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Contact Surface Problem - No Contact

Contact Surface Problem - No Contact

Contact Surface Problem - No Contact

I am trying to simulate a forming process with a rigid punch and a deformable material.  I have defined a master/slave contact surface interaction with penalty friction attributes.  The problem, is that when I run the simulation results, the rigid punch does not contact the deformable body.  Instead, it passes through the body.  Has anyone had problems like this or no of something I may be doing wrong?

Thanks for the help,

RE: Contact Surface Problem - No Contact

Couple of things to check...

- Contact pairs defined correctly with *CONTACT PAIR keyword.  This is defined as model data in Standard, step data in Explicit.  Having said that, if your model is 3D Explicit, you can use the *CONTACT general contact method.

- Check the normal directions of the surfaces.  You can do this in Viewer (Common Option I think).  The surface normals must 'point' to each other.

- You can check the status of the contact pairs by adding *PRINT, CONTACT=YES in the step definition.  Youu can then check the .dat file for information about whether the surfaces are initially opened or overclosed.



RE: Contact Surface Problem - No Contact

You can have situation where initially the two surfaces have passed each other. This is due to some error in the geometry you might not perceive. Set up initial contact conditions so that overclosed nodes are brought back to be initially in contact.


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