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高溫下 304 스테인리스鋼의 複數表面龜裂의 成長學動에 관한 實驗的 硏究
서창민(C. M. Suh),신형섭(H. S. Shin),황남성(N. S. Hwang),정대윤(D. Y. Jung) 한국해양공학회 1995 韓國海洋工學會誌 Vol.9 No.1
The crack which is discovered in various structures and machine elements is multi-cracks. Multi-cracks may cause serious problems because they grow individually, and coalesce into one and it leads to fracture.<br/> Fatigue tests have been carried out to study the growth and coalescence behavior of multi-surface-cracks initiated at the semicircular surface notch in type 304 stainless steel at elevated temperature.<br/> The results are as follows;<br/> When multi-surface-cracks are lying on the surface of material, the major surface crack has greater influence on the the fatigue life than the subcracks.<br/> The aspect ratio of multi-surface-cracks is lower than that of single crack because of the interaction and coalescence of surface cracks.<br/> Crack growth shape turns to semiellipse from the semicircle notch. After coalescence, the surface crack length increases rapidly, and it leads to fracture.<br/> Further, the slope transition of Paris law was found in the da/dN-ΔK₁ plots.
정대윤,박찬규,이상록 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.2
The procedure of prepared by lead chromate pigments is composed of precipitation reaction and aging. In this study, it was used particle surface treatment on feeding additives in aging time in order to maintain size and shape of particles. The input point of additives Al₂(SO_4)_3 was effective in size-increasing period. And the time for stable mean particle size was shorten by increasing feed rate of additives. The desired size of particles are manufactured by the control of input point, feeding amount, and feeding time of additives.