How to model a clearance fit?

Wiz211
Wiz211 Altair Community Member
edited October 2020 in Community Q&A

Hello,

 

I have a problem regarding a clearance fit.

I already checked the eBook 'Practical Aspects of Finite Element Simulation' but could not find anything helpful.

 

My thesis is about a structural analysis of a CubeSat satellite inside of a Deployer Case.

So I have the model of the satellite and the case. In space the Deployer Case will open up and a spring inside kicks out the satellite.

 

Former attempts to model the connection between both models failed because analysis results have been unrealistic.

I used RBE2 elements (all 6 dofs constrained) on both contact surfaces and connected them with a rigid CBUSH element. I just realised how wrong that is.

 

 

My new idea for a realistic clearance fit is to keep the RBE2 elements (6 dof constrained) at the case, replace the RBE2 elements on the satellite by RBE3 elements (only 1 dof constrained in normal direction) and connect them with a rigid (CBUSH).

 

 

Is my new idea also false?

Do you have any idea how to model a clearance fit between satellite and case according to the pictures attached?

 

<?xml version="1.0" encoding="UTF-8"?>Seperation_Dynamics.PNG

<?xml version="1.0" encoding="UTF-8"?>CubeSat_Inserted.PNG

<?xml version="1.0" encoding="UTF-8"?>Former_Attempt_(False).PNG

<?xml version="1.0" encoding="UTF-8"?>CubeSat_Case.PNG

<?xml version="1.0" encoding="UTF-8"?>3U_CubeSat.PNG

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Answers

  • Rahul Rajan_21763
    Rahul Rajan_21763 New Altair Community Member
    edited August 2019

    Can you try by constraining only first three dof for RBE2 element.

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