高周波加熱真空圧延接合Al/SUS STJの強度(その2) : 十字隅肉溶接継手の破壊強度解析

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Tanks of a spherical tank type LNG carrier are supported by cylindrical shells by the name of "skirt". On the one hand aluminum (Al) alloy (A5083) is used for the upper part of this skirt, on the other hand stainless steel (SUS) is used for the lower part. In this case, because Al and SUS are not able to be welded directly, therefore Al/SUS STJ (S__-tructural T__-ransition J__-oint) is used to connect these two kinds of materials. Recently, at Nagasaki Research & Development Center, Mitsubishi Heavy Industries, Ltd., the vacuum roll bonding method for producing the new-type Al/SUS STJ industrially is developed and investigated instead of clad material produced by explosive welding method. In the first report, tension tests were performed by using round bar specimens and cruciform welded joint specimens, as a results of these tests, this new-type Al/SUS STJ had enough joint strength, and this STJ was certified to be practicable for the tank skirt part of a spherical tank type LNG carrier. In this report, in order to investigate the fracture strength and breaking type of this new-type STJ in more detail, three-dimensional elastoplastic FEM analysis was performed. As a result of the investigations described above, the following conclusions were obtained: (1) Plastic deformation of Al alloy part just on the faying surface is restrained by SUS having the higher strength and rigidity because Al and SUS are bonded directly, therefore very high axial stress and hydrostatic stress occurred on this Al alloy part of the Al/SUS STJ produced by vacuum roll bonding method. (2) This new-type Al/SUS STJ can show the enough strength, because all kinds of fractures are able to occur only after the Al alloy part just on the faying surface is deformed sufficiently.
社団法人日本船舶海洋工学会の論文
2001-08-31

高周波加熱真空圧延接合Al/SUS STJの強度(その2) : 十字隅肉溶接継手の破壊強度解析

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