The Fatigue Strength Assessment For Hull Structures Of42m Trawler

China, as one of the biggest traditional fishing countries, is also a more developedfishery country in the world, which has a fairly large number of all kinds of fishing vessels.particularly in the situation of facing the over exploitation of coastal fishery resources andseriously needing to update the most domestic overage used steel fishing vessels in thecurrent global, studying and building advanced steel fishing vessel of our own country,catering to the trend for the development of ocean fishery, which will make greatsignificance to promote the development of national fishing vessels, and related industriesof fishing vessels etc.Compared with the traditional common merchant ships, such as bulk carriers, steeltrawler have significant difference in the structure, such as the stronger horizontal structure,the relatively weaker vertical structure and with no significant vertical structures on thetransverse cross section, in terms of the new design of large-scale pelagic steel fishingvessels, the large and complex of hull structures makes the structural performance becomemore concern. the problem about fatigue strength of steel fishing vessel may become muchprominent as the requirements of the hull structure with large scale, therefore, it isnecessary to consider the fatigue strength assessment for hull structures of steel fishingvessel, but there are no specific regulatory requirements as well as fatigue guides, somedesign departments consult the specification of other large merchant ships for design andmanufacture for part of new design fishing vessel. Consequently, studies on the fatigueproblems of steel fishing vessel about hull structure and the fatigue strength assessment ofits sensitive parts, which will make great practical significance in the design andconstruction of new pelagic steel fishing vessels in the future.Accordance with an ordinary steel trawler, analysis the process of the entire shipstructure modeling, structural strength and fatigue loads calculating, together with fatiguestrength assessment, investigate the structure characteristics of fishing vessels from theaspect of the fatigue assessment, provide some scientific guidance or technical reference forformulating and improvment the scrapping fishing vessels or related specifications; andpropose some main factors affecting vessel fatigue strength and effective measures toimprove fatigue performance, guide and optimize the structural design for the larger scaleand more complex structures pelagic steel fishing vessels.