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gmarjason1-Visitor
1-Visitor
March 15, 2016
Question

Cyclic Symmetry, Pressure Loads on assembly

  • March 15, 2016
  • 2 replies
  • 1407 views

Hi,

I am running Creo 3 Simulate, we are trying to determine the stress within the walls of a pressure vessel assembly from external pressure, but using cyclic symmetry to speed up the process.

The model runs ok and the analysis completes, but the result is always far beyond the material yield turning the model red, this happens even if the external pressure load is very low, say around 100psi, the material yield is 130ksi, the walls are more than capable of with standing this pressure, normal operating pressure would be 10kpsi.


Thanks


Geoff.



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2 replies

U
unickque1-Visitor
1-Visitor
March 15, 2016

Geoff, can you share your model so we can have a look at it?

M
mlindqvist1-Visitor
1-Visitor
March 15, 2016

Seems like a unit error... I see also that you have sharp reentrant corners, you may end up with non-converging high stresses in those locations. This is where the linearized stress query can be used with some norm, for dimensioning.

U
unickque1-Visitor
1-Visitor
March 15, 2016

Might also be incorrect constraints; it looks as if there are deformations perpendicular to the symmetry planes near the sharp corners. And that long thin red artefact in the right top seems odd as well.

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