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<div>Hello Luca,</div>
<div><br>
</div>
<div>VonMises is one of the display options for tensor fields.</div>
<div>To see that, click open the Option window of the view </div>
<div>(click on the little black triangle besides the View) and check in the « Aspect » tab</div>
<div>the « Tensor display » option. </div>
<div><br>
</div>
<div>If you want to compute it effectively, you can also </div>
<div>define the following function in the pro file:</div>
<div><br>
</div>
<div><br>
</div>
<div>Function {</div>
<div> ...</div>
<div><br>
</div>
<div> VM[] = Sqrt[ (CompXX[$1]-CompYY[$1])^2/2</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> + (CompYY[$1]-CompZZ[$1])^2/2</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> + (CompZZ[$1]-CompXX[$1])^2/2</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> + 3*(CompXY[$1]^2 + CompYZ[$1]^2 + CompZX[$1]^2) ]; </div>
<div><br>
</div>
<div>}</div>
<div><br>
</div>
<div><br>
</div>
<div>and use it in a PostQuantity</div>
<div><br>
</div>
<div>
<div><br>
</div>
<div>PostProcessing {</div>
<div> { Name Elasticity_u; NameOfFormulation Elasticity_u;</div>
<div> PostQuantity {</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span>...</div>
</div>
<div>
<div> { Name sigma; Value { Term { </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> [ TensorV[ C_xx[]*{d ux} + C_xy[]*{d uy} + C_xz[]*{d uz},</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> C_yx[]*{d ux} + C_yy[]*{d uy} + C_yz[]*{d uz},</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> C_zx[]*{d ux} + C_zy[]*{d uy} + C_zz[]*{d uz} ] ];</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> In Vol_Mec; Jacobian Vol; } } }</div>
<div> { Name sigmaVM; Value { Term { </div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> [ VM[ TensorV[ C_xx[]*{d ux} + C_xy[]*{d uy} + C_xz[]*{d uz},</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> C_yx[]*{d ux} + C_yy[]*{d uy} + C_yz[]*{d uz},</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> C_zx[]*{d ux} + C_zy[]*{d uy} + C_zz[]*{d uz}] ] ];</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> In Vol_Mec; Jacobian Vol; } } }</div>
</div>
<div>}}}</div>
<div><br>
</div>
<div>
<div>PostOperation {</div>
<div> { Name spostamenti; NameOfPostProcessing Elasticity_u;</div>
<div> Operation {</div>
</div>
<div> …</div>
<div><span class="Apple-tab-span" style="white-space:pre"></span> Print[ sigmaVM, OnElementsOf Vol_Mec, File "sigmaVM.pos"];</div>
<div>}}}</div>
<div><br>
</div>
<div>With this you generate directly the scalar field map you need in the file « sigmaVM.pos ». </div>
<div><br>
</div>
<div>Finally, the format of the tensor field</div>
<div><br>
</div>
<blockquote type="cite">
<div>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};</div>
</blockquote>
<div><br>
</div>
<div>is to be interpreted as follows:</div>
<div>« TS » means « tensor tetrahedron » </div>
<div>The 12 numbers enclosed in () are the XYZ coordinates of the 4 vertices of the tetrahedral element.</div>
<div>The 36 numbers enclosed in {} are the 9 components of the tensor</div>
<div>at the 4 nodes of the element. </div>
<div>As first order elements are used here, the tensor takes the same value at all nodes of the element. </div>
<div><br>
</div>
<div><br>
</div>
<div>Regards,</div>
<div><br>
</div>
<div>Fr.</div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>
<div>Le 3 juil. 2018 à 16:00, François Henrotte <<a href="mailto:francois.henrotte@uclouvain.be">francois.henrotte@uclouvain.be</a>> a écrit :</div>
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<div>Le 3 juil. 2018 à 13:30, Luca Montagliani <<a href="mailto:lucamontagliani@gmail.com">lucamontagliani@gmail.com</a>> a écrit :</div>
<div><br>
</div>
<div><br>
</div>
<div>We could better help if you would send a .geo and .pro file.</div>
<div>You should also tell what is exactly meant with « maximum stress state ».</div>
<div>Do you mean maximum Von Mises stress ?</div>
<div><br>
</div>
<div>Fr. </div>
<div><br>
</div>
<div><br>
</div>
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<blockquote type="cite">Hi All,<br>
My problem is to determine the maximum stress state acting on a structure.<br>
I would therefore like to understand how the .pos file is written in order to extract the maximum value directly from the file.<br>
<br>
Then place an example.<br>
from the .pro file I calculate the stress as:<br>
{Name sigma; Value {<br>
Term {[TensorV [C_xx [] * {d ux} + C_xy [] * {d uy} + C_xz [] * {d uz},<br>
C_yx [] * {d ux} + C_yy [] * {d uy} + C_yz [] * {d uz},<br>
C_zx [] * {d ux} + C_zy [] * {d uy} + C_zz [] * {d uz}]];<br>
In Vol_Mec; Jacobian Vol; }<br>
}<br>
}<br>
and therefore:<br>
{Name stress; NameOfPostProcessing Elasticity_u;<br>
Operation {<br>
Print [sigma, OnElementsOf Vol_Mec, File "sigma.pos"];<br>
Now the .pos file is:<br>
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};<br>
<br>
How should I interpret it?<br>
<br>
I thank you in advance for the help you can give me.<br>
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<div>--</div>
<div>François Henrotte Dr Ir - <span style="text-align: -webkit-auto;"><a href="mailto:francois.henrotte@uclouvain.be">francois.henrotte@uclouvain.be</a></span><span style="text-align: -webkit-auto;"> - </span><span style="text-align: -webkit-auto;"><a href="mailto:francois.henrotte@uliege.be">francois.henrotte@uliege.be</a> </span></div>
<div>UCL - Bât. Euler a.217 - Av. G. Lemaître 4-6 , <span style="text-align: -webkit-auto;">B-1348 Louvain-la-Neuve - </span><span style="text-align: -webkit-auto;">+32(0)10 47 23 64 </span></div>
<div><span style="text-align: -webkit-auto;">ULg - Institut Montefiore I154 - Allée de la Découverte 10, B-4000 Liège - +32(0)4 366 37 36 </span></div>
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<div>François Henrotte Dr Ir - <span style="text-align: -webkit-auto;"><a href="mailto:francois.henrotte@uclouvain.be">francois.henrotte@uclouvain.be</a></span><span style="text-align: -webkit-auto;"> - </span><span style="text-align: -webkit-auto;"><a href="mailto:francois.henrotte@uliege.be">francois.henrotte@uliege.be</a> </span></div>
<div>UCL - Bât. Euler a.217 - Av. G. Lemaître 4-6 , <span style="text-align: -webkit-auto;">B-1348 Louvain-la-Neuve - </span><span style="text-align: -webkit-auto;">+32(0)10 47 23 64 </span></div>
<div><span style="text-align: -webkit-auto;">ULg - Institut Montefiore I154 - Allée de la Découverte 10, B-4000 Liège - +32(0)4 366 37 36 </span></div>
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