Learning Forum

[reinhardt]

Hello! I have a doubt about how to perform the stress linearization analysis for a pressure vessel modeled as a shell body like the one shown in the figure.

The objective is to see the variation of the linearized stresses in this area, where the maximum stresses occur.

Greetings!

[Wenlong]

Hi,

In Mechanical, you can create a "path" by right click on "Model" -->insert--> "Construction Geometry" --> "Path. For that path, you can choose one point on the inside of the tank, the other point on the outside of the tank. 

After you create the path, you can request "linearized stress" and plot the stress on the path you just created. 

Regards,

Wenlong

 

[reinhardt]

Hi Wenlong, thanks for the answer!

The steps you mentioned I could apply but for the case where the geometry has a thickness in space, like here.

Now, for this case in which I have the same geometry defined  by surfaces, is there any way to define the linearized stresses?

Or the only way to get those stresses is to edit the shell geometry to get it to a solid with thin walls and from there, define the paths as you said before?

Greetings!

[Wenlong]

Hi,

Thanks for the explanation and sorry I didn't catch your meaning correctly. 

I did a quick test and it does work for shells as well. When you choose the two nodes on the path, you can consider the shell thickness, making one node on one side, and the other node on the other side. 

Regards,

Wenlong

 

[reinhardt]

Hi Wenlong!,

Again, thanks for your answer!

I've got one last question: when I use shell elements, the linearized stresses (membrane, bending, membrane + bending, peak) are obtained through Scope /  Position in the details of Equivalent Stress? And if that were true, to what tension does each position correspond?

Greetings!

[Wenlong]

Hi,

It is obtained by right click on "Solution" --> insert--> Linearized stress --> Equivalent stress. As you can see from the result plot in the previous post, the stress value in all three positions (top, bot, middle) can be reflected. Please let me know if this answers your question. 

Regards,

Wenlong

 

---

Useful Links

---

• How to show full resolution image

 

 

[reinhardt]

 Hi Wenlong,

Indeed, thank your for the information and your help.

Greetings!