In cases where a monotonically increasing curve such as pressure_vs_leakage in *AIRBAG or effective_stress_vs_effective_strain in plasticity models in *MAT are to be parametrically identified by an optimization software such as LS-OPT to match against a physical test, it is important to ensure that the points identified by LS-OPT satisfy the non-negative slope. To satisfy this, [...]
Author Archive for Suri Bala
Optimizing monotonically increasing load curves
Published by October 9th, 2008 in LS-DYNA Bytes. 0 CommentsIn these days, a finite element model consists of several INCLUDE files either relative or absolute. When collaborating with other people, it is very difficult to remember sending the included files and also if we do remember, it is cumbersome if not difficult to find them and zip them as one file. I recently encountered [...]
In older versions of LS-DYNA (950 and lower) , when mass-scaling was active and over the course of the simulation when the percentage of added mass was greater than ENDMASS in *CONTROL_TERMINATION , LS-DYNA would terminate that job with no additional message. However, recent versions of LS-DYNA terminate the job AND provide a list of [...]
Here are the release notes.
Features and enhancements included in 971 R3.2 that were not available in 971 R3.1 include the following:New Material Models:*MAT_255 ()Enhanced Material Models:support of user defined failure for:- *MAT_123 (VP=1)- *MAT_103- *MAT_024 (VP=1)*MAT_191 now supports end release for beams*MAT_187 updates*MAT_126 add corotational local coord. system for formulation-1Add V option for aopt=3,4- [...]
Running LS-DYNA jobs (either interactively or as a batch job) can be interrupted with sense-switch controls by creating files “d3kil”, “D3KIL” and “switch” in the running directory. This works as expetec without the use of any “jobid” definition. However, when using a jobid parameter either using *KEYWORD_ID or in the command line (jobid=jobname), LS-DYNA expects [...]
D3VIEW Update : LS-DYNA Examples Project Now Available for Public
Published by August 10th, 2008 in d3view. 0 CommentsThe LS-DYNA Examples Project , managed using D3VIEW, is now available for public usage.
If you want to become part of the team to contribute to the examples set, you can send me an email at INFO at D3VIEW dot COM.
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