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contact modeling problem

Posted 2009年8月25日 GMT-4 22:50 5 Replies

Manohara Mariyappa
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Hi everyone

I ve been working on a contact problem in which there are 2 concentric cylinders . the cylinders are not in contact initially but the inner cylinder expands and comes in contact with the outer cylinder. comsol solves the problem but there is penetration. I dont know whats wrong . I would really appreciate any comments.
Thank you,
Manohar
5 Replies Last Post 2014年1月3日 GMT-5 09:59
Geoff Young
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Posted: 1 decade ago 2009年9月1日 GMT-4 12:01
Did you set your contact pairs?
Did you set your contact pairs?
John Tam
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Posted: 1 decade ago 2009年9月1日 GMT-4 12:18
Hi Manohar,

I have been working on a similar problem like yours, which I have 2 objects that will expand due to temperature changes. previously someone has provided me with the following link of an example in contact problems, you may start with this one to gain more understanding.

www.comsol.com/showroom/gallery/1431/

Frankly, I still have errors in my problem and keep on trying; so maybe we can keep each other posted if any of us makes some discoveries.

John Tam
Hi Manohar, I have been working on a similar problem like yours, which I have 2 objects that will expand due to temperature changes. previously someone has provided me with the following link of an example in contact problems, you may start with this one to gain more understanding. http://www.comsol.com/showroom/gallery/1431/ Frankly, I still have errors in my problem and keep on trying; so maybe we can keep each other posted if any of us makes some discoveries. John Tam
Manohara Mariyappa
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Posted: 1 decade ago 2009年10月28日 GMT-4 22:28
Yeah I am quite sure my contact definition is set right . I still don't know whats wrong.
Yeah I am quite sure my contact definition is set right . I still don't know whats wrong.
Saurabh Mittal
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Posted: 1 decade ago 2013年12月31日 GMT-5 03:41
Although Comsol is a fantastic software for multiphysics, it does not handle contact problems properly, and I moved over to Abaqus for contact problems.
Although Comsol is a fantastic software for multiphysics, it does not handle contact problems properly, and I moved over to Abaqus for contact problems.
Henrik Sönnerlind COMSOL Employee

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Posted: 1 decade ago 2014年1月3日 GMT-5 09:59
Hi,

COMSOL is continuously improving its contact algorithms and they have gone through many revisions since these original postings in 2009. The latest version, 4.4, has additional contact methods. See www.comsol.com/release/4.4#structural for more information. We have no reports of problems with uncontrolled penetration with mechanical contact. Contact simulations can sometimes be challenging and we recommend that you contact technical support for help with specific models.

See also the Knowledgebase articles www.comsol.com/support/knowledgebase/1102/ and www.comsol.com/support/knowledgebase/1171/ .

Some models showing how to perform contact analysis:

www.comsol.com/model/cylinder-roller-in-contact-a-benchmark-study-1431
www.comsol.com/model/contact-analysis-of-a-snap-hook-using-a-penalty-formulation-12577
www.comsol.com/model/prestressed-bolts-in-a-tube-connection-185
www.comsol.com/model/sliding-wedge-364

You can also analyze true multihysics contact problems as described in the section 'Thermal Contact Resistance' in www.comsol.com/heat-transfer-module, or in the model www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119

Regards,
Henrik

Hi, COMSOL is continuously improving its contact algorithms and they have gone through many revisions since these original postings in 2009. The latest version, 4.4, has additional contact methods. See http://www.comsol.com/release/4.4#structural for more information. We have no reports of problems with uncontrolled penetration with mechanical contact. Contact simulations can sometimes be challenging and we recommend that you contact technical support for help with specific models. See also the Knowledgebase articles http://www.comsol.com/support/knowledgebase/1102/ and http://www.comsol.com/support/knowledgebase/1171/ . Some models showing how to perform contact analysis: http://www.comsol.com/model/cylinder-roller-in-contact-a-benchmark-study-1431 http://www.comsol.com/model/contact-analysis-of-a-snap-hook-using-a-penalty-formulation-12577 http://www.comsol.com/model/prestressed-bolts-in-a-tube-connection-185 http://www.comsol.com/model/sliding-wedge-364 You can also analyze true multihysics contact problems as described in the section 'Thermal Contact Resistance' in http://www.comsol.com/heat-transfer-module, or in the model http://www.comsol.com/model/simulation-of-multiphysics-contact-in-a-power-conductor-4119 Regards, Henrik

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