A methodology for calculating the correlation factors to combine the long-term dynamic stress components of ship structure from various loads in seas is presented. The proposed methodology is valid for a stationary ergodic narrow-banded Gaussian process. The total combined stress in short-term sea states is expressed by linear summation of the component stresses with the corresponding combination factors. This expression is proven to be mathematically exact when applied to a single random sea. The long-term total stress is similarly expressed by linear summation of component stresses with appropriate combination factors. The stress components considered here are due to wave-induced vertical bending moment, wave-induced horizontal bending moment, external wave pressure, and internal tank pressure. For application, the stress combination factors are calculated for longitudinal stiffeners in midship cargo and ballast tanks of a crude oil tanker. It is found that the combination factors strongly depend on wave heading and period in the short-term sea states. It is also found that the combination factors are not sensitive to the selected probability of exceedance level of the stress in the long-term sense.
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Stress Combination for Fatigue Analysis of Ship Structures
Alexander J. Fyfe
Alexander J. Fyfe
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Yung S. Shin
Booki Kim
Alexander J. Fyfe
J. Offshore Mech. Arct. Eng. May 2005, 127(2): 175-181 (7 pages)
Published Online: December 22, 2004
Article history
Received:
June 4, 2004
Revised:
December 22, 2004
Citation
Shin, Y. S., Kim, B., and Fyfe, A. J. (December 22, 2004). "Stress Combination for Fatigue Analysis of Ship Structures." ASME. J. Offshore Mech. Arct. Eng. May 2005; 127(2): 175–181. https://doi.org/10.1115/1.1924399
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