# [Getdp] Stress Analysis GetDp

François Henrotte francois.henrotte at uclouvain.be
Tue Jul 3 16:00:57 CEST 2018

```Le 3 juil. 2018 à 13:30, Luca Montagliani <lucamontagliani at gmail.com<mailto:lucamontagliani at gmail.com>> a écrit :

We could better help if you would send a .geo and .pro file.
You should also tell what is exactly meant with « maximum stress state ».
Do you mean maximum Von Mises stress ?

Fr.

Hi All,
My problem is to determine the maximum stress state acting on a structure.
I would therefore like to understand how the .pos file is written in order to extract the maximum value directly from the file.

Then place an example.
from the .pro file I calculate the stress as:
{Name sigma; Value {
Term {[TensorV [C_xx [] * {d ux} + C_xy [] * {d uy} + C_xz [] * {d uz},
C_yx [] * {d ux} + C_yy [] * {d uy} + C_yz [] * {d uz},
C_zx [] * {d ux} + C_zy [] * {d uy} + C_zz [] * {d uz}]];
In Vol_Mec; Jacobian Vol; }
}
}
and therefore:
{Name stress; NameOfPostProcessing Elasticity_u;
Operation {
Print [sigma, OnElementsOf Vol_Mec, File "sigma.pos"];
Now the .pos file is:
TS (0.980007811853844,0,1.029813000728299,1.53102112193407,0,1.252665152081291,1.549809848214138,0,0.7456705669368301,1.46144890353805,0.025,1.248675086069074) {- 774520.2424171679, -23285.95950419134,4908270.764450434, -23285.95950419134, -2549506.633453323, -390329.9668088288,4908270.764450434, -390329.9668088288, - 362220.4075545655, -774520.2424171679, -23285.95950419134,4908270.764450434, -23285.95950419134, -2549506.633453323, -390329.9668088288,4908270.764450434, -390329.9668088288, -362220.4075545655, -774520.2424171679, -23285.95950419134,4908270.764450434, -23285.95950419134, -2549506.633453323, -390329.9668088288,4908270.764450434, -390329.9668088288, - 362220.4075545655, -774520.2424171679, -23285.95950419134,4908270.764450434, -23285.95950419134, -2549506.633453323, -390329.9668088288,4908270.764450434, -390329.9668088288, -362220.4075545655};

How should I interpret it?

I thank you in advance for the help you can give me.
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--
François Henrotte Dr Ir - francois.henrotte at uclouvain.be<mailto:francois.henrotte at uclouvain.be> - francois.henrotte at uliege.be<mailto:francois.henrotte at uliege.be>
UCL - Bât. Euler a.217 - Av. G. Lemaître 4-6 , B-1348 Louvain-la-Neuve - +32(0)10 47 23 64
ULg - Institut Montefiore I154 - Allée de la Découverte 10, B-4000 Liège - +32(0)4 366 37 36

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