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- W164000173 abstract "Publisher Summary There are six US-designed FFG-7 class of guided missile frigates in service with Royal Australian Navy (RAN). All ships in the FFG-7 Class have experienced some form of superstructure cracking. Of particular concern is a transverse, welded butt joint in the necked, midship region. The combination of relatively poor weld quality, weld alignment of longitudinal and deck butt joint, high overall nominal stress at the knuckle, and stress concentration has lead to the initiation of fatigue cracks in aluminum. Investigations by the United States Navy and subsequently by the Royal Australian Navy using modeling and sea trials lead to the introduction of various fixes. All the proposals put forward basically involved adding varied amounts of new structure with aim to increase the section modulus of the superstructure, especially in areas of high stress concentration. Design changes accepted by both navies involved the introduction of a larger radius at the superstructure knuckle in conjunction with thick plate inserts in areas of high stresses. The research work conducted at Defense Science Technology Organization (DSTO) involved extensive development of materials and processes since no appropriate codes or standards were available. The only guidelines were DSTO staff experiences with “crack patching” and adhesive bonding for aerospace applications, manufacturers data sheets, and the RN experiences with composite reinforcement of Type 21 ships." @default.
- W164000173 created "2016-06-24" @default.
- W164000173 creator A5060715767 @default.
- W164000173 date "2002-01-01" @default.
- W164000173 modified "2023-09-27" @default.
- W164000173 title "Case HistoryBonded Composite Reinforcement of Ship Structures" @default.
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- W164000173 doi "https://doi.org/10.1016/b978-008042699-0/50044-9" @default.
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