During the past six years, a joint government-industry-sponsored project titled Ship Structural Maintenance Project (SMP) has been conducted at the University of California at Berkeley. As part of the SMP, fatigue of ship critical structural details (CSD) has been studied. This paper summarizes developments in the stress range—number of cycles to failure (SN) analysis developed during the SMP. Nominal stress and hot spot stress procedures were employed to evaluate fatigue damage to ship CSD. A “cracked SN curve” approach was developed based on a hybrid SN-FM (fracture mechanics) methodology to evaluate the residual life of cracked ship CSD. The fatigue durability characteristics of repaired CSD was studied. Numerical examples are presented to illustrate these developments.

Issue Section:
Research Papers
Topics:
Fatigue, Ships, Stress, Cycles, Durability, Failure, Fatigue damage, Fracture mechanics, Governments, Maintenance
1.
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15.
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17.
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18.
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19.
Xu, T., Paulling, J. R., and Bea, R. G., 1992, “Study of Critical Structural Details (CSD) in Tankers,” Research Report SMP 3-2, Department of Naval Architecture and Offshore Engineering, University of California at Berkeley, Berkeley, CA.
20.
Xu, T., and Bea, R. G., 1993a, “Fatigue Analysis of Critical Structural Details in a 150,000 DWT Double-Hull Tanker,” Research Report SMP II-1 Department of Naval Architecture and Offshore Engineering, University of California at Berkeley, Berkeley, CA.
21.
Xu, T., and Bea, R. G., 1993b, “Fatigue Analysis of Critical Structural Details in a 190,000 DWT Double-Bottom Tanker,” Research Report SMP II-2 Dept. of Naval Architecture and Offshore Engineering, University of California at Berkeley, Berkeley, CA.
22.
Xu, T., and Bea, R. G., 1993c, “CSD Library and Finite Element Analysis,” Research Report SMP II-3, Dept. of Naval Architecture and Offshore Engineering, University of California at Berkeley, Berkeley, CA.
23.
Xu, T., 1995, “Fatigue and Fracture of Critical Structural Details (CSD) in Tankers,” presented at the Northern California SNAME Section, Berkeley, CA.
24.
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25.
Xu, T., and Bea, R. G., 1995a, “Fitness for Purpose Analysis of Cracked Critical Structural Details (CSD) in Tankers Research,” Report SMP III-1 Dept. of Naval Architecture and Offshore Engineering, University of California at Berkeley, Berkeley, CA.
26.
Xu, T., and Bea, R. G., 1995b, “Fracture—A Computer Code for Crack Growth Analysis of Cracked Critical Structural Details (CSD) in Tankers,” Research Report SMP III-4 Department of Naval Architecture and Offshore Engineering, University of California at Berkeley, Berkeley, CA.
27.
Xu, T., and Bea, R. G., 1996a, “Load Shedding of Fatigue Fracture in Ship Structures,” accepted for publication in Journal of Marine Structures, Elsevier Science Publishers, UK.
28.
Xu, T., and Bea, R. G., 1996b, “Fatigue of Cracked Ship Critical Structural Details—Cracked SN Curves and Load Shedding,” 6th International Conference on Offshore and Polar Engineering, International Society of Offshore and Polar Engineers, Golden, CO.
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