Memory in LS-DYNA is specified in “words” at the execution time. The term “word” refers to the amount of data that can be written to or read from a memory in one operation. The following figure will aid in the relationships of bits, the most basic data type, to words on various computers. One bit [...]
Archive for October, 2006
A Few “Words” on Memory Settings in LS-DYNA
Published by October 27th, 2006 in LS-DYNA Bytes. 0 CommentsModeling Symmetric/Unsymmetric NonLinear Discrete Springs
Published by October 20th, 2006 in LS-DYNA Elements and LS-DYNA Materials. 2 CommentsDiscrete springs provide a easy way to model complicated systems by using their responses in the material definitions. This post brings attention to the way LS-DYNA handles the default behavior in tension or compress when the material input does not pass through the origin (0,0) but simply begins from origin. When only one of [...]
Limitations of Penalty Joint Treatment in LS-DYNA
Published by October 19th, 2006 in LS-DYNA Connections. 0 CommentsLS-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 [...]
Storing Re-Usable Models in a Central Location with *INCLUDE_PATH
Published by October 12th, 2006 in LS-DYNA Bytes. 0 CommentsBeginning version 971 and later, LS-DYNA allows easy way to store models in a central location for use at run time. This feature can be turned on using *INCLUDE_PATH which takes unlimited number of absolute directory names. When INCLUDE_PATH is used, LS-DYNA first checks the file, specified using *INCLUDE keyword, in the local directory and [...]
Best Practices for Modeling Recoverable Low Density Foams - By Example
Published by October 12th, 2006 in LS-DYNA Bytes. 7 CommentsAttachments: mat57_default.k.gz
Modeling recoverable foams poses several challenges in crash worthiness as well as in low-to-medium impact velocity conditions. This is due to its relatively low stiffness when compared with structural materials which has an indirect effect on its contact-impact interactions with other materials. To review the best practices when modeling such components, we can consider [...]
Simulation Based Product Design Using LS-DYNA - Single Code & Single Model Benefits
Published by October 6th, 2006 in LS-DYNA Bytes. 0 CommentsOver the past decade, the ability of simulations driving the design has grown rapidly and today’s confidence in simulations results is a good testament to it. Two significant areas that have contributed to this is the “Numerical Modeling Awareness” and “Design Domain Knowledge” gained over the years by design and analysis community. Numerical modeling awareness [...]
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