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*SURFACE BEHAVIOR

Keyword type: model definition, surface interaction

With this option the surface behavior of a surface interaction can be defined. The surface behavior is required for any contact analysis. There is one required parameter PRESSURE-OVERCLOSURE. It can take the value EXPONENTIAL or LINEAR.

The exponential pressure-overclosure behavior takes the form in Figure 90. The parameters $ c_0$ and $ p_0$ define the kind of contact. $ p_0$ is the contact pressure at zero distance, $ c_0$ is the distance from the master surface at which the pressure is decreased to 1 % of $ p_0$. The behavior in between is exponential. A large value of $ c_0$ leads to soft contact, a small value to hard contact.

The linear pressure-overclosure behavior (Figure 91) simulates a linear relationship between the pressure and the overclosure. At zero overclosure the pressure is zero as well. The user has to specify the slope of the pressure-overclosure curve and can specify a tension value for large clearances (should be small).


First line:

Following line if PRESSURE-OVERCLOSURE=EXPONENTIAL:

Following line if PRESSURE-OVERCLOSURE=LINEAR: 

Example:

*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=EXPONENTIAL
1.e-4,.1

defines a distance of $ 10^{-4}$ length units at which the contact pressure is .001 pressure units, whereas the contact pressure at loose contact is 0.1 pressure units.


Example files: contact1, contact2.

next up previous contents
Next: *SURFACE INTERACTION Up: Input deck format Previous: *SURFACE   Contents
guido dhondt 2011-03-26