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정지용(J. Y. Jeong),임지우(J. W. Im),금영탁(Y. T. Keum) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.5
The creep life of 9CrlMoVNb steel, in terms of Larson-Miller parameter (LMP), is evaluated by small punch (SP) creep simulation and verified by uniaxial creep test. By using the elastoplastic, finite element analysis, the small punch creep process is simulated to identify the friction phenomena and compared with the creep behaviors associated with friction coefficients. The creep life is then predicted by using the equivalent stresses associated with the punch loads and the LMP which has the relationship among the rupture time, temperature, and equivalent stress. Finally, the LMP calculated by virtue of SP-creep simulation is compared with that computed by aid of the uniaxial creep test.
발포 폴리스티렌을 사용한 경량콘크리트 패널의 차열 특성
정지용(Jeong Ji-Yong),정갑철(Jeong Gab-Cheol),김진만(Kim Jin-Man) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
To ensure the longevity and endurance of the buildings, Lightweight Panels have been applied a lot, as well as Rahmen and Flat Slab. Among the Lightweight Panels, the one with EPS(Expended Polystyrene), which reinforces weakness in bending strength that exists by attaching CRC(Cellulose Reinforced Cement board) and Mg(Magnesium board) on both sides of the panel, has widely been used. From the complex panel attached, with the CRC and Mg on both sides of the panel, you could expect enhanced fire resistance as well as an improvement in bending strength. Hereupon in this research, I have reviewed the heat-proofing performance of the types of lightweight partitioning boards with EPS and reinforcement. Accordingly I would like to suggest the basic data necessary for evaluating the possibility of using these architectural materials in residental buildings. In my research results, the boards fire resistance performance improved as each board became thicker. There is no significantly different change in the heat-proofing performance of the CRC (THK 3.2) regardless of the attachment, but it has demonstrated improved fire-resistance performance compared with the Mg. Although there is some difference in the fire resistance performance of each panel 50㎜ thick, it appears that this panel is unsatisfactory with the conditions of acceptable fire resistance structures required for its use in multi floor buildings.