Q4. The table below (Table Q4) provides yield stress (ay) and plane strain fracture toughness (KIC) values for a high carbon steel and a titanium alloy respectively. Table Q4-Selected material properties for a high carbon steel and a titanium alloy Material High Carbon Steel Titanium Alloy ay (MPa) 1,350 750 KIC (MPa√√m) 83 120 (a) Calculate the failure stress for a centre crack in a large plate made from each of the two materials under plane strain conditions using linear elastic fracture mechanics with plastic zone correction when they each contain the following centre cracks: (i) High carbon steel: (ii) Titanium alloy: 0.01 m 0.20 m