Development of optimum treatment method in the fatigue strength improvement

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560996
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Naval and maritime engineering
• Research Institution: National Maritime Research Institute
• Principal Investigator: ANAI Yosuke 独立行政法人海上技術安全研究所, その他部局等, 研究員 (60470051)
• Co-Investigator(Kenkyū-buntansha): NIWA Toshio 独立行政法人海上技術安全研究所, 構造基盤技術系, グループ長 (10208267) ; IWATA Toshiaki 独立行政法人海上技術安全研究所, 構造基盤技術系, グループ長 (50358397) ; TANAKA Yoshihisa 独立行政法人海上技術安全研究所, 構造基盤技術系, 主任研究員 (70399517)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 疲労 / 溶接継手 / 強度改善 / 板厚効果 / 超音波ピーニング

Outline of Final Research Achievements

For more rational and economical design and building of the welded structures, it is important to clarify the effect of improving the fatigue strength by the post weld treatment at the weld toe.
In this study, we aimed at the ultrasonic peening which is one of the High Frequency Mechanical Impact treatments. And we carried out 4-point bending fatigue tests of fillet T-joint whose weld toes were peened by the Ultrasonic Peening. From results of the fatigue test, we evaluated the improvement effect of the fatigue strength by Ultrasonic peening and examined the influence for the thickness effect under cyclic bending load.

Free Research Field

工学