Abstract
An automatic contact searching algorithm for dynamic finite element analysis is described. The contact searching algorithm is based on the hierarchy and the territory concepts in the general hierarchy-territory algorithm (HITA). However, the definition of contact bodies is not used and contact surfaces are restricted to three regular types, which facilitate data management, reduce storage space and improve computational efficiency. Although contact surfaces are restricted to three types, the contact algorithm can handle a contact system with an arbitrary mesh layout. Contact nodes, contact edges, contact segments and contact surfaces are all generated automatically, relieving users from tedious input for contact interfaces. The contact algorithm can handle complex shell structures and/or solid structures. Boundary segments in solid structures are also generated automatically by computers. The contact searching algorithm has been implemented in the finite element program LS-DYNA3D and examined via numerical examples. Numerical experiments show that the algorithm is reliable and efficient.
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