parabolic elements, namely by the 9-node Lagrange element Q93. The present work considers two different approaches to modeling contact with parabolic elements. The first approach uses a phantom mesh of linear-displacement elements, used only for contact detection, and superposed to the structural mesh made of parabolic elements. Such a technique is fully general and could be useful also in other special contact situations, not only with parabolic elements. The second approach is based on a (new) ‘native’ pinball formulation for the parabolic elements, which has now been developed and implemented in EUROPLEXUS.
JRC Directorate:Space, Security and Migration

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