## General Mechanical

#### Calculation for stability and deformation

• javat33489
Subscriber

Hi all.

When considering sustainability.

• The first calculation is static,
• then the data is transferred to the stability calculation module
• in the third step, the data from the stability module is transferred again to the static module for verification.

Tell me plase. If at the first stage there were two parts (one inside and one outside), one part was not affected, then it is not transferred to the stability module and then it cannot be used further in the calculations. I need this part to stay further, so that after I get the deformed inner part, I can load it again and it interacts with the second outer part. For example, these are two pipes, one inside the other. I check the inner tube for stability, compress it. Then I get a deformed state after the stability modulus and I want to squeeze it again so that it starts touching the outer tube. How to leave both details in all calculations? I used the outer pipe as a rigid body, maybe this is the problem?

• peteroznewman
Subscriber

In your first sentence, I think you mean stability, not sustainability. It's better to use the terms Ansys uses, which is Eigenvalue Buckling.

It seems simple to change the outer pipe to flexible to see if that fixes your problem. Do that and let us know.

• javat33489
Subscriber

Yes, I made two bodies deformable and both pipes appeared as I wanted. But now I have new problems. I divided them into two sections.

1. I pass the deformed value of the inner tube from the buckling module to the static analysis to load it and it bends inside the outer tube like a string and rests against the walls of the outer tube. But when I load the inner tube, nothing happens even more than the loss of stabilization, the tube simply shrinks along the axis. Although I transferred the deformed state of the pipe with static analysis. Here are the screenshots

2. Then I tried to make the inner tube shrink inside the other tube like a string, I pressed it in the middle against the other tube, and then pressed along the axis. But here's the problem, there is no contact between the pipes, they pass through each other. I tried all the methods including touch control, also I changed the pinball radius, nothing helps. Here are the screenshots

I have attached the project for the second problem.

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