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최현창 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.4
An elast-biscoplastic finite element analysis is performed to investigate detailed growth behavior of creep cracks and the numerical results are compared with experimental results. The results of mesh translation method are compared with those of node release method. Load line displancement curve obtained from the crack growth analysis by mesh translation shows the improved results than that obtained from the crack growth by node release method when the secondary creep rate is only used as creep material property. The results of accounting for primary creep rate and instantaneous plasticity shows a good agreement with the experimental result.
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되풀이 소성영역 크기를 이용한 피로 균열 닫힘 거동의 유한요소해석
최현창,Choi, Hyeon-Chang 대한기계학회 2003 대한기계학회논문집 Vol.27 No.10
An elastic-plastic finite element analysis is performed to investigate detailed closure behaviour of fatigue cracks in residual stress fields and the numerical results are compared with experimental results. The finite element analysis performed under plane stress using contact elements can predict fatigue crack closure behaviour. The mesh of constant element size along crack surface can not predict the opening level of fatigue crack. Specially, the mesh of element sizes depending upon the reversed plastic zone size included the effect of crack opening point can precisely predict the opening level. By using the concept of the mesh of element sizes depending upon the reversed plastic zone size included the effect of crack opening point, the opening level of fatigue crack can be determined very well.
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최현창,서동호,정종현,Suk-Jin Ha,Min Jung Kim,김해영,박천석,이종훈,장판식 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.2
Sucrose phosphorylase, a hexosyltransferase,that is an important enzyme in starch and sucrose metabolisms, reversibly catalyzes the conversion of sucrose and orthophosphate to fructose and α-D-glucose-1-phosphate. A simple assay method for sucrose phosphorylase using 3,5-dinitrosalicylic acid (DNS) was developed. Its effectiveness was compared with that of a previously used NAD method. The results establish that the DNS method is comparable to the NAD method for the assay of sucrose phosphorylase. In particular, analysis of the enzyme activity level of sucrose phosphorylase (SPase) from Bifidobacterium longum SJ32 revealed that the DNS method is not only simple and accurate, but it also is a time-saving method for assaying sucrose phosphorylase activity. Most importantly, the DNS method is stable in broad pH ranges (pH 4-10), whereas the NAD method showed inaccurate profiles in the alkaline pH ranges (pH 8-10). Kinetic studies on SPase from B. longum SJ32 were performed using the simple DNS method developed in this study.
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수치 해석 방법을 이용한 크리프 균열 진전에 미치는 1차 크리프 속도의 영향 평가 : 1차 크리프 속도를 고려한 크리프 균열 진전의 유한요소
최현창 동명정보대학교 1999 東明情報大學校論文集 Vol.2 No.-
An elastic-viscoplastic finite element analysis is performed to investigate detailed growth behavior of creep cracks and the numerical results are compared with experimental results. In Cr-Mo steel stress fields obtained from the crack growth method by mesh translation were compared with both cases the secondary creep rate is only used as creep material property and the primary creep rate is included. Analytical stress fields, Riedel-Rice(RR) field, Hart-Hui-Riedel(HR) field and Prime(named in here) field, and the results obtained by numerical method were evaluated in details. Time vs. Stress at crack tip was showed and crack tip stress fields were plotted. These results were compared with analytical stress fields. There is no difference of stress distribution at remote region between the case of 1st creep rate + 2nd creep rate and the case of 2nd creep rate only. In case of slow velocity of crack growth, the effect of 1st creep rate is larger than the one of fast crack growth rate. Stress fields at crack tip region are, in order, Prime field, HR field and RR field from crack tip.
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