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A steel bar of the initial diameter of 20 mm is extruded with extrusion ratio of 8. Find the final diameter of the bar?

A steel bar of the initial diameter of 20 mm is extruded with extrusion ratio of 8. Find the final diameter of the bar? Correct Answer 7 mm

The extrusion ratio is defined as; -> R=Initial area/final area -> R=π D02/π Df2 -> R=D02/Df2 -> 8=(20)2/Df2 -> Df2=50 -> Df=√50 = 7.071 mm The final diameter of the bar will be 7.017 mm.

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