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?

Question

Accepted Answer

Either A. or B., whichever is larger. The knuckle radius should be less than the larger value between 6% of the Inner Diameter (I.D.) and three times the thickness.