In many situations, we tend to change the mesh density to study its effect on simulation responses. Two issues things that are seldom addressed are the contact thickness and the mass-scaling which blend in with the true effects of the mesh refinement. As stated in some of the earlier posts, LS-DYNA computes the contact thickness [...]
Archive for August, 2007
Mesh Refinement Studies Involving Shell Elements
Published by August 28th, 2007 in LS-DYNA Bytes and LS-DYNA Elements. 2 CommentsDefault element sorting for 3-noded shell elements uses the collapsed BT formulation which is not recommended but is maintained for backward compatibility. The first option that LS-DYNA offers is to sort these elements to use a C0 triangular shell formulation which may provide better answers than the default formulation. LS-DYNA 971 (R3 and later) now [...]
Contact Surface Generation for Solid Elements
Published by August 23rd, 2007 in LS-DYNA Contact. 2 CommentsBy default, when a solid part ID is included in a contact slave or master part set, LS-DYNA generates a segment list for only the outer skin of the solid element volume. This is truly only if the slave or master set type is a segment list since for a node slave or master list, [...]
Consolidating Multiple Contact Definitions to a Single Contact
Published by August 23rd, 2007 in LS-DYNA Bytes and LS-DYNA Contact. 3 CommentsOver the last few years, the simplicity of defining a global AUTOMATIC_SINGLE_SURFACE contact to treat the interactions between multiple parts of varying stiffnesses and element types has changed the way we model contact interfaces. They are not only simple to define but also promote better modeling since they hugely eliminate the need to manually identify [...]
Principal Stress Calculator for Shell Elements in DYNAIN File
Published by August 1st, 2007 in LS-DYNA Bytes and LS-DYNA Output. 3 CommentsRecently, there was a request to ouput the principal stresses for each element at lower and upper surfaces of each shell element in DYNAIN file to use in some failure theories. I beleive this feature is a routine output in PamStamp simulations. To enable this, the attached ‘C’ code can be used that reads in [...]
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