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1. A pressure vessel has a diameter of 2.2 m and a wall thickness of 15 mm. During routine inspection it is discovered that there is a crack 6 mm deep on the outside surface of the cylinder. The steel used in the vessel is known to be tough and a C.O.D. test on a sample gives the following results: Sample Width, B = 30 mm Sample depth, W = 50 mm Crack Length, a = 25mm Vp = 0.3 mm Fc = 70kN z = 2 mm Calculate the maximum internal pressure to which the vessel could be subjected. E = 207 GN/m², oy = 500 MN/m², v = 0.3. a/W 0.45 0.46 0.47 0.48 0.49 0.5 0.51 0.52 0.53 0.54 0.55 fi(a/W) 9.1 9.37 9.66 9.96 10.28 10.61 10.96 11.33 11.71 12.12 12.55 f(a/w) 8.34 8.57 8.81 9.06 9.32 9.6 9.9 10.21 10.54 10.89 11.26