爆発圧着接合型5層Al/SUS STJの強度

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Tanks of a spherical tank type LNG carrier are supported by the cylindrical shells by the name of "skirt". On the one hand aluminum (Al) alloy having good low temperature properties is used for the upper part of this skirt, on the other hand stainless steel (SUS) having low thermal conductivity 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 (Al and SUS). Until now, a four-layers (Al/Ti/Ni/SUS) clad material (Al/SUS STJ) produced by the explosive welding method is used for LNG carrier. Recently, a five-layers (Al/Al/Ti/Ni/SUS) Al/SUS STJ is produced as an experiment by improving the conventional four-layers Al/SUS STJ. In this paper, in order to quantify the fracture strength of this five-layers Al/SUS STJ, a series of round bar tension tests and cruciform welded joint tension tests were performed. As a result of the investigations described above, the following conclusions were obtained: (1) The fracture strength of the faying surfaces of the five-layers Al/SUS STJ used for the tests is more than the tensile strength of A3003-O (R.T.: about 110N/mm^2, -165℃: about 145N/mm^2). (2) The faying surfaces of the five-layers Al/SUS STJ used for the tests have the about 3.6 times strength safety factor at -165℃ compared with the overestimated design stress for the skirt of the spherical tank type LNG carrier. (3) The five-layers Al/SUS STJ used for tests is certified to be practicable for the tank skirt part of a spherical tank type LNG carrier from the viewpoint of the fracture strength.
社団法人日本船舶海洋工学会の論文
2002-03-20

爆発圧着接合型5層Al/SUS STJの強度

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