Study of the nondestructive inspection frequency based on structural reliability considerations

Abstract To ensure the safety and reliability of mechanical components and structures, in-service nondestructive inspection (NDI) is frequently employed in the aircraft, petrochemical, nuclear and non-nuclear power and other industries. In the present paper, the effect of NDI on structural reliability is studied within the context of probabilistic fracture mechanics. Special attention is given to the investigation of optimal in-service nondestructive inspection frequency based on structural reliability considerations. Using the proposed analytical method, an appropriate in-service inspection (ISI) schedule can be planned. This ISI plan gives the least maintenance cost while retaining minimally required reliability assurance for the structure.