Question: A copper ingot is compressed between two anvils. If the yield strength (sigma_{y}) of copper is (80 mathrm{MPa}) and the coefficient of friction (mu) at

A copper ingot is compressed between two anvils. If the yield strength $\sigma_{y}$ of copper is $80 \mathrm{MPa}$ and the coefficient of friction $\mu$ at the interface between the copper and the anvil is 0.1 , what is the maximum forming pressure at the centre of the ingot when the aspect ratio $2 w / h$ is $20: 1$ ?

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