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Contact algorithm

masa
1-Newbie

Contact algorithm

Dear Sir/Madam,

There is a couple of questions and I appreciate if someone give any advice. We are now trying to handle a contact problem between spheres.

First question is what kinds of algorithm is used in Creo simulate. Some possibilities are Lagrange multiplier or penalty methods I guess and I wanna know this to make my numerical analysis by Creo be more reliable.

Second is how to defined master and slave relation.

Please advice me if you know any information. Thanks!

Best,

Masa


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1 ACCEPTED SOLUTION

Accepted Solutions
346gnu
11-Garnet
(To:masa)

Masa,

A partial answer perhaps

Simulate uses the penalty method and solution by Newton-Raphson reducing residual enery to zero (small number). I'm not sure if it's 'Pure penalty' or Augmented Lagrange. It would seem sensible if it were augmented as this is less sensitive to normal stiffness.

By slave and master do you mean source and target contact surfaces as in Ansys? I think surface-surface and 'symmetric' is used as it more general than node-node and doesn't require a compatible mesh.

Regards

Charles

View solution in original post

2 REPLIES 2
346gnu
11-Garnet
(To:masa)

Masa,

A partial answer perhaps

Simulate uses the penalty method and solution by Newton-Raphson reducing residual enery to zero (small number). I'm not sure if it's 'Pure penalty' or Augmented Lagrange. It would seem sensible if it were augmented as this is less sensitive to normal stiffness.

By slave and master do you mean source and target contact surfaces as in Ansys? I think surface-surface and 'symmetric' is used as it more general than node-node and doesn't require a compatible mesh.

Regards

Charles

View solution in original post

masa
1-Newbie
(To:346gnu)

Charles,

Thanks for your reply.

It is very helpful to know that Simulate uses the penalty method and that's engouh for me.

About slave and master one, I don't mean the case like Anysis. Your advise, such as suface-surface and symmetric is common, is usefuls comment.

Thanks again!

Best,

Masa

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