A metal disk with a diameter of 75 mm and a thickness of 15 mm was compressed between frictionless plates, while another identical disk was compressed between rough plates. The measured forces (press loads) at the time of starting the flow were 126 ton and 158 ton, for the first and second disk, respectively. Assuming homogeneous deformation, determine the coefficient of friction for the rough plates.

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Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.