文章基本信息

标题：ブラスト処理による溶接止端部の疲労強度向上効果の検証
本地全文：下载
作者：藤井壽裕 ; 岡田公一 ; 出口純一等
期刊名称：日本船舶海洋工学会論文集
印刷版ISSN：1880-3717
电子版ISSN：1881-1760
出版年度：2021
卷号：33
页码：97-106
DOI：10.2534/jjasnaoe.33.97
语种：Japanese
出版社：社団法人日本船舶海洋工学会
摘要：Recently, the strength of the hull structure including fatigue strength has seen significant improvement because of application of IACS CSR (Common Structural Rules). Various methods which can increase the fatigue strength at welded joints are suggested, since the damage morphology on the recently welded structures was observed to be primarily fatigue failure. In Shipbuilding industry, smoothening of the welding bead toe by grinding is the method that is customarily adopted to improve the fatigue performance. Recently, many peening treatment methods at the welding bead has also been proposed. These peening processes produce a compressive residual stress field near the peening location. In addition, the peening process smoothes the toe shape of the weld bead and reduces stress concentration. In case of generating compressive residual stress by impact, the same effect could be expected by shot blasting, which is the steel surface preparation for painting.In this study, the condition of the residual stress generated at welding toe by shot blasting was investigated, and then from results of the fatigue test, the increase in fatigue strength due to residual stress is verified. In addition, referring to the S-N curve based on the fatigue test results, the effect of the fatigue strength improvement effect due to blasting on the fatigue design of the hull structure was investigated, and the possibility of hull weight reduction was confirmed.