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쇼트피이닝가공 스프링강의 압축잔류응력이 피로균열진전거동에 미치는 영향
박경동(Keyoung-Dong Park),장찬기(Chan-Gi Jung) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
The lightness of components required in automobile and machinery industry is requiring high strength of components. In particular, manufacturing process and new materials development for solving the fatigue fracture problem attendant upon high strength of suspension of automobile arc actively advanced. In this paper, the effect of compressive residual stress of spring steel(JISG SUP-9) by shot-peening on fatigue crack growth characteristics in high temperatures(100℃, 150℃, 180℃) was investigated with considering fracture mechanics. So, we can obtain followings.<br/> (1)Compressive residual stress is decreased in high temperature. that is, with increasing temperature.<br/> (2)The effect of compressive residual stress on fatigue crack growth behavior in high temperature is increased below ΔK=17~19MPa√m<br/> (3)The dependence of temperature and compressive residual stress on the parameters C and m in Paris' law formed the formulas such as equations (3),(4),(5),(6).<br/> (4)It was investigated by SEM that the constraint of compress residual stress for plastic zone of fatigue crack tip was decreased in high temperature as compared with room temperature.