Learning Forum

[Eleonora Vezzani]

Hello!

I have implemented a simple double clamped beam model with elements BEAM188. My goal would be to obtain the the maximum von Mises strain evolution in time of in the section of one of the clamped ends. To do so, I am using a mode superposition transient analysis, defining different load steps. Now, I obtain reasonable values for the deflection evolution in time, but both Von Mises strains and stress are identically null. Does anybody know which commands should I include in the APDL code to obtain this data?

Thank you in advance!

[Erik Kostson]

 

Hi

Assume you use MAPDL and that at least one end is fully fixed (so dx=dy=dz=rotx=roty=rotz=0).

See all the commands here (especially /eshape,1, outres,all,all and PLNSOL, S,EQV):

Please see the Ansys Help, Verification Manual, VM217 “Portal Frame Under Symmetric Loading”

All the best

Erik

 

 

[Eleonora Vezzani]

Hi!

Thank you for the suggestions and the quick reply, but also using the outres,all,all command I still have this result in post26:

I already looked into VM217, but the only indication that I get is to save the bending moment for each time instant and then use the usual formulas to derive the strain/stress, and even in that case everything is done in post1. I hoped that there would be a quicker way, and that you can provide me some useful indications. 

Thank you in advance!

Eleonora

[Erik Kostson]

 

 

 

In post1 /eshape and set,last,last and PLNSOL, S,EQV etc., results are OK.

So in Post1, you can see all of the section results at once. In Post26, this is not possible. You can get the direct stress and the 4 section extreme stresses using ETABLE: (SMISC,…SDir, SByB,etc.) and then find the maxima (see beam188 in help manual for the SMISC and the Sdir stresses) – so similar to what you said and suspected.

See here for the above (smisc,etc.):

/forum/forums/topic/can-you-get-element-table-data-for-von-mises-stress-with-element-beam188/

 

All the best

Erik