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- 저자 : 하경준(Kyungjun Ha) (검색결과 1 건)
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자동차용 SUP-9 스프링강의 파괴인성치에 미치는 압축잔류응력의 영향
정재욱(Jaewook Jung),박원조(Wonjo Park),허선철(Sunchul HUh),이광영(Kwangyoung Lee),하경준(Kyungjun Ha) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, the steel parts used at the aerospace and automobile industries are required to be used light weight parts. Therefor, used material, steel have to be a high stress, which is an indispensable condition in this field. At the consideration of parts design, high hardness of the lightweight parts have an benefit of saving fuel and material. A high stress of metal has a point of difference according to the shape of design, external cyclic load and condition of vibration. A crack generates on the surface of metal or under yield stress by defect of inner metal defect or surface defect and slowly, this crack grow stable growth. Finally, rapidity failure phenomena is happen. Fatigue failure phenomena, which happen in metal, bring on danger in human life and property. therefor, antifatigue failure technology take an important part of current industries Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefor, this paper investigated the effect on frcature toughness using shot peening which is improve the resistance of crack growth and crack expansion rate by fatigue that make a compressive residual stress on surface.<br/>
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