プラズマ切断部の大気中・海水中疲労強度に関する検討(その2)

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In the previous paper, the following conclusions were obtained as the results of the fatigue tests of plasma arc cut steel plate in air and in artificial sea water conducted using three types of steel plates having the same strength as 490MPa-class high tensile steel plate. ・The fatigue strength in air is decreased by 10 through 17% owing to plasma arc cutting. ・High performance of restraint from growing austenite grain and high hardenability are effective to improvement of the fatigue strength of plasma arc cut steel plate. ・There is not clear difference in the fatigue strength in artificial sea water among three types of steel plates having almost the same chemical composition. In this paper, adding two types of steel plates having the same strength as 490MPa-class high tensile steel plate newly, the fatigue strength of plasma arc and gas cut steel plates in air and in artificial sea water were examined. As a result of the investigations described above, the following conclusions were obtained: (1) Compared with machined steel plates, the fatigue strength of all of the five steel plates in air is remarkably decreased owing to plasma arc cutting. Those fatigue strength reduction rate is 11 through 22%. (2) Even beveled and polished at under corner of the cut section, an increase in the fatigue strength of plasma arc cut steel plate in air is only 5%. (3) The fatigue strength of plasma arc cut steel plates in artificial sea water is decreased by about 17% in comparison with machined plates.
社団法人日本船舶海洋工学会の論文
2001-03-12

プラズマ切断部の大気中・海水中疲労強度に関する検討(その2)

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