In mesh independent deformable spotwelds (see here ), the actual spotwelds are represented using either beams or solids (single or cluster). The nodes of the beam or solid element representing the spotweld are then tied to the sheet metal using a tied interface (TIED_SHELL_EDGE_TO_SURFACE or TIED_NODES_TO_SURFACE). The forces experienced by the beam are the [...]
Archive for November, 2007
Eliminating Contact Force Interference in Spotweld Forces Using SPOTTHIN in *CONTROL_CONTACT
Published by November 2nd, 2007 in LS-DYNA Bytes, LS-DYNA Connections and LS-DYNA Contact. 0 CommentsContact and Global Timestep
Published by November 1st, 2007 in LS-DYNA Bytes and LS-DYNA Contact. 0 CommentsYou may have seen this popular message that is printed out by LS-DYNA for every simulation.
The LS-DYNA time step size should not exceed 0.456E-06 to avoid contact instabilities. If the step size is bigger then scale the penalty of the offending surface
Lets review this to understand a little [...]
Shell Element Stress and Strain Output to D3PLOT - A Brief Overview
Published by November 1st, 2007 in LS-DYNA Bytes. 1 CommentA few questions recently from some users while teaching a class prompted me to write this overview regarding the data output, particularly for shell elements, into D3PLOT and how the post-processors plot them. The brief overview is listed in the form of list items for a quick read.
1. Element output are always element centered and [...]
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