Good morning,
I’m doing some tests with the K coefficient of ‘‘surface interaction’’. I would like to know:
1-What does it mean exactly?;
2-How does the variation of that coefficient affect the contact surface, for example its increment?
Thank you.
It’s a slope of the pressure-overclosure curve (basically contact stiffness). You can find the description in CalculiX’s documentation: http://www.dhondt.de/ccx_2.20.pdf
Thank you for the answer. But how does it work if I have a tied contact? I mean, if it’s tied, that K says only how ‘‘elastic’’ is the contact surface, isn’t it?
Here’s a quote from CalculiX’s documentation:
The tied pressure-overclosure behavior simulates a truly linear relationship between the pressure and the overclosure for positive and negative pressures. At zero overclosure the pressure is zero. It can only be used for face-to-face penalty contact and similates tied contact between the slave and master face. Notice that all slave faces will be tied to opposite master faces, if any, irrespective whether there is a gap between them or not. The only parameter is the slope of the pressure-overclosure relationship.
K is basically the stiffness of the spring element forming contact element:
