Generaliced Plain Strain in a thin-wall tube: Results and constraints?

Eugenio

I want to model the case of 2D GPS analysis for the section of a tube of 10 meter large with a thin thickness between the inner and the outer walls. The tube is free to expand along its length (z axis)but x and y displacement should be 0 (consideration that can’t be bend=rigid). I want to verify GPS conditions (strain in z axis=constant and Force in z axis=0N)for being sure that i'm doing a GPS analysis.

What I've already done is:

1) Insert a thermal condition in the tube with an external data file (I have coordinates x,y and the temperature).

2)Create a remote point which links the inner and de outer wall.

3) Insert: remote displacement (x=0 y=0 rotation=0 behaviour=deformable).

4)Insert: Generalized Plain Strain (boundary condition=free, Rotation x=Rotation y=0).

With this configuration I have not a constant strain (normal elastic strain differs from being constant). If someone could help me trying to figure out where I have the problem I would be very grateful.

Thank you.🙏

akhemka

Hi, @Eugenio ,

Please check the following 2 links that should help:

https://www.youtube.com/watch?v=zTkS1Co9Sms

https://www.digitalengineering247.com/article/simplifying-fea-models-plane-stress-and-plane-strain/

Regards,

Ashish Khemka

Eugenio

Thanks Ashish Khemka for your answer but the problem is that i'm not trying to model as a Plain Strain or Plain Strees.

What I want is to model the tube seccion in 2D as a Generaliced Plain Strain. The case is almost the same of the youtube video but letting the tube to move in the axial direction (z axis in the image uploaded). (I upload the image for more clarity).

Thanks.