LS Dyna

LS Dyna

Stress and strain tensors derived output (pressure, von mises, etc) in d3plot

    • Veronique Bouvette


      I am trying to automate my post process analysis since a have many different simulations going on. I want to understand what is exactly in d3plot? Or how LSPP treats them?

      1. Do d3plot files contain derived output or only tensors? Using lasso-python library in python, I am only able do access stress and strain tensors... meaning I have to calculate Von Mises from the tensors at each elements for each state...
      2. Is there a way to flag certain derived output in d3plot which I can access with lasso-python library? It looks like LSPP computes derived outputs from tensors in d3plot (insetad of only retrieving derived outpouts, it computes it)

      How to you access the data you can fringe in LSPP via d3plot and wihtout using LSPP at all? Do I really have to calculate all derived outputs myself?


      Thank You

    • Andreas Koutras
      Ansys Employee


      Regarding the element stress state written in d3plot, d3plot contains the six stress components in the global or local material coordinate system (see CMPFLG of *DATABASE_EXTENT_BINARY), the effective plastic strain and any number of history variables specified (see NEIPH, NEIPS, BEAMIP of *DATABASE_EXTENT_BINARY) at the element's integration points (see MAXINT, NINTSLD, NEIPB of *DATABASE_EXTENT_BINARY).

      The pressure, von-Mises stress, principal stresses, triaxiality, etc. are calculated by LSPP during the post-processing, or can be calculated by the user. 

Viewing 1 reply thread
  • You must be logged in to reply to this topic.