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1차 크리프 속도를 고려한 크리프 균열 진전의 유한요소 해석
최현창,Choi, Hyeon-Chang 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
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 that 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 we, in order, Prime field, HR field and RR field from crack tip.
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.
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.