Stochastic Fatigue Damage Accumulation Due to Nonlinear Ship Loads

[+] Author and Article Information
Alok K. Jha

Risk Management Solutions, Inc., Menlo Park, CA 94025e-mail: alokj@riskinc.com

Steven R. Winterstein

Civil and Environmental Engineering Department, Stanford University, Stanford, CA 94305-4020e-mail: Steven.Winterstein@stanford.edu

J. Offshore Mech. Arct. Eng 122(4), 253-259 (Jun 20, 2000) (7 pages) doi:10.1115/1.1315303 History: Received September 01, 1998; Revised June 20, 2000
Copyright © 2000 by ASME
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Model of monohull ship that will be analyzed using strip theory
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Linear transfer function for midship bending moment response
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Partial wave and response histories at midship
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Comparison of fatigue damage from linear and nonlinear analysis for sag, hog, and range bending moments
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Comparison of simulated wave heights to Forristall and to Rayleigh distributions
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Simulated wave period versus modified Longuet-Higgins wave period
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Wave heights and periods for the 30 waves used in the NTF model
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Damage prediction from response to 30 selected sinusoidal waves. The single-wave cycle responses are used in this prediction.
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Construction of wave triplet for NTF load prediction
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Relation of side wave height to middle wave height
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Damage prediction from the response to 30 selected waves as in Fig. 8. Here the side waves have been assigned as “consistent triplets” rather than the regular sinusoids assigned in Fig. 8.
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Sag damage prediction from NTF method with 30 triplet waves compared to linear prediction and exact damage
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Hog damage prediction from NTF method with 30 triplet waves compared to linear prediction and exact damage
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Wave parameters (from quadrature) of the 15 waves in NTF model. (Note the largest period for the smallest height is not shown, to facilitate comparison with Fig. 7.)
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Damage prediction from response to selected waves with side waves; 15 wave triplets have been used in the fatigue prediction
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Improvement of NTF prediction for sag damage by including scatter effects



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