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Which are the best parameters for steel to steel contact? I have a wheel contacted with a rail.The impact function its being used, with normal force: F=k*z^2.1+c*dz/dt. What value of stiffness k should i put?
There is not a simple answer to your question.
The general guidance is to reduce penetration between components as much as is reasonable, without making the stiffness so high that is results in computation difficulties. Sometimes you need to try different types of normal force calculation, sometimes it's the parameters themselves.
In our help section, please read careful the section on Best practices for 3D contacts. Your wheel geometry does not have a uniform mesh, which is important for accurate contact forces. Just search the help for 'Best Practices for Running 3D Contact Models in MotionSolve'. There is a lot of important material there, that will save you a lot of time and headache if you will follows those best practices in setting up your problem.
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