Pipe pressure load with analytical field and hydrostatic pressure

[otaviobarodrigues]

Hello,

I am simulating the internal and external pressures in a tube. For this purpose, in my simulation, I am using the PIPE31 element and a loading type called PIPE PRESSURE.

In this type of loading, it is possible to define a distribution using an analytical field and specify a mathematical expression for the internal and external pressures. I defined the expression: ((-1.53389668863437*Z)*6894.75728).

For some reason, when I do this, the SF1 forces are not remaining constant as they should (Job-5.inp).





When I change the loading to a hydrostatic distribution, the result matches the expected outcome (Job-3.inp).



Has anyone encountered this issue and could help me, please?

 

[FEA way]

Check the output variable ESF1. It's the effective axial section force taking internal and external pressure loading into account. Also, do you have the analytical expression field selected as the distribution of the pipe pressure load ?