Practical dividing line between a ductile and brittle materials is suggested...

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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. 3 times the thickness

C. Either A or B, whichever is larger

D. Either A or B, whichever is smaller

Answer: Option C

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