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Explicit dynamics in impact simulation using a NURBS contact interface
Author(s) -
Otto Peter,
De Lorenzis Laura,
Unger Jörg F.
Publication year - 2019
Publication title -
international journal for numerical methods in engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.421
H-Index - 168
eISSN - 1097-0207
pISSN - 0029-5981
DOI - 10.1002/nme.6264
Subject(s) - discretization , mass matrix , finite element method , diagonal , regularization (linguistics) , stiffness matrix , mathematics , penalty method , contact mechanics , spectral element method , nonlinear system , contact force , mathematical analysis , mathematical optimization , computer science , mixed finite element method , geometry , classical mechanics , structural engineering , engineering , physics , quantum mechanics , artificial intelligence , nuclear physics , neutrino
Summary In this paper, the impact problem and the subsequent wave propagation are considered. For the contact discretization an intermediate non‐uniform rational B‐spline (NURBS) layer is added between the contacting finite element bodies, which allows a smooth contact formulation and efficient element‐based integration. The impact event is ill‐posed and requires a regularization to avoid propagating stress oscillations. A nonlinear mesh‐dependent penalty regularization is used, where the stiffness of the penalty regularization increases upon mesh refinement. Explicit time integration methods are well suited for wave propagation problems, but are efficient only for diagonal mass matrices. Using a spectral element discretization in combination with a NURBS contact layer the bulk part of the mass matrix is diagonal.