Fatigue crack propagation and computational remaining life assessment of ship structures |
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Authors: | Y Sumi |
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Institution: | (1) Department of Naval Architecture and Ocean Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, 240-850 Yokohama, Japan |
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Abstract: | The fitness for serviceability of structural members of marine structures in which fatigue cracks might be found during in-service
inspection is investigated in order to prevent instantaneous failures of ships, as well as a loss of serviceability such as
the oil- and/or watertightness of critical compartments. The essential features of fatigue crack propagation and the remaining
life assessment are discussed in the first part of the paper, where the effects of weldment, complicated stress distributions
including stress biaxialities at three-dimensional structural joints, structural redundancy, and crack curving are found to
be of primary importance. The second part of the paper contains a discussion of an advanced numerical simulation method for
the remaining life assessment, in which the above-mentioned effects of fatigue crack propagation are taken into account. The
simulated crack paths and the fatigue crack propagation lives are found to be in fairly good agreement with the experimental
results. |
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Keywords: | ship structures fatigue crack propagation remaining life assessment computer simulation welding residual stress structural redundancy blaxial stress crack curving |
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