Past, Present and Future of Writing
My son’s, who is in 3rd grade, rendition of how we may be writing in the future …..
Visualization of Triaxiality Factor in LS-PrePost
Stress Triaxiality is the ratio of Hydrostatic stress and the von-Mises stress and is known to have a great influence on the plastic deformation. You can view this factor in LS-PrePost now as shown below.
LS-DYNA Advanced Class in Detroit
Its been a while since my last post. I wanted to take the time to share that I will be teaching an LS-DYNA Class in Detroit, Michigan. You can visit Registration for more information. FEA Information will be including more information on this in its next publication.
LS-Prepost on Mac !
LS-PrePost development version 3.2 is now released for Macs. Below is a screenshot of LS-PrePost running on a MacBook Pro. You can download it Here Click to Enlarge:
Oasys 4th LS-DYNA Update Meeting in Pune and Bangalore
I will be attending the upcoming LS-DYNA Update meeting in Pune (May 3, 2011) and Bangalore (May 5, 2011). You can find more information at LS-DYNA Update meeting . If you are in Pune or Bangalore, it will be great to see you there.
Tensile failure in Low Density Foams
When modeling low-density foams, it is important to consider potential failure under tensile loading. In LS-DYNA, the most popular constitutive material model is MAT_LOW_DENSITY_FOAM (MAT_057), in which the default treatment of foams under tensile loading is linear with no failure. The Elastic Modulus (Emax) in tension is computed to be the max( max(slope of the…
Viewing Contact Frictional Energy
When friction is enabled in contact treatment using static or dynamic fricition coefficients (FS, FD in *CONTACT), the energy dissipated due to friction can be recorded and visualized. The parameter that tells LS-DYNA to ouput the frictional energy is FRCENG in *CONTROL_CONTACT. FRCENG by default is set to 0 to ignore the recording and output…
Hybrid LS-DYNA
With the recent growth of multi-core chips, scalibility of pure MPP LS-DYNA beyond 128 cores has shown degration due to several factors including latency and network communications. LSTC has recently developed a new code named “Hybrid LS-DYNA” that provides sustained scalibility for large number of cores and also yields digit-2-digit repeatibility when changing the number…
Mat224 Keyword Manual Pages
Several of you requested the manual pages for the newly developed tabulated Johnson-Cook constitutive law now labeled as MAT_224. Here are the three pages of the keyword manual. MAT224 All Pages [ Click the image to enlarge] MAT224 Page 1 [ Click the image to enlarge] MAT224 Page 2 [ Click the image to enlarge]…
Shell Local Material Axis Definition for Orthotropic Material
Most orthotropic material rely on the parameter AOPT to define the change/update the default material axes defined by LS-DYNA. The default axis for every shell element is based on the order of the node numbers if INN=0 which is then based on N1-N2 and the cross-product of N1-N2 and N1-N4. The default material axes may…