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If the effective flow stress for extrusion is 100 MPa and the extrusion ratio is 4, then find the ideal extrusion pressure for the process?

If the effective flow stress for extrusion is 100 MPa and the extrusion ratio is 4, then find the ideal extrusion pressure for the process? Correct Answer 138.6 MPa

The ideal extrusion pressure is defined as: -> P=kA*ln(Ai/Af) -> Ai/Af = extrusion ratio = 4 -> kA = effective flow stress = 100 MPa -> P=100 ln(4) -> P=100*1.386=138.6 MPa So, the ideal extrusion pressure is equal to 138.6 MPa.

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