3538 重ね継手の疲労寿命に及ぼす超音波ピーニングの影響のFLARPによる解析(S14-4 FLARPによる疲労き裂発生伝播シミュレーション(4),S14 FLARPによる疲労き裂発生伝播シミュレーション)
詳細
Effects of ultrasonic peening on fatigue life of pad welded joint were analyzed by fatigue life analysis method by RPG load. It's noted that the ultrasonic peening is one of the most effective method for improving fatigue life of welded joint. Ultrasonic Impact Treatment, UIT was adopted in this study as the ultrasonic peening method. A significant increase in fatigue life was observed on the pad welded joint with UIT treated weld toe. The improvement was estimated mainly due to compressive residual stress introducing, stress concentration reducing and grain refining in weld toe area. Estimated fatigue life by FLARP was consistent with experimental result.
