Someone please can help me to solve the following problem. which i need to submit Monday........ Thanks In advance. A thin walled pressure vessel is to be used as a pressure accumulator in a number of situations all involving a number of different operating conditions some of which create cyclic stresses. The dimensions of the vessel are 600mm long (not including end caps) and a shell outside diameter of 60mm. The material which the vessel is made from is pressure vessel steel with a yield 510MPa. a Failure stress 630MPa and an Endurance stress of 400MPa. Static stressing has shown that the vessel is safe for all the stress situations proposed and it must now be determined if the vessel is safe fatigue failure for the two following situations. 1. If the vessel is subject to cyclic pressure of 0 and 400 bar determine the minimum shell thickness of vessel to give infinite life. 2. If the vessel is subject to a cyclic pressure of 50 to 600 bar determine the minimum shell thickness of the vessel to give infinite life.