Engine Keyword Solid element control for elements with negative volumes. Switch to small strain formulation or stop the run a solid elements volume becomes negative.




Field Content SI Unit Example
SMSTR (Default)
When an element’s volume is negative automatically switch's to the small strain formulation option and continues the solution.
When an element’s volume is negative, stop the analysis immediately.


  1. By default, when the volume of a solid element becomes negative, the element is changed to a small strain formulation and the simulation continues. See /PROP/TYPE14 (SOLID) comments for more details about the switch to small strain.