Application of Mechanics in Design

Exam #$2$ Sample

Problem $2(35$ Points$)$

A rectangular bar is cut from an AISI $1020$ cold$-$drawn steel flat. The bar is $2\mathrm{.}5$ in wide by $3/8$in$.$ thick and has a $0\mathrm{.}5-$in$-$ dia. hole drilled through the center as depicted. The bar is concentrically loaded in push$-$pull fatigue by axial forces F$=4\mathrm{.}2$ kip. Determine the fatigue factor of safety if an infinite life is expected.