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Extrapolate stresses in solid elements in LS-PrePost v3.2

If setting NINTSLD=8 on *DATABASE_EXTENT_BINARY, LS-DYNA will write stresses at all integration points for solid elements to the d3plot file. When this option is set, LS-PrePost applies the stress values to the nodes from the closest integration point and after that, the average value from the contributions are computed and presented in the stress fringe plot.

If setting NINTSLD=8 on *DATABASE_EXTENT_BINARY, LS-DYNA will write stresses at all integration points for solid elements to the d3plot file.
When this option is set, LS-PrePost applies the stress values to the nodes from the closest integration point and after that, the average value from the contributions are computed and presented in the stress fringe plot.

 

A command line option is added to LS-PrePost v3.2, which will linearly extrapolate the values from integration points to the nodes. TET10 elements can have 4 or 5 integration points (set on NIPTETS on *CONTROL_SOLID) and the extrapolation has to be done slightly different depending on this value.

 

Extrapolate 4

will extrapolate the stress correctly for TET10 (and hexa elements) when NIPTETS=4, and

Extrapolate 5

will extrapolate the stress correctly for TET10 (and hexa elements) when NIPTETS=5.

 

This post-processing option should however be used with care. It is only appropriate to do this extrapolation if the material is behaving linear elastic. That is, this option should NOT be used when the material undergo plastic deformation.

 

Example showing the effect of this option on a cantilever beam composed of TET10 elements which has a moment applied on its free end.