Optimal Inspection Planning for Fatigue Damage of Offshore Structures

by H. O. Madsen, Danish Engineering Acad, Denmark,
J. D. Sorensen, Danish Engineering Acad, Denmark,
R. Olesen, Danish Engineering Acad, Denmark,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


A formulation of optimal design, inspection and maintenance against damage caused by fatigue crack growth is formulated. A stochastic model for fatigue crack growth based on linear elastic fracture mechanics is applied. Failure is defined by crack growth beyond a critical crack size. The failure probability and associated sensitivity factors are computed by first-order reliability methods. Inspection reliability is included through a pod (probability of detection) curve. Optimization variables are structural design parameters, inspection times and qualities. The total expected cost of design, inspection, repair and failure is minimized with a constraint on the life time reliability.

Subject Headings: Offshore structures | Failure analysis | Inspection | Fatigue (material) | Damage (structural) | Stochastic processes | Structural analysis | Cracking

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