Abstract
The characteristics of Fatigue Damage Sensors(FDS) that are in use for fatigue life estimation of monitoring structural members in ship structures are discussed in order to improve prediction accuracy of estimated fatigue life exposed to random wave loads such as storms under various loading conditions peculiar to ship structures. Coefficients affected by loading histories against constant amplitude loading and mean stress levels are introduced for the estimation procedure using FDSs and confirmed by several series of fatigue testing. This newly proposed fatigue life estimation procedure using obtained coefficients is checked by comparison results of application to a marine structure on which FDSs and strain gauges are provided simultaneously and to which random loads by varying wave are applied.
