I am trying to simulate the movement of wheel on rail to determine contact stresses on rail. But the Contact forces on rail are varying too much over the course of translation. Resulting graphs of CFNM vs step time is attached.
stomach feeling considering the graph: timestep of the calculation maybe not sufficient small enough...?
Andreas Näßl Thanks for your opinion.
I think you are right.. I selected 0.2 sec as the step time considering the velocity and distance with which I wanted to simulate the movement of wheel on the rail.
Can you tell me how to estimate critical step time size?
Well, that depends on the dynamic characteristics of your problem and the solver type. If you use something like newmark-beta, i would go ahead with a timestep of at least 1/10 of the period of the highest significant frequency content in the system's response (something that you have to figure out a priori....). and using some explicit solver types you might need a much higher sampling.
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