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자동차엔진 경량화용 금속기 복합재료의 피로균열진전거동에 관한 연구
정재욱(Jaewook Jung),최용범(Yongbum Choi),박원조(Wonjo Park),허선철(Sunchul Huh),이광영(Kwangyoung Lee) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
Metal matrix composites had generated a lot of interest in recent times because of significant in specific properties. It was also highlighted as the materials of frontier industIy because strength, heat-resistant, corrosion-resistant, wear-resistant were superiored.<br/> In this study Fatiuge crack growth behavior tests on compact tension specimen(haIf-size) of thickness I2.5mm were conducted by using sinusoidal waveform. Compact tension specimens (half-size) were used and fatigue crack growth behavior daJdN and stress intensity factor range L1 K were analyzed concerning to the R value of 0.1 and 0.05. In order to find out the value ΔK, load amplitude constant method was applied by the standard fatigue testing method describes in ASTM E647-95a As the results of this study, Fatigue crack growth behavior increased with in creasing the load ratio, Consequently, Fatigue life was observed roughly in the order of AC4CH> nobiner> Si0₂, independently on crack propagation direction and stress ratio.