Abstract
The purpose of this study is to clarify a random loading model for fatigue strength analysis of ship structural members, and to examine fatigue crack growth behavior under the above random loading condition. We analyzed data collected from 38 ships that sailed in the North Pacific and 11 ships in the Japan-Indian Ocean over a period of 14 years; and 6 naval ships in the North Pacific near Japan. The main points are as follows 1. 1) the distribution function of long-term wave-induced load and stress can be described by the Weibull distribution function, with an expected shape parameter value close to unit; 2. 2) the time history of wave conditions during service sailing can be divided into two types—calm sea condition and various storm conditions. These two kinds of conditions appear in random order; 3. 3) based on the above results, a random loading model—‘storm model’ for the fatigue design of a ship is proposed. Then, welded joints simulating side longitudinals of ship structural member were tested under constant and storm loading model. Fatigue crack growth behavior such as crack growth rate, retardation phenomenon etc. were examined.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
