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**highpressuretube****Member**- From: Werther
- Registered: 2014-12-02
- Posts: 48

Hi all,

what is the most elegant way to calculate mean stresses for a STAT-NON-LIN calculation? Let's imagine I have lower bound stress values at t=4,0 and upper bound stress values at t= 6,0 how do I calculate the mean principal stress?

I.e. mean stress = (RESU_SIEQ_NOEU.PRIN1(t=6) + RESU_SIEQ_NOEU.PRIN1(t=4)) / 2. I just don't manage to make the Paraview calculators work.

Or do you calculate mean stresses more elegantly within code aster?

Best regards,

highpressuretube

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**PierreG****Member**- Registered: 2011-12-29
- Posts: 22

Hello highpressure,

you can create two fields for time t=4 and time t=6 with CREA_CHAMP(OPERATION='EXTR'). Then you can combine them always with CREA_CHAMP but with option OPERATION='ASSE'.

Regards

Pierre

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**highpressuretube****Member**- From: Werther
- Registered: 2014-12-02
- Posts: 48

Hi Pierre,

thanks for the idea. That means I would include that code after CALC_CHAMP, right? Or before? I still haven't understood 100% how aster is setting up its database.

I have experimented with Paravis in the meanwhile. Result in the picture attached. But I prefer your suggestion so I will try to follow it with the next calculation I do.

Regards,

highpressuretube

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**highpressuretube****Member**- From: Werther
- Registered: 2014-12-02
- Posts: 48

Finally up to including the calculation in Aster itself, but already the firsten question arose: Which TYPE_CHAM are my results for a simple STAT_NON_LINE calculation?

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