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how to model crack in comsol with contact pair??

Posted Feb 10, 2011, 8:53 a.m. EST Geometry, Modeling Tools & Definitions, Parameters, Variables, & Functions, Structural Mechanics Version 3.5a, Version 4.1, Version 4.2 4 Replies

Deepak
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Hi,

I made a crack in plate with ellipsoid on surface,but i am not able to create a contact pair at the crack interface.
pls help!!

Thanks!!

Deepak
4 Replies Last Post Aug 26, 2011, 7:48 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 10, 2011, 2:54 p.m. EST
Hi

I'm not sure a "contact pair" is the easiest physics to apply for crack propagation, as a contact pair is a BC tht is free in one directionand compressive in the other, while a crack has some adhesion until you pass a limit (of rupture) and then it passes the (mostly pulling) stress further "down the line". There is an example with a crack propagation in the 3.5 examples, perhaps not yet in the v4, will certainly arrive soon, try an upodate of the mdoel library

--
Good luck
Ivar
Hi I'm not sure a "contact pair" is the easiest physics to apply for crack propagation, as a contact pair is a BC tht is free in one directionand compressive in the other, while a crack has some adhesion until you pass a limit (of rupture) and then it passes the (mostly pulling) stress further "down the line". There is an example with a crack propagation in the 3.5 examples, perhaps not yet in the v4, will certainly arrive soon, try an upodate of the mdoel library -- Good luck Ivar
Ramgopal Balijepalli
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Posted: 1 decade ago Apr 7, 2011, 9:32 a.m. EDT
Hello Ivar,

I am dealing with a similar problem. In my case two surfaces are adhered strongly and I would like to model the crack propagation in the contact area of the two surfaces when a tensile force is applied to the non adhering surface. I searched in the model library but haven't found any information in this regard except the example suggested by you.

Any suggestions or help would be highly appreciated.

Best Regards,
Ramgopal
Hello Ivar, I am dealing with a similar problem. In my case two surfaces are adhered strongly and I would like to model the crack propagation in the contact area of the two surfaces when a tensile force is applied to the non adhering surface. I searched in the model library but haven't found any information in this regard except the example suggested by you. Any suggestions or help would be highly appreciated. Best Regards, Ramgopal
Aaron Quastel
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Posted: 1 decade ago Aug 25, 2011, 11:12 a.m. EDT
Have you found anything on this, such as applying the j-integral?
Have you found anything on this, such as applying the j-integral?
Ramgopal Balijepalli
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Posted: 1 decade ago Aug 26, 2011, 7:48 a.m. EDT
Unfortunately I haven't found anything till now..
Unfortunately I haven't found anything till now..

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