Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?

A. 6% of I.D.

B. Either A. or B., whichever is smaller

C. 3 times the thickness

D. Either A. or B., whichever is larger
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