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Stress in steel sleeve assembled with a pressure fit on a steel shaft.

Boris_22428

Hello Everybody !

I need to check the stress in steel sleeve (tube) assembled with a pressure fit on a steel shaft.

Can I do it with linear static ?

(I saw a video on YouTube with quasi-static load step and very complex SPCs that I did not understand)

Can you please prompt me a best way, any tutorial or video ?

Thanks a Lot !

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OptiStruct

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Adriano_Koga

hi @Boris

You need to run NL Quais-Static analysis for this.

You can do this 2 wyas:

1) checking only the press-fit, and letting the solver "remove" the penetration in the contact

2) running the insertion from the beginning, calculating all the steps.

There are a few models attached, that i hope might be helpful, for option 1).

If you want to run #2, then LGDISP and CONSLI Contact should be used, with a well discretized mesh.

If you're not familiar to OS NL analysis, i recommend you to go through the Altair University training materials first.

SPC/SPCD define the enforced displacement for the solver.

For a SPCD 2.0 in Z direction, you need to add also a SPC 0.0 in the same DOF.

clearance_5neg.fem

clearance_5neg_rotation.fem

All comments

Adriano_Koga

hi @Boris

You need to run NL Quais-Static analysis for this.

You can do this 2 wyas:

1) checking only the press-fit, and letting the solver "remove" the penetration in the contact

2) running the insertion from the beginning, calculating all the steps.

There are a few models attached, that i hope might be helpful, for option 1).

If you want to run #2, then LGDISP and CONSLI Contact should be used, with a well discretized mesh.

If you're not familiar to OS NL analysis, i recommend you to go through the Altair University training materials first.

SPC/SPCD define the enforced displacement for the solver.

For a SPCD 2.0 in Z direction, you need to add also a SPC 0.0 in the same DOF.

clearance_5neg.fem

clearance_5neg_rotation.fem

Boris_22428

Dear Adriano

Thank you very much for your reply and for attached models (I just have run them) !

is the difference between them - only the SPC thru the RB at z direction ?

The clearance -5 in contact is the press fit of 5 mm on radius (and 10 mm on diameter ?)

I did a couple examples from OptiStruct tutorials, but of cause I need to learn more..

Your examples are of way 1 ? can you please give some more tips for each way ?

Thanks a lot !

Boris

Adriano_Koga

Dear Adriano

Thank you very much for your reply and for attached models (I just have run them) !

is the difference between them - only the SPC thru the RB at z direction ?

The clearance -5 in contact is the press fit of 5 mm on radius (and 10 mm on diameter ?)

I did a couple examples from OptiStruct tutorials, but of cause I need to learn more..

Your examples are of way 1 ? can you please give some more tips for each way ?

Thanks a lot !

Boris

one of them is just a static cylinder subjected to the press-fit, already inserted. I've added the negatice clearance to numerically impose the value of penetration in this model, independently on the mesh distance. Correct, -5mm in radius (10mm total).

The second one, name rotation, I've applied also a rotation in the rotation dof, by using the SPC, and imposing some angle of rotation (value in radians).

Boris_22428

hi @Boris

You need to run NL Quais-Static analysis for this.

You can do this 2 wyas:

1) checking only the press-fit, and letting the solver "remove" the penetration in the contact

2) running the insertion from the beginning, calculating all the steps.

There are a few models attached, that i hope might be helpful, for option 1).

If you want to run #2, then LGDISP and CONSLI Contact should be used, with a well discretized mesh.

If you're not familiar to OS NL analysis, i recommend you to go through the Altair University training materials first.

SPC/SPCD define the enforced displacement for the solver.

For a SPCD 2.0 in Z direction, you need to add also a SPC 0.0 in the same DOF.

Dear Adriano

I have a pressure sleeve that secures glued magnets on the rotor.

I know how to find the stress with RFORCE. Now I need to combine RFORCE with Press fit (to check the effect of safety sleeve on magnet's glue stress )

I tried to base on these files, you kindly shared here, (with IR4NLCON - inertia relief for nonlinear), But there was no convergence.. just errors..

Will be grateful for any tips !

Thank You and Best Regards

Boris