Question: Punching a circular hole 80 mm in diameter through a 0.9 mm thick sheet of metal with a simple flat-ended punch requires a maximum force

Punching a circular hole 80 mm in diameter through a 0.9 mm thick sheet of metal with a simple flat-ended punch requires a maximum force of 50,000 N. Assuming the material follows Equation 2.8 - Stress, = K*^n (K =400, n = 0.17) and the process follows Equation 16.1 - F = 0.7*T*L*S_ut, what is the UTS and what strain does the UTS occur at during the punching operation?

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