*MAT_PIECEWISE_LINEAR_PLASTICITY (*MAT_024) is widely used material model for metals and in some cases plastics. Its popularity is widespread since it offers several plasticity models and can also be strain-rate dependent. One particle parameter, the Yield Stress, in the material card can appear in more than one place and can be sometimes confusing to know [...]
Archive for December, 2007
Yield Stress, Strain-rate Dependency in MAT_024 and the significance of SIGY
Published by December 20th, 2007 in LS-DYNA Bytes. 0 Commentsd3View v2.0beta - LS-DYNA Simulation Data Manager - Releasing Shortly
Published by December 17th, 2007 in LS-DYNA Bytes. 0 CommentsSince the first release of d3View, there have been many incremental but bold steps that were taken to tackle the problem of simulation data management especially related to LS-DYNA. I am proud to announce the next generation of simulation data manager that will be available shortly to worldwide users in the form of d3View v2.0 [...]
Force Deflection to Effective Stress vs Effective Strain
Published by December 13th, 2007 in LS-DYNA Bytes. 0 CommentsAttached is a simple code that I wrote a while back to convert a force-deflection/engineering-stress_strain/true_stress_strain curve to effective stress vs effective strain curve. The input is a simple LS-DYNA valid keyword file with *define_curve keyword. Its not an elegant code but works in most cases. A sample curve is also included.
I am working on extending [...]
Initial velocity is always specified to a single node and can carry only one value. Multiple initial velocity definitions for the same node will always use the last encountered value. To illustrate this, if we have nodes N1,N2 and N3 and we define a initial velocity for all nodes to be ‘V1′ followed by N2 [...]
Simulation “Pack” to Perform Design or Numerical Variable Studies
Published by December 10th, 2007 in LS-DYNA Bytes. 0 CommentsIn an iterative simulation process, the main problem or difficulty is to use the existing results to understand its dependency on certain variables (design or just numerical). This difficulty, often causes us to rerun the simulations in a more controlled environment. Let me illustrate this with a simple problem in which we have some v1-v10 [...]
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