Research on simplified fatigue strength calculation method for longitudinal frame nodes of aluminum alloy high speed craft
Certain areas of high-speed crafts are prone to appear fatigue damage during their operational lifespan.The simplified calculation methods of the fatigue strength proposed by various classification societies are aimed at conventional vessel types and are not fully applicable to high-speed crafts.Therefore,it is necessary to conduct relevant research.This art-icle combines fatigue rules and load calculation applying to high-speed crafts,using finite element analysis for stress calcula-tion.When calculating the number of load cycles,the influence of the sailing speed is considered.Fatigue analysis of high-speed craft longitudinal frame nodes is conducted by integrating factors such as calculation conditions,exceedance probabil-ity levels and fatigue tests.Taking a specific real craft as an example,calculations were performed and compared with the normative values from a stress perspective,proposing a reasonable simplified fatigue strength calculation method.The res-ults show that this method is a rational improvement over the original specifications tailored for high-speed craft types.The fatigue check nodes of the target craft meet the requirements for design service life.The adoption of this simplified fatigue calculation method is practically significant for the structural design of aluminum alloy high-speed crafts.
万方数据
维普
