The part shown is loaded at point C with $28bN$ in the positive $x$ direction and at point $t$ with $18UN$ in the positive $y$ direction. The dlameter of the bar ABD is $12mm.$ Evaluate the likelihood of fallure in section $AB.$

NUIE: Inis is a muiti$-$part question. unce an answer is submitteo, you wil be unable to return to this part.

For the critical stress element, determine the three principal stresses and the maximum shear stress. $($Note: Please enter only positlve numbers in the answer box.$)$

The three princlpal stresses and the maximum shear stress are as follows:

${}_1=,$MPa

${}_2=,$MPa

${}_3=-,$MPa

${}_{\text{m}\text{a}\text{x}}=,$MPa