I tried what you suggested, but I can't still simulate the springback process of the metal sheet plate. The plate got a little bit flatted down like the attach image
The above image I used Normal Lagrance, but when i tried to use other type of formulation, it still shows this error: "Solver pivot warnings or errors have been encountered during the solution. This is usually a result of an ill conditioned matrix possibly due to unreasonable material properties, an under constrained model, or contact related issues. Check results carefully."
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