Archive for the 'LS-DYNA Connections' Category

Eliminating Contact Force Interference in Spotweld Forces Using SPOTTHIN in *CONTROL_CONTACT

Published by Suri Bala November 2nd, 2007 in LS-DYNA Bytes, LS-DYNA Connections and LS-DYNA Contact. 0 Comments

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 [...]

Deformable Spotwelds in LS-DYNA

Published by Suri Bala December 16th, 2006 in LS-DYNA Connections. 0 Comments

Over the years, spotweld representation for crash and NVH applications have evolved from a crude to a detailed modeling resulting in reduced pre-processing effort while greatly enhancing the accuracy of numerical models. Here is link that gives a brief overview of spotwelding process in LS-DYNA. Please note that the document is over 2 years [...]

Limitations of Penalty Joint Treatment in LS-DYNA

Published by Suri Bala October 19th, 2006 in LS-DYNA Connections. 0 Comments

LS-DYNA supports various joint definition types such as spherical, cylindrical, etc (please refer to the LS-DYNA User’s manual for a complete list). Irrespective of the joint definition type and the elements associated, translational constraints are applied to the joint nodes to model appropriate behavior. The constraints are applied using the default penalty formulation whose stiffness [...]

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