Question $4$

$($a$)$ A steel wrench $($The radius of wrench is $12$ mm$)$ is fixed to the ground as shown in Figure Q$4.$ If a perpendicular force $298$N

is applied to the handle, calculate and define the corresponding values in $($i$),($ii$),($iii$)$ of point

A and B $.$

$($i$)$ The principal stresses and the corresponding principal planes,

$($ii$)$ The maximum in$-$plane shearing stress and its orientation,

$($iii$)$ The corresponding normal stress in part $($ii$).$

$($b$)$ Sketch the orientation of the element $($which represent the stress state of point B$)$ under the

condition of $($a$)($i$)$ and $($a$)($ii$),($iii$).$

$***$Two separated sketches should be prepared.

$($c$)$ Present the result of point B in Mohr's Circle