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- 저자 : 홍석표 ( Jong Seok Kim (검색결과 8 건)
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원주방향 관통균열 및 표면균열이 존재하는 90도 곡관의 한계내압
홍석표(Seok-Pyo Hong),김종현(Jong-Hyun Kim),김윤재(Yun-Jae Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper proposes closed-form plastic limit load solutions for elbow with circumferential through-wall crack or part-through surface crack under internal pressure. This work was performed using 3-dimensional, small strain FE analyses based on elastic-perfectly plastic materials. The wide range of elbow and throughwall crack (or part-through surface crack) geometries is considered. Circumferential crack in extrados and intrados is considered.
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경화온도에 따른 Castor Oil / epoxy 의 강인성
김종석,홍석표 ( Jong Seok Kim,Suk Pyo Hong ) 한국공업화학회 1997 공업화학 Vol.8 No.6
Diglycidyl ether of bisphenol A(DGEBA)수지에 castor oil(CO)로 혼합한 후 경화촉매인 tris(dimethylaminomethyl) phenol(DMP-30)로 반응시킨 에폭시의 강인성과 모폴로지를 관찰하였다. 개질제인 CO와 에폭시수지의 혼합물은 기존의 에폭시 개질제인 carboxyl terminated butadiene acryonitrile(CTBN)보다 상용성이 좋았다. 경화온도와 CO의 양이 증가할수록 유리전이온도가 감소하였는데, CO/에폭시 경화물은 경화온도가 증가할수록 가교밀도가 감소하면서 연성구조를 갖게 되는 것으로 해석되었다. CO/에폭시 경화물은 경화온도 40℃에서 CO의 양이 증가함에 따라 강인성이 약간 증가하였다. 경화온도가 증가와 CO의 양이 증가함에 따라 강인성이 증가하였다. The toughness and morphology of epoxy resin based on diglycidyl ether of bisphenol A(DGEBA) cured with of tris (dimethylaminomethyl) phenol(DMP-30) and castor oil(CO) as a toughening modifier have been studied. Mixtures of CO and an epoxy resin showed a higher miscibility than the classical CTBN modified epoxy resin. The glass transition temperature(Tg) was decreased with the CO content and the cure temperature. It is interpreted that the networks of epoxy matrix obtained at high temperature are apparently looser and more flexible due to the lower crosslinking density. The toughness was slightly increased with the CO content at 40℃ of curing temperature. The toughness increased with increasing the cure temperature and CO content.
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CTBN / PU / Epoxy 의 파괴인성에서 폴리우레탄의 영향
김종석,홍석표 ( Jong Seok Kim,Suk Pyo Hong ) 한국공업화학회 1998 공업화학 Vol.9 No.2
에폭시 adduct carboxyl terminated butadiene acrylonitrile(CTBN)은 CTBN과 에폭시수지를 블렌딩하여 제조하였다. CTBN과 폴리우레탄(PU) 및 에폭시수지로 CTBN/PU/epoxy를 제조하였다. CTBN이 5 wt%에서 CTBN/PU/Epoxy는 PU의 함량이 증가할 수록 damping 피크가 이동하였다. PU의 함량이 증가할수록 상용성이 증가함을 의미한다. 그러나 CTBN의 함량이 증가함에 따라 상용성은 감소하였다. CTBN/PU/epoxy에서는 PU의 함량이 l0wt%에서 최대 굴곡값을 나타냈으나, PU 함량이 증가할수록 감소하였다. CTBN/epoxy에서 PU를 첨가함에 따라 파괴인성은 증가하였다. 파괴단면에서 전단변형과 공동화에 의한 응력백화현상을 보였다. CTBN의 공동화와 PU를 도입한 에폭시 매트릭스의 전단변형이 CTBN/PU/epoxy의 강인화기구이다. Epoxy adduct carboxyl terminated butadiene acrylonitrile(CTBN) was prepared by blending of CTBN and epoxy resin. CTBN/PU/epoxy was prepared from polyurethane(PU), epoxy resin, and CTBN. The CTBN/PU/epoxy using 5 wt% of CTBN content showed shifting damping peak as PU content increased. It suggested that CTBN/PU/epoxy had good compatibility for all composition at 5 wt% of CTBN content. But miscibility of CTBN/PU/epoxy decreased with the increase of the CTBN content. PU content for maximum flexural properties of CTBN/PU/epoxy was 10 wt%, but decreased with the increase of the PU content. The fracture toughness of CTBN/epoxy was improved by addition of the PU. Fracture surfaces of CTBN/PU/epoxy showed the shear deformation and generation of stress whitening which is associated with the cavitation. Cavitation in the CTBN and shear defomation in the PU modified epoxy matrix are the toughening mechanisms for CTBN/PU/epoxy.
