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부식환경하에서 쇼트피닝 가공에 의한 Al 7075-T6의 피로특성
이국진(Kookjin Lee),이동선(Dongsun Lee),정성균(Seongkun Cheong) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Corrosion fatigue life of a metal is greatly affected by the surface state of the metal. The shot peening process is know to have excellent effects on the fatigue life of parts by increasing the parts' resistance to corrosion. In this paper, the improvement of durability of shot peened Al 7075- T6 is studied under corrosive environment. Specimens were submerged in 3.5% NaCl from one week to two years before fatigue testing. It is attempted to estimate the peening layer in shot peened Al 7075 by ultrasonic velocity, such as leaky surface acoustic wave(LSAW). The fractured surface is examined by scanning electron microscope (SEM). The experimental results show that the corrosion fatigue resistance of Al 7075-T6 is greatly improved by shot peening process.
최적 피닝강도 탐색을 통한 자동차용 기어강재의 피로특성에 관한 연구
남지헌(Jihun Nam),김태형(Taehyung Kim),이국진(Kookjin Lee),이동선(Dongsun Lee),정성균(Seongkyun Cheong) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the optimum peening intensity (Almen intensity) condition is investigated by experiment. Rotary bending fatigue test has been adopted to investigate the effects of optimum peening condition on the fatigue characteristics. TheSCM420H steel was used to investigate shot peening effects. The fatigue life at σa=95O and σa= 1,050MPa first gently increases, then drops gently as peening intensity increases compared with unpeened specimen. Experimental results shlow that the optimum peening intensity range is 0.325~0.381 mmA. So the fatigue strength and fatigue life have been tremendously increased by optimum-peening treatment. However, the fatigue strength and fatigue life have been decreased by over peeing.