How can I change friction coefficie 1

[dine_k03]

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?

 

[FEA way]

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.

 

[dine_k03]

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