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복합하중이 작용하는 원주방향 표면균열 곡관에 대한 소성한계하중
김종현(Jong-Hyun Kim),홍석표(Seok-Pyo Hong),김윤재(Yun-Jae Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
This paper provides plastic limit load (limit load and twice-elastic-slope (TES) plastic limit load) of pipe bends with circumferential part-through surface crack under combined loading, internal pressure and global bending. Such solutions are developed based on detailed three-dimensional (3-D) finite element (FE) limit analyses using elastic-perfectly-plastic material behavior. Regarding a crack location, both internal extrados and intrados cracks are considered. Based on the RE results, TES plastic loads are proposed for practical applications, and compared with corresponding solutions for defect-free elbows.
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전선 보호용 관으로 사용되는 고밀도 폴리에틴렌 (HDPE)의 물성에 관한 연구
홍석표,최상구,김종석,박인숙 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
Thermal, Flow and mechanical properties of high density polyethylenes(P 301, 6200 B, 4903, TR 402)used as pliable plastics conduits were studied experimentally. Thermal properties were influenced by the cooling speed of molded products. They represented higher T_g and T_m at high temperature cooling. Flow properties were influenced by the temperatures of melted resin, molecular weight and molecular structures. 6200 B and 4903 showed good fluidity. Mechanical properties were influenced by the cooling temperature of molded products and molecular structures of resin. 62000 B and 4903 showed better flexural strength and modulus.
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폴리부틸렌 테레프탈레이트와 페녹시 블렌드에서 상호교환반응의 영향
김종석,김병규,최상구,홍석표 전북대학교 공업기술연구소 1993 工學硏究 Vol.24 No.-
It is well known that ploy(butylene terephthalate)(PBT)/poly(hydroxy ether of bisphenol A)(Phenoxy)polymer blends are miscible. FTIR. SEM and Rheometer measurements have been carried out on a number of PBT/Phenoxy blends prepared by solution casting from Phenol. Interchange reaction taking place at high temperatures in PBT/Phenoxy blends were studied by FTIR. SEM and Rheometer. Results showed the influence that these types of reaction have on the frequency shift of blends by FTIR. Interchange reaction have been studied in PBT/Phenoxy blends by measuring the rheological properties in a monsanto processability tester(MPT) with residence time at 250℃. Steady shear viscosity decreased in increasung residence time, at 250℃. These results were explained on the basis of a reaction between hydroxyl groups in Phenoxy and ester groups of PBT.
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金鍾石,洪錫杓 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
DSC, FTIR and SEM measurements have been carried out on a number of Poly(butyleneterephthalate) (PTB)/Poly(hydroxy ether of bisphenol A) (Phenoxy) blends prepared by solution casting from phenol. The miscibility was observed from one glass transition temperature by differential scanning calorimetry and hydrogen bonding by Fourier transform infrared spectroscopy and the morphologies by scanning electron microscopy, These results may be explained on the basis of a reaction between ester groups of poly(butylene terephthalate) and hydroxyl groups in Phenoxy.
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