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유한요소법을 이용한 내부 손상결함 탄소강 배관의 강도해석
정중호(Jung-Ho Jeong),석금철(Kum -Cheol Seok) 산업기술교육훈련학회 2010 산업기술연구논문지 (JITR) Vol.15 No.4
Fracture behaviors and strengths of pipes are very important for the integrity of vehicles, ocean structures, and so on forth. In pipes of vehicles and ocean structures, sometimes, the local wal thinning may result from severe erosion-corrosion damage. The elasto-plastic analysis is performed by FE code ANSYS on straight pipes with wall thinning. We evaluated the failure mode, fracture strength and fracture behavior from FE analysis. Also, the effect of the axial strain on deformations and failure modes was estimated by Finite element analysis. From the results, the fracture behaviors of pipes with the outer wall thinning were showed that can be applied to estimate the fracture behaviors of pipes with the inter wall thinning.
연규석 ( Yeon Kyu-seok ),조규우 ( Jo Kyu-woo ),최종윤 ( Choi Jong-yun ),정중호 ( Jeong Jung-ho ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
In this study, rrethyl methacrylate (NtMA)-modified unsaturated polyester mortar, in which the .MMA was added to the unsaturated polyester resin, was developed for improving the early-age strength and the workability of the conventional pol~ concrete, binder of which was the unsaturated polyester resin. Then the strength properties of the .MMA-modified unsaturated polyester mortar were surveyed. The experiIrental results showed that early-age strength was greater when the MMA contents were increased in the range of 20-40%, but the strength rather showed a tendency of decrease when the .MMA contents was 50%.
유리섬유보강 폴리머 복합패널의 피로특성 : Fatigue Properties of Glass Fiber Reinforced Polymer Composite Panel
연규석,정중호,권택정,김성기 강원대학교 부설 석재복합신소재 제품연구센터 2004 석재연 논문집 Vol.9 No.-
본 연구는 압축강도 1,020 kgf/㎠를 갖는 폴리머 모르타르를 중심부로 하고 내·외표면은 고인장의 GF RP로 보강된 샌드위치 패널의 피로 특성에 관한 연구이다. 이를 위해 중심부 폴리머 모르타르와 압축 및 인장측 GERP보강층 두께를 달리하는 샌드위치 형식의 패널 시험체를 제작하고 이에 대한 휨 피로 시험을 수행함으로써 폴리머 모르타르 두께와 GFRP보강층 두께가 패널의 휨피로거동에 미치는 영향 즉 피로하중수준-피로수명과의 상관관계를 구명하였다. 실험결과 하중수준이 증가함에 폴리머 모르타르 및 GFRP 보강두께에 관계없이 샌드위치 패널의 피로수명은 감소하는 경향을 나타냈고, 동일 하중수준에서는 폴리머 모르타르 두께가 증가함에 따라 피로수명은 감소하는 경향을 나타냈으며, GFRP 보강층 두께가 증가함에 따라 피로수명이 증가하는 경향을 나타냈다. 한편 이러한 폴리머 모르타르 및 GFRP 보강층 두께에 따른 피로응력수준-피로수명 상관관계는 수정된 Miner의 법칙과 부합됨을 확인 할 수 있었다. Is this study, the fatigue properties of the sandwich panel of which core was made of the polymer mortar and inner and outer facings were reinforced by a high-tensile GFRP were surveyed. Sandwich-panel specimens consisted of polymer mortar core and GFRP compressive and tensile sides with various thickness were produced for the experimental study. Flexural fatigue tests were conducted to figure out the correlation between fatigue load and fatigue life for various thickness of core and facings, and its results are presented. The correlation obtained in this study between fatigue load and fatigue life for various thickness are in good agreement with the modified Miner's law.