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J. Ocean Eng. Technol. 2000;14(1):29-36.    

A Study on the Analysis of Cycle Ratio Using Fractal Dimension in Al 2024-T3
프랙탈 차원을 이용항 AL 2024-T3 합금의 피로수명비 해석에 관한 연구
조석수
삼척대학교 자동차공학과
© 2000 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Fractal dimension, coast line method, Etreme statistics, Scale length, Surface micro-crack, Cycle ratio
핵심용어: 프랙탈 차원, 해안선 방법, 극치통계, 스케일 길이, 표면미소균일, 피로수명비
Abstract
Surface micro-crack grows along intergranular or transgranular region of crystal grains. But if it meets the barrier such as sessile dislocation and precipitates it loses straightness and deflects. Investigators had many difficulties in estimating fatigue life of smooth specimen because of the random distribution growth and coalescence of surface micro-cracks. The path of surface micro-crack has irregularity due to nonhomogeneous microstructure. Euclidian geometry can't quantify the shape of surface micro-crack but fractal geometry can. Therefore in this paper fractal dimension is measured at various stage of cycle ratio and estimated cycle ratio in 2024-T3 aluminium, alloy.


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