A cylindrical pressure vessel of 2 m radius and 0.05 m wall thickness is manufactured from a steel with of 700 MPa and fracture toughness of 90 MPa m1/2. The internal pressure of the vessel during operation is expected to reach 0.75 MPa. Before the component is installed, a non-destructive testing (NDT) contractor reveals a flaw of depth 17 mm. Assess if the component is safe to be used. Use the ‘Plate in tension - through-thickness edge crack’ geometry in the K-calculator. You will need to calculate the hoop stress in the wall of the pressure vessel, assuming it to be a thin-walled cylinder. (6 marks) A safety-conscious engineer orders the flaw to be repaired. After repairing, NDT reveals that welding has introduced a new flaw, 6 mm in depth. It is assumed that as a result of welding, the residual stress in the region of the flaw is close to the yield strength of the steel. Will the vessel be safe to use in this situation? Explain how you come to your conclusion.
A cylindrical pressure vessel of 2 m radius and 0.05 m wall thickness is manufactured from a steel with of 700 MPa and fracture toughness of 90 MPa m1/2. The internal pressure of the vessel during operation is expected to reach 0.75 MPa. Before the component is installed, a non-destructive testing (NDT) contractor reveals a flaw of depth 17 mm.
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Assess if the component is safe to be used. Use the ‘Plate in tension - through-thickness edge crack’ geometry in the K-calculator. You will need to calculate the hoop stress in the wall of the pressure vessel, assuming it to be a thin-walled cylinder.
(6 marks)
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A safety-conscious engineer orders the flaw to be repaired. After repairing, NDT reveals that welding has introduced a new flaw, 6 mm in depth. It is assumed that as a result of welding, the residual stress in the region of the flaw is close to the yield strength of the steel. Will the vessel be safe to use in this situation? Explain how you come to your conclusion.
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