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시편두께 및 균열깊이 영향을 고려한 비표준시편의 J 시험법 및 구속효과의 정량화
김진수,조수만,김윤재,김영진,Kim, Jin-Su,Cho, Soo-Man,Kim, Yun-Jae,Kim, Young-Jin 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.9
This paper compiles solutions of plastic $\eta$ factors and crack tip stress triaxialites for standard and nonstandard fracture toughness testing specimens, via detailed three-dimensional (3-D) finite element (FE) analyses. Fracture toughness testing specimens include a middle cracked tension (M(T)) specimen, SE(B), single-edge cracked bar in tension (SE(T)) and C(T) specimen. The ligament-to-thickness ratio of the specimen is systematically varied. It is found that the use of the CMOD overall provides more robust experimental J estimation than that of the LLD, for all cases considered in the present work. Moreover, the J estimation based on the load-CMOD record is shown to be insensitive to the specimen thickness, and thus can be used for testing specimen with any thickness. The effects of in-plane and out-of-plane constraint on the crack tip stress triaxiality are also quantified, so that when experimental J value is estimated according to the procedure recommended in this paper, the corresponding crack tip stress triaxiality can be estimated. Moreover, it is found that the out-of-plane constraint effect is related to the in-plane constraint effect.
비표준 시편의 J-적분 시험에서의 3차원 구속효과 영향 연구
김윤재(Yun-Jae Kim),김진수(Jin-Su Kim),조수만(Soo-Man Cho),김영진(Young-Jin Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.8
This paper compiles solutions of plastic ? factors and crack tip stress triaxialites for standard and non-standard fracture toughness testing specimens, via detailed three-dimensional (3-D) finite element (FE) analyses. Fracture toughness testing specimens include a middle cracked tension (M(T)) specimen, SE(B), single-edge cracked bar in tension (SE(T)) and C(T) specimen. The ligament to thickness ratio of the specimen is systematically varied. It is found that the use of the CMOD overall provides more robust experimental J estimation than that of the LLD, for all cases considered in the present work. Moreover, the J estimation based on the load-CMOD record is shown to be insensitive to the specimen thickness, and thus can be used for testing specimen with any thickness. The effects of in-plane and out-of-plane constraint on the crack tip stress triaxiality are also quantified, so that when experimental J value is estimated according to the procedure recommended in this paper, the corresponding crack tip stress triaxiality can be estimated. Moreover, it is found that the out-of-plane constraint effect is related to the in-plane constraint effect.
趙秀(Soo Cho),이장만(Jang-Man Lee),성욱주(Uk-Joo Sung),박정환(Jung-Hwan Park),송규동(Kyoo-Dong Song) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
The improvement of the window performance is important to building energy performance for the preservation of global environment and reduction of CO₂ emission. Because the heat loss of the window takes up 20∼40 % of total building load and the heat transmission coefficient of the window is 6∼7 times it of the wall and roof. Thus this study analyze the current system using the experimental data suggest the suitable standard specifications(Guide-line) to reduce the energy loss through the window.
趙秀(Cho, Soo),이장만(Lee, Jang-Man),김원석(Kim, Won-Seok),임상훈(Lim, Sang-Hoon) 대한건축학회 2012 대한건축학회논문집 Vol.28 No.10
This paper concerns about the development of complex window system integrated window, insulation shutter and shading system. For deriving development of convergence window system, first we analyze the thermal performance and thermal bridges though computer simulation program. We changed material of head and jamb component. Through analysis of Therm 6.2 & Window 6.2 result we tried to find best design for decrease thermal bridge. We are embarked on a path to build a prototype model through primary study and verified a thermal performance through KS F 2278, Test Method of Thermal Resistance for Windows and Doors. In this test, it was found that compared to a general window system, complex window system has improved thermal performance about 28%.
단열셔터를 적용한 구동창호의 에너지 절감 및 야간 난방성능 분석
이장만(Jang-Man Lee),조수(Soo Cho),임상훈(Sang-Hoon Lim),송규동(Kyoo-Dong Song) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.3
Usually, a window tends to have a lower thermal performance, than that of an ordinary wall. This study analyzes the enhancement of thermal performance of a window, when a Thermal Insulation Shutter is installed. The analyses were conducted at the laboratory, and with a full-scale mockup house, and the U-factor and heating load were examined. The laboratory results show that the U-factor increased by approximately 28%, when a Thermal Insulation Shutter was installed. The temperature difference was about 5℃, and this shows that the Thermal Insulation Shutter enhances the thermal performance of the window, when installed. The mockup house was used to calculate the heating load; the heating load was reduced by more than 41%, and shows that the installation of a Thermal Insulation Shutter is an effective way to reduce heating energy consumption.
허만성,장문석,조수 한국화재소방학회 2003 한국화재소방학회논문지 Vol.17 No.1
실제 건물화재에서 창문재료의 내화특성을 평가하기 위하여 건물화재실험이 수행되었다. 4m×3.8m×2.4m 방에서 PVC 창문, 알루미늄 창문, AL+Wood 창문을 각각 설치하고 화원은 소파와 매트리스를 사용하였다. 창문은 아파트 베란다에 많이 사용하는 유리두께 6 mm 사이에 공기층 12 mm인 것을 사용하였다. 건물내부와 창문 주변의 온도분포를 살펴보기 위하여 32개 지점의 온도를 측정하였다. 실험 결과 건물내의 온도분포, 창틀의 변화, 유리창의 파손 정도 등을 조사하여 분석하였다. The full-scale compartment fire tests were carried out to evaluate the characteristics of fire resistance of window material under actual fire conditions. The room size used for full-scale room fire tests was 4 by 3.8 m with 2.4 m high ceiling. The windows with PVC, Aluminum and AL+Wood frame materials were established, sofa and mattress were used as fire sources. The window contained pair glasses with the air between 6 mm glasses. Temperatures at total 32 points in the room were measured to find the temperature distribution in the room fire. It is examined that thermal effects on window frame materials such as charring, distortion, melting, structural collapse, and other effects.