アルミニウム合金製浮沈式生簀の損傷事故解析

概要

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A new type fish preserve made of A5052 aluminum alloy, which enable to rise and fall on sea level, was seriously damaged in one-year proof test period. Because this accident had happened within unexpected short period, investigation was carried out to clarify the cause. SEM observations identified that fatigue fracture generated from boxing fillet welded toes in joint elements of the fish preserve was a main cause of this accident. To estimate the fatigue life of original joint elements and modified ones to improve fatigue strength, the relationship between peak stress ranges at boxing welded toe in both original and modified joint elements and wave heights in service had investigated. This result shows that the original joint elements had a considerable shortage of fatigue strength and that the modified ones have few possibilities to generate similar accidents.
社団法人日本船舶海洋工学会の論文
2002-03-20