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유리섬유 보강재의 적층구성, 제작공법과 수지종류에 따른 구조강도 특성에 관한 연구
송하철(ha-Cheol Song),염재선(Jae-Seon Yum) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.5
Fiberglass-Reinforced Plastic (FRP) composites have been used for small fishing boats and leisure boats for many years. These composites have different physical characteristics, depending on the constitution of lay-up and manufacturing method. Recently, new manufacturing methods, such as vacuum infusion, have been used to make the composites lighter and stronger. In this research, the mechanical properties of fiberglass reinforcements with constitution of lay-up, manufacturing method, and two different resins were investigated experimentally. It was found that the mechanical properties of FRP composites increased with increasing thickness, with the use of vacuum infusion method, and with the use of vinyl ester resin. The mechanical properties of diverse FRP composites can be used as a practical guide for selecting appropriate materials for specific applications.
멤브레인 LNG 선박용 강화 폴리우레탄폼의 극저온 거동 연구
장철웅(Cheol-Woong Jang),심천식(Chun-Sik Shim),송하철(Ha-Cheol Song),송창용(Chang Yong Song) 한국해양공학회 2013 韓國海洋工學會誌 Vol.27 No.1
In the context of the structural performance of an LNG hold, the mechanical characteristics of the insulation material are considered to be a critical design factor under cryogenic temperatures. This paper presents the thermal elasto-plastic behavior of the reinforced polyurethane foam(RPUF) adapted for the insulation material of a membrane type LNG carried via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the thermal transfer and thermal elasto-plastic deformation characteristics of an actual RPUE specimen. The heat transfer simulations based on the finite element method(FEM) include a forced convection analysis. The results of heat transfer analyses are compared with the experimental results. Reasonable cryogenic conditions for RPUF are reviewed based on both the analysis and experimental results.
허영덕,송하철,국원근,Heo, Yeong-Deok,Song, Ha-Cheol,Guk, Won-Geun 대한화학회 2006 대한화학회지 Vol.50 No.1
구조의 유기-무기 혼성화합물 Cu2(OH)3(CH3COO)·H2O를 선구물질로 사용하여 Cu2O를 합성하였다. 75oC의 수용액에서 Cu2(OH)3(CH3COO)·H2O를 글루코오스로 환원시켜서 정육면체 Cu2O를 합성하였다. 선구물질과 글루코오스의 효과를 조사하였다. Cu2(OH)3(CH3COO)·H2O의 구조는 균일한 크기의 Cu2O를 만드는데 중요한 역할을 한다. has been synthesized using the layered organic-inorganic hybrids, Cu2(OH)3(CH3COO)·H2O as a precursor. Cubic Cu2O is synthesized by reducing Cu2(OH)3(CH3COO)·H2O with glucose in water at 75oC. The effects of precursor and glucose are investigated. The structure of Cu2(OH)3(CH3COO)·H2O plays an important role in preparing the uniform size of Cu2O.
극저온 실험 및 해석 기반 LNG 운반선 용 강화 폴리우레탄의 기계적 특성 평가
장철웅(Cheol-Woong Jang),심천식(Chun-Sik Shim),송하철(Ha-Cheol Song),송창용(Chang Yong Song) 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
In the context of structural performance on LNG hold, the mechanical characteristics of insulation material are considered a critical design factor under a cryogenic temperature. This paper presents the thermo-elastic behavior of the reinforced polyurethane foam (RPUF) adapted for the insulation material of membrane type LNG carrier via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the characteristics for thermal transfer and static compressive deformation on the actual RPUF specimen. The heat transfer simulations based on finite element method (FEM) include forced convection analysis. The heat transfer results are mapped on structural analysis model to carry out thermal coupled analysis. Thermo-elastic behaviors estimated by simulations are compared to experimental results.
극저온 실험 및 해석 기반 LNG 운반선 용 강화 폴리우레탄의 기계적 특성 평가
장철웅(Cheol-Woong Jang),심천식(Chun-Sik Shim),송하철(Ha-Cheol Song),송창용(Chang Yong Song) 한국해양환경·에너지학회 2012 한국해양환경·에너지학회 학술대회논문집 Vol.2012 No.5
In the context of structural performance on LNG hold, the mechanical characteristics of insulation material are considered a critical design factor under a cryogenic temperature. This paper presents the themo-elastic behavior of the reinforced polyurethane foam (RPUF) adapted for the insulation material of membrane type LNG earner via both experiments and numerical simulations realizing the cryogenic condition. The experiments are carried out to investigate the characteristics for thermal transfer and static compressive deformation on the actual RPUF specimen. The heat transfer simulations based on finite element method (FEW include forced convection analysis. The heat transfer results are mapped on structural analysis model to carry out thermal coupled analysis. Thermo-elastic behaviors estimated by simulations are compared to experimental results.
저속 충격을 받는 복합 재료 적층판의 층간 분리 성장에 관한 연구
장창두(CHANG-DOO JANG),송하철(HA-CHEOL SONG),김호경(HO-KYUNG KIM),허기선(KI-SUN HUR),정종진(JONG-JIN JEONG) 한국해양공학회 2002 韓國海洋工學會誌 Vol.16 No.6
Delamination means that cracking occurs on the interface layer between composite laminates. In this paper, to predict the delamination growth in composite laminates subjected to low-velocity impact, the unit load method was introduced, and an eighteen-node 3-D finite element analysis, based on assumed strain mixed formulation, was conducted. Strain energy release rate, necessary to determine the delamination growth, was calculated by using the virtual crack closure technique. The unit load method saves the computation time more than the re-meshing method. The virtual crack closure technique enables the strain energy release rate to be easily calculated, because information of the singular stress field near the crack tip is not required. Hence, the delamination growth in composite laminates that are subjected to low-velocity impact can be efficiently predicted using the above-mentioned methods.