United States Department of Transportation
i
Fatigue Resistant Detail Design Guide for Ship Structures
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1999-08-01
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[PDF-3.41 MB]
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Edition:Final Report
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Abstract:This Guide is a result of a 1995 Ship Structures Committee Symposium in Washington, at which it was recognized that practicing naval architects required help in applying fatigue design research and development results. This Guide consolidates the state-of-the-art in ship structural detail fatigue design. The information in the Guide is presented in four sections, starting with an overview of the fatigue design problem and related issues. The second section includes a catalogue of typical structural details for commercial and combatant ship types, with suggested structural improvements for fatigue life extension. This, along with a brief discussion of fabrication issues, represents the “Level 1” approach to ship structure fatigue design. The third section of the report presents analytical procedures for fatigue based design of structural details. Load, stress and fatigue analysis procedures are presented at two levels of complexity, “Level 2” and “Level 3”. The simplified Level 2 approach makes use of Classification Society rules and analytical methods, whereas, the spectral Level 3 approach explicitly considers vessel operational profiles and wave climates in statistical load estimation and makes use of FE models for stress analysis. Both the Level 2 and 3 approaches are based on a “hot spot” stress approach using Miner’s rule in either a discrete or continuous form. The final section of the Guide provides worked fatigue design examples to demonstrate the concepts presented in the previous sections.
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