question_answer

For calculating the blank diameter D for thin cylindrical shell of outer diameter d and with height of the shall h, which one of the following formulae is used when d 220r, where r is the comer radius on the punch?

A) \[D=\sqrt{{{d}^{2}}+4d{{h}^{2}}}\]

B) \[D=\sqrt{{{d}^{2}}+4dh-0.5r}\]

C) \[D=\sqrt{{{d}^{2}}+4dh-r}\]

D) \[D=\sqrt{{{d}^{2}}+4dh-1.5r}\]