Hi to everyone,
I am trying to model contact between two rigid blocks of the same geometry. In the tangential direction a Coulomb friction behaviour is needed while in the normal direction a "hard
contact" should be applied; however, the standard surface-to-surface contact may not be applied for rigid bodies in Abaqus. Thus, I have tried, among others, the following connector section that connects with a wire the center of mass of both rigid bodies along the y-y global direction:
Cartesian connector with two behaviour options:
Direction u1 (along global x-x parallel to each surface in conta
ct) was specified as the slip direction and a value of the friction coefficient was implemented, e.g., 0.65.
A contact Force is also needed. I have defined that the contact Force is specified as F2, i.e., perpendicular to the slip surface and a value equivalent to the weigth of the upper block was implemented. Is this the right procedure? What happens in case of a more complex geometry? How we define this contact Force? The contact Force is also defined in the following option, also.
b) Elasticity: A non-linear Law for the contact Force along the U2 direction was applied to model hard contact as follows:
The above formulation suggests that the stiffness is infinite when contact occurs (I suppose that negative value is compression) and stifness becomes approximately zero at detachment.
A seismic excitation is applied along the global x-x direction (parallel to the contact surface) so as to provoke an acceleration greater than 0.65g in order to provoke slip, however the two blocks remain unseparable without slip.
Please provide your comm
ents or any advice regarding contact between rigid bodies.