INU1127 (24/25) Knowledge Check: Principal Stresses and Failure Criteria

At a point on an aluminium structure 𝜎 𝑥 𝑥 = 75 𝑀 𝑃 𝑎 , 𝜎 𝑦 𝑦 = − 35 𝑀 𝑃 𝑎  and 𝜏 𝑥 𝑦 = 20 𝑀 𝑃 𝑎 . For this stress field, determine the factor of safety according to: (a) the Tre...