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**naba****Member**- Registered: 2018-03-05
- Posts: 4

I want to create a friction model in code aster which is later connected in series with SDOF system. The governing equation for the friction model is

F = m.g.2/pi.arctan(ud/c)

where,

F = force

m= mass

g = acceleration of gravity

ud= velocity

c = reference velocity (constant)

Furthermore, the equation of motion of the total system after connecting it with SDOF system when excited by ground acceleration (uddg) becomes,

m.udd + cs. ud + ks. u + m.g.2/pi.arctan(ud/c) = -m.uddg

where,

udd = acceleration

cs = damping

ks = stiffness

u = displacement

. represents multiplication.

Any ideas, examples and suggestions are welcome. Please help..

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**dbpatankar****Member**- From: Roorkee, Uttarakhand, India
- Registered: 2010-05-22
- Posts: 191

When you have the governing differential equation and its a SDOF system, why dont you just use an appropriate time marching scheme and solve it?

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**naba****Member**- Registered: 2018-03-05
- Posts: 4

Thank you so much for the reply. But I'm sorry for not being clear to my question. I've already made a program to solve the model itself exactly according to your suggestion and it is working perfectly.

So to the addition of my previous question, ultimately I want to combine 'Coulomb Friction' model with 3D FEM model. In that case, having a (discrete) element of such model would be a great advantage. I'm just wondering if I can develop such element in code aster or not.

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