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Polyamide 6 입자 및 CTBN 첨가 기술에 따른 에폭시/탄소섬유 복합재의 강인화 효과 및 기계적 특성
배성열,이교문,석지훈,최재완,손우혁,김윤해,Sung-Youl Bae,Kyo-Moon Lee,Sanjay Kumar,Ji-Hun Seok,Jae-Wan Choi,Woo-Hyuk Son,Yun-Hae Kim 한국복합재료학회 2023 Composites research Vol.36 No.5
Epoxy-based carbon fibers reinforced plastic (CFRP) exhibit limitations in their suitability for industrial applications due to high brittleness characteristics. To address this challenge, extensive investigations are underway to enhance their toughness properties. This research focuses on evaluating the toughening mechanisms achieved by Polyamide 6 particles(p-PA6) and Carboxyl-Terminated Butadiene-Acrylonitrile (CTBN) elastomer, with a specific emphasis on utilizing minimal additive quantities. The study explores the impact of varying concentrations of p-PA6 and CTBN additives, namely 0.5, 1, 2.5, and 5 phr, through comprehensive Mode I fracture toughness and tensile strength analyses. The inclusion of p-PA6 demonstrated improvements in toughness when introduced at a relatively low content of 1phr. This improvement manifested as a sustained fracture behavior, contributing to enhanced toughness, while simultaneously maintaining the material's tensile strength. Furthermore, the investigation revealed that the incorporation of p-PA6 affected in particle aggregation, thus influencing the overall toughening mechanism. Incorporation of CTBN, an elastomeric modifier, exhibited a pronounced increase in fracture toughness at higher concentrations of 2.5 phr and beyond. However, this increase in toughness was accompanied by a reduction in tensile strength, resulting in fracture behavior similar to conventional CFRP exhibiting brittleness. The synergy between pPA6, CTBN and CFRP appeared to marginally enhance tensile strength under specific content conditions. As a result of this study, optimized conditions for the application of the p-PA6, CTBN toughening technology have been identified and established.
배성열(Sung-youl Bae),김범석(Bum-suk Kim),김우준(Woo-june Kim),김만응(Mann-eung Kim) 한국마린엔지니어링학회 2010 한국마린엔지니어링학회 학술대회 논문집 Vol.2010 No.4
This research presents structural design processes of 3㎿ wind turbine blades and their structural safety evaluation results by FEM analysis. The blade designs were based on modem wind turbine model, which is modem FRP stressed-skin sandwich design, and three kinds of blade models were designed. After structure designs of 3 kinds of blade models were accomplished, structural safety evaluations of the models were performed by Puck's composite failure theory. The results showed that All glass model had sufficient structural safety, and carbon spar cap model could be a reasonable solution to reduce weights, tip displacements.
복합재료 고전적층판 이론을 이용한 MW급 해상풍력 블레이드 구조설계
배성열(Sung-Youl Bae),김범석(Bum-Suk Kim),이상래(Sang-Lae Lee),김우준(Woo-June Kim),김윤해(Yun-Hae Kim) 한국해양공학회 2014 韓國海洋工學會誌 Vol.28 No.2
This research presents a method for initial structural design of a multi-megawatt wind turbine blade. The structural data for a 2-MW blade were applied as the blade structural characteristic data of the reference blade. Tenkinds of blade models were newly designed by replacing the spar cap axial GRRP with a GFRP and CFRP. These terms should be defined. at different orientations. The axial stiffness coefficients of the newly designed models were made equal to the coefficient of the reference blade. The required numbers of layers in each section of blades were calculated, and the lay-up designs were based on these numbers. Verification results showed that the design method that used the structural data of the reference blade was appropriate for the initial structural design of a wind turbine blade.
첨단 소재와 공법을 응용한 무인잠수정의 최적설계에 관한 연구
김윤해(Yun-Hae Kim),배성열(Sung-Youl Bae),조영대(Young-Dae Jo) 한국마린엔지니어링학회 2008 한국마린엔지니어링학회 학술대회 논문집 Vol.2008 No.-
This research investigated to find out the possibilities of applying FRP to the AUV's material. In this study, two kinds of metal materials, which is one of the popularly used materials for manufacturing AUVs, and 6 kinds of FRP materials were selected. Material properties of FRP were investigated by mechanical and physical tests. Moreover, the material properties were applied to the structural analysis. From the simulation, we can find out that the weight of AUV by CFRP-Autoclave could reduce 60% of weight relate to the AUV by Al7075-T6 and 40% of weight could be reduced relative to the AUV by Ti-6Al-4V. In addition, the material of CFRP-Autoclave have sufficient mechanical properties comparing to Al alloy and Ti alloy by structural analysis.
김윤해(Yun-Hae Kim),배성열(Sung-Youl Bae),김국진(Kook-Jin Kim),한중원(Joong-Won Han),우병훈(Byung-Hoon Woo),문경만(Kyung-Man Moon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.6
Now, Composite materials are widely used because of their high specific strength and specific stiffness in marine, infrastructure applications, lesure. However, it is known that long term or short term exposure of fiber reinforced composite laminates to the moisture environments could change its chemical and physical properties irreversibly. In this study, effects of moisture absorption in various moisture environments were investigated. The results show that the mechanical properties of FRP are decreased with immersion time. Moreover, the mechanical properties of FRP are recovered throughout drying process in drying oven at 80℃.
첨단 소재와 공법을 응용한 무인잠수정의 최적설계에 관한 연구
김윤해(Yun-Hae Kim),배성열(Sung-Youl Bae),조영대(Young-Dae Jo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This research investigated to find out the possibilities of applying FRP to the AUV's material. In this study, two kinds of metal materials, which is one of the popularly used materials for manufacturing AUVs, and 6 kinds of FRP materials were selected. Material properties of FRP were investigated by mechanical and physical tests. Moreover, the material properties were applied to the structural analysis. From the simulation, we can find out that the weight of AUV by CFRP-Autoclave could reduce 60% of weight relate to the AUV by Al7075-T6 and 40% of weight could be reduced relative to the AUV by Ti-6Al-4V. In addition, the material of CFRP-Autoclave have sufficient mechanical properties comparing to Al alloy and Ti alloy by structural analysis.
첨단 소재와 공법을 응용한 무인잠수정의 최적설계에 관한 연구
김윤해(Yun-Hae Kim),배성열(Sung-Youl Bae),조영대(Young-Dae Jo) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.공동학술
This research investigated to find out the possibilities of applying FRP to the AUV's material. In this study, two kinds of metal materials, which is one of the popularly used materials for manufacturing AUVs, and 6 kinds of FRP materials were selected. Material properties of FRP were investigated by mechanical and physical tests. Moreover, the material properties were applied to the structural analysis. From the simulation, we can find out that the weight of AUV by CFRP-Autoclave could reduce 60% of weight relate to the AUV by Al7075-T6 and 40% of weight could be reduced relative to the AUV by Ti-6AI-4V. In addition, the material of CFRP-Autoclave have sufficient mechanical properties comparing to Al alloy and Ti alloy by structural analysis.