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Penetration problem in Abaqus

I have been trying to model the penetration of a thin metal plate by a flat cylindrical bullet in ABAQUS. The plate has been treated as a membrane, and I am using Johnson-Cook's damage model in conjunction with Johnson-Cook hardening. The bullet is deforming the plate and travelling to the opposite side of the plate. But the dent is becoming infinitely long, but not showing any signs of ductile failure. What could have probably gone worng?

make sure you have used correct material properties

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