Calculate principal stress for 3D solid elements

[yuweihwang]

Dear STKO team,

For 2D analysis, the STKO computes the principal stress for the user.
Is there any reason why we don't have this option for the 3D model (e.g., BickUP element with PDMY02)?

Sincerely,
Yu-Wei Hwang

[STKO Team]

SImply because the PDMY gives 7 components in the 3D stress (the 6 components of the stress and a 7th component related to the material itself).

In this way, STKO does not recognize it as a stress vector, and it does not compute the stress invariants.

Try use
material.stress.6
in the elemtal results of the MPCORecorder