Axisymmetric Pressure Load 1

[John1988]

Hi,
I am modelling an axisymmetric cylinder. (I am modelling 1/2 the cylinder)

Should I apply the total pressure load that the piper experiences in real life or divide it by two?

Any help would be appreciated.

 

[FEA way]

You should apply the total pressure in such case.

 

[John1988]

Further to this... my model is actually cyclic symmetric, I model 1/5th the cylinder. (I simplified it to axisymmetric)

I apply the total pressure to the inner surface of the 1/5 model.

Question 1) is this still correct to apply total pressure for a cyclic symmetric model?

Question 2) I also apply an axial stretch load to the end of the cylinder. Should I divide this load by 5 or not?

Thanks for your help.

 

[Mustaine3]

Pressure is per area, so yes, you apply the full value.

With a force you only apply the fraction when using cyclic or plane symmetry. But the full value when doing axisymmetric analysis, since everything is seen as 360° model.

 

[FEA way]

In such cases it’s best to perform a simple test and check whether the results of the full and cyclic symmetry model are the same.