Question: ( b ) A ( 1 0 - mathrm { mm } ) steel drill rod was heat - treated and ground.

(b) A \(10-\mathrm{mm}\) steel drill rod was heat-treated and ground. The measured hardness was found to be 300 Brinell. Using a reliability of 95 percent, estimate the endurance strength in MPa if the rod is used in rotating bending.
( b ) A \ ( 1 0 - \ mathrm { mm } \ ) steel drill

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