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흑연 블록의 피치 함침 시 가압 열처리가 함침률에 미치는 영향
권웅,김창규,안태민,정의경 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.6
Artificial graphite blocks have excellent electrical, thermal, and chemical propertiesand are used in various applications. The impregnation process is an important step inthe artificial graphite block manufacturing process for achieving high density and optimizingvarious performances. However, during the re-carbonization process after the impregnationprocess, the impregnated pitch is melted via temperature increase for recarbonization,and its low molecular weight components are volatilized. This induces elutionof the impregnated pitch that filled the pores of the graphite block, resulting in adecrease in the impregnation rate and an increase in density. Re-impregnation and re-carbonizationprocesses, which are expensive and time-consuming, are required to be performedseveral times to achieve the desired density. Therefore, this study aims to addressthis issue by applying the pressurized heat treatment during the impregnation process. The rates of density increase and impregnation rates are not significantly increased whencompared to those of the impregnated graphite block without pressurized-heat treatment. However, it was found that about 10-20 bar of the pressure could be generated during thethe pressurized-heat treatment, resulting in the increased impregnation rate of the lowerpressure impregnation, which was similar to the higher pressure impregnation.
증발법 기반 함수특성을 적용한 태풍 힌남노에 의한 산사태 해석 사례 연구
오세붕(Oh, Seboong),안태민(Ahn, Tae Min),전병곤(Jeon, Byung Gon) 한국지반공학회 2024 한국지반공학회논문집 Vol.40 No.3
산사태 예측을 위하여 불포화토 거동을 고려한 비탈면 안정성 평가를 수행하였다. 태풍 힌남노시 집중강우로 인한 실제 산사태 현장에서 시료를 채취하였다. 팽창성 불교란 시료와 팽창이전 상태에 대한 재성형시료에 대하여 증발법을 기반으로 함수특성시험을 수행하였다. 이러한 수리-역학적 특성을 고려하여 2차원 침투해석 및 안정해석을 수행하였다. 그 결과, 두 시료는 해석 결과에서 뚜렷한 차이를 보였으며 팽창성 불교란시료의 거동이 실제 비탈면 파괴를 잘 예측할 수 있었다. In this study, slope stability was evaluated in consideration of unsaturated soil behavior to predict landslides. Samples were collected from a landslide site due to heavy rainfall during Typhoon Hinnamnoh. Soil moisture characteristic tests were performed based on the evaporation method using a swelling undisturbed sample and a remolded sample. Based on the hydraulic-mechanical behavior, two-dimensional infiltration and stability analyses were performed. As a result, from the two sample types, it is found that both behaviors exhibited clear differences in the results, and the behavior of the swelling undisturbed sample was able to predict the actual slope failure appropriately.
강지헌 ( Ji Heon Kang ),김건우 ( Kun Woo Kim ),장진석 ( Jin Seok Jang ),김지욱 ( Ji Wook Kim ),양민석 ( Min Seok Yang ),구윤식 ( Yoon Sik Gu ),안태민 ( Tae Min Ahn ),권순덕 ( Sun Deok Kwon ),이재욱 ( Jae Wook Lee ) 한국복합재료학회 2021 Composites research Vol.34 No.1
본 논문은 차량에 사용되는 B필러의 강화재를 기존의 스틸 소재에서 CFRP(Carbon Fiber Reinforced Plastics)와 GFRP(Glass Fiber Reinforced Plastics)로 대체하여 경량화하는 것이 목표다. 이를 위해서는 무게는 감소시키면서 기존 B필러를 대체할 수 있는 구조안정성을 확보해야 한다. 기존 B필러는 스틸 아우터(outer)를 포함하여 다양한 형상의 스틸 강화재로 구성되며, 이와 같은 스틸 강화재 중 2가지의 스틸 강화재를 복합재로 대체하고자 한다. 이와 같은 스틸 강화재는 강화재 각각을 따로 제작하여 용접을 통해 결합되지만, 복합재 강화재는 패치(patch) 형태의 CFRP와 리브(rib) 구조의 GFRP를 활용하여 압축과 사출 공정을 통해 한번에 제작된다. CFRP는 B필러의 고강도부에 부착되어 측면 하중에 저항하도록 하였으며, GFRP 리브는 위상 최적화(Topology optimization) 기법을 통해 비틀림과 측면 하중을 저항하도록 설계하였다. 구조해석을 통해 기존 스틸 강화재와 비교 분석을 수행하였고, 경량화율을 산출하였다. This paper aims to reduce weight by replacing the reinforcements of the B-pillar used in vehicles with CFRP(Carbon Fiber Reinforced Plastics) and GFRP(Glass Fiber Reinforced Plastics) from the existing steel materials. For this, it is necessary to secure structural stability that can replace the existing B-pillar while reducing the weight. Existing B-pillar are composed of steel reinforcements of various shapes, including a steel outer. Among these steel reinforcements, two steel reinforcements are to be replaced with composite materials. Each steel reinforcement is manufactured separately and bonded to the B-pillar outer by welding. However, the composite reinforcements presented in this paper are manufactured at once through compression and injection processes using patch-type CFRP and rib-structured GFRP. CFRP is attached to the high-strength part of the B-pillar to resist side loads, and the GFRP ribs are designed to resist torsion and side loads through a topology optimization technique. Through structural analysis, the designed composite B-pillar was compared with the existing B-pillar, and the weight reduction ratio was calculated.