Equation (26) should read
which causes the friction power losses to be slightly larger than presented in the paper.
Gordon, , W. A., Van Tyne, and , C. J., and Sriram, S. (July 8, 2004). "Extrusion Through Spherical Dies—An Upper Bound Analysis [ASME Journal of Manufacturing Science and Engineering, 124, pp. 92–97] ." ASME. J. Manuf. Sci. Eng. May 2004; 126(2): 412. https://doi.org/10.1115/1.1767840
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