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현경수,현창해,김귀식,오맹종 濟州大學校工科大學産業技術硏究所 1995 尖端技術硏究所論文集 Vol.6 No.-
A hydraulic fatigue test machine was manufactured using a personal computer and a proportional valve, a hydraulic system. This machine was controlled loading waves and stress ratios, frequency by personal computer. A numerical simulation for the dynamic quality of this machine was done by 4 order Runge-Kutta method. Corrosion fatigue crack growth behaviors of SPH41 in 3% NaCl aqueous solution were investigated with this machine. Corrosion fatigue crack growths of this steel were reduced than the uncoated steel by anti-corrosion effect of zinc.
김귀식,현경수,오맹종 한국마린엔지니어링학회 1995 한국마린엔지니어링학회지 Vol.19 No.3
In order to investigate the effect of TiN coating on corrosion fatigue behavior of metal, the rotary bending corrosion fatigue tests were carried out in 3% NaCl solution by using the round bar specimens of high-speed steel, SKH-9, coated with TiN by PVD method. From the experimental results, fatigue strength of TiN coating steel in air was obvious improvement as compared with that of the substrate because of the restriction of dislocation movement in near surface of the substrate by hard thin film. In 3% NaCl solution, corrosion fatigue life of TiN coating specimen in high stress level was improvement same as in air. But in low stress level, corrosion fatigue life of TiN coating one was equivalent to that without coating, due to much crack initiated from corrosion pits formed at the substrate by failure of coating layer.
김귀식,현창해,현경수,오맹종 濟州大學校 産業技術硏究所 1996 산업기술연구소논문집 Vol.7 No.1
Corrosion fatigue crack growth behaviors of Zinc coating steel, SGH41, in 3% NaCl aqueous solution was investiged with a hydraulic fatigue testing machine. A hydraulic fatigue test machine was manufactured using a personal computer, a proportional valve one, a hydraulic system. Corrosion fatigue crack growth rates of SGH41 is reduced than that of the uncoated steel by anti-corrosion effect of zinc. Pans rule, da/dN=C(ΔK)^(m) is applied about the relation between the stress intensity factor range, ΔK, and crack growth rate, da/dN, of both the coated specimen and the uncoated one. Where the slope of the correlation, m, is 2.24 for the coated specimen and 3.66 for the uncoated one. The corrosion sensitivity, (da/dN)_(corr)/(da/dN)_(air), of the coated specimen was smaller than that of the uncoated specimen.