Problem $2$

Consider a single crystal metal oriented such that the normal to the slip plane and the slip

direction are $\backslash$phi $=40\mathrm{.}9\backslash$deg and $\backslash$lambda $=48\mathrm{.}4\backslash$deg with the tensile axis. If the critical resolved shear stress is

$\backslash$tau $\_($CRSS$)=23$MPa, determine the minimum stress $\backslash$sigma $\_($Y$)$ above which the material will yield.