Q$\mathrm{.}2.$ For the notched rectangular plate shown

a$.$ What should be the minimum thickness of the plate in order to prevent failure?

Take the safety factor as $2\mathrm{.}5$ and yield strength $(S_y)$ of the steel alloy as $570$ MPa $.$

b$.$ Calculate the fatigue stress concentration factor at the notch location.

Take the ultimate tensile strength $(S_{ut})$ of the steel alloy as $700$ MPa $.$

tension or simple compression.

${}_0=\frac{F}{A},$ where $A=dt$ and $t$ is

the thickness.

Figure $6-26$

Notch$-$sensitivity charts for steels

and UNS A$92024-$T wrought

aluminum alloys subjected to

reversed bending or reversed

axial loads. For larger notch

radii, use the values of $q$

corresponding to the $r=0\mathrm{.}16-in$

$(4mm)$ ordinate. Source: Sines,

George and Waisman, J$.$ L$.$

$($eds$.),$ Meal Fatigue,

MoGraw$-$Hill, New York, $1969.$