CONSIDERATION OF LOADS FOR FATIGUE ASSESSMENT OF SHIP STRUCTURES

Technical issues associated with loads obtained for the purpose of fatigue assessment are discussed in this paper. The topic of discussion is focused specifically on spectral fatigue analysis and linear elastic fracture mechanics based crack-growth analysis. In order for the frequency domain formulation and the associated probability analysis to be valid, load analysis presented in this paper is largely limited to be linear. Some nonlinear features that should also be taken into consideration in the process of fatigue assessment are also discussed. This includes nonlinear roll motion and nonlinearity brought forth by intermittent application of loads, such as wetting of side shell in the splash zone by waves. The discussion emphasizes the dominant loads relevant to particular regions of the ship structure, as well as the eventual constitution of the set of loading. A simple, linear rule for load combination is proposed.

• Corporate Authors:

  National Research Council, Marine Board

  2101 Constitution Avenue, NW
  Washington, DC  United States  20418
• Authors:
  • Chen, Y N
  • Shin, Y S
• Conference:
  • Symposium and Workshop on the Prevention of Fracture in Ship Structure
  • Location: Washington, D.C.
  • Date: 1995-3-30 to 1995-3-31
• Publication Date: 1997

Language

• English

Media Info

• Features: Figures; References;
• Pagination: p. 367-395

Subject/Index Terms

• TRT Terms: Fracture mechanics; Loads; Mechanical fatigue; Ships
• Uncontrolled Terms: Crack growth
• Subject Areas: Design; Marine Transportation; Materials; Vehicles and Equipment;

Filing Info

• Accession Number: 00763190
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: May 4 1999 12:00AM