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# How can I change friction coefficie

## How can I change friction coefficie

(OP)
How can I change friction coefficient in Abaqus for change in contact pressure, strain and sliding velocity? Does anybody experience with Vfric subroutine? I guess in Vfric it is possible to define a friction model as a function of slip rate and pressure only? How is it possible to define strain also?

### RE: How can I change friction coefficie

If you use Coulomb friction model you can set dependency of friction coefficient not only on the default variables (slip rate, pressure and temperature) but also some field variables:

*FRICTION, DEPENDENCIES=n
u, y, p, T, f

where: u - friction coefficient, y - slip rate, p - pressure, T - temperature, f - field variable.
Subroutines FRIC_COEF/VFRIC_COEF correspond to this model.

I think that you could use USDFLD (or VUSDFLD in Explicit) to relate this field variable to strain. However FRIC/VFRIC subroutine used when Coulomb model is not enough should also support the use of solution-dependent state variables.

### RE: How can I change friction coefficie

(OP)
Seems like a workable idea... I will give it a try thanks for your reply.

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