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RBE2 Application

Dear All,

I want to ask about RBE2 application, please see my picture below.

I have a simple plate, and I want to give constraint on 2 holes on top, and forces (160kN on both hole or 80kN each hole) on 2 holes on bottom

Why my simulation result (stress & deformation) totally different?, because in my opinion, case on the problem 1 and problem 2 are same....

Am I miss something?

Best regards,

Iron_Man

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Rahul Rajan_21763

To me it should give different results.Point of load (distance)is varying.Any specific reason for using only specific nodes for creating RBE2/why not selecting all nodes of hole?

Altair Forum User

@Rahul R,

Thank you for your response, you said 'To me it should give different results.Point of load (distance)is varying' could you telling me more detail about it? or you have reference documents to understand about it?

'Any specific reason for using only specific nodes for creating RBE2/why not selecting all nodes of hole? '

I use RBE2 on half of hole to describe shaft contact area.

Thank you,

Altair Forum User

Hi @Iron_Man59

I think in second case you will see a moment around the SPC point and your displacement results will be huge compared to first one.

Instead leave SPCs as in case one and apply force/load as in case 2. Your results should match.

tinh

No no, I think it is due to another reason...

assume X is horizontal direction

in case 1, 2 holes with force can have X deformation

but in case 2, they are impossible. rbe2 is similar to a rigid bar which constrained x deformation. so result of 2 cases will be different. could you check case 2 deflection is lower than case 1?

SPC and Force are same, but structure stiffness are different

Altair Forum User

Dear All,

Thank you for your response,

@Prakash Pagadala,

'I think in second case you will see a moment around the SPC point and your displacement results will be huge compared to first one.'

No, the displacement on problem 1 is bigger than problem 2, please see my picture below.

'Instead leave SPCs as in case one and apply force/load as in case 2. Your results should match.'

What the problems that should be compared to your statement above? Problem 1 VS Your statement or Problem 2 VS Your statement?

@tinh,

'could you check case 2 deflection is lower than case 1?'

As what I mention above, YES, the displacement on problem is lower than problem 1

All,

Please see my actual problem below, maybe you could give better solution how to model it on hyperworks,

Thank you,

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Altair Forum User

Here are my three cases:

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Altair Forum User

@Prakash Pagadala,

I see that the result on problem 1 (left picture (biggest one)) is similar with the result on problem 2 (right picture(top)), my question, which is better to use?