The damping ratio, used in quasi-static problems, such as sheet forming, stamping, forging, is that role, b, shown in the following equation
Ma+bCv=P-F
For the problems mentioned above, the value of b is about 0.1. if dynamic explicit method is employed, the simulation may encounters steady problem, while convergence problem for implicit method employed. I think, you can search some articles on damping in sheet metal forming, then you will understand the effect of this damping ratio.
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