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정찬우,배일준,박영빈 한국복합재료학회 2020 Composites research Vol.33 No.5
Design of Composite Laminates Using EFiber-reinforced composite laminates have high specific stiffness and strength and are expected to be useful for weight reduction in weight-sensitive industries, such as automotive and aerospace. However, designing composite laminates is often dependent on designer’s experience and intuition because of difficulties in determining the number of plies and stacking sequence, which tends to lead to over-design. In this study, optimal design of composite laminates was performed to minimize weight, while withstanding the given load. Based on the enumeration method, all combinations of stacking sequence satisfying the design guideline for composite laminates were considered. Composite laminates were discretized into panels. Optimal number of plies and stacking sequence for each panel were determined considering local load on each panel and contiguity across adjacent panels. Failure index from Tsai-Wu criteria was optimized for strength and buckling analysis was performed for compressive load. Stacking angles of 0, ±45 and 90° were used.numeration Method 섬유강화 복합재 적층판은 높은 비강성과 비강도를 가지고 있으며, 자동차 및 항공과 같은 무게에 민감한 산업에서 경량화에 유용할 것으로 기대되고 있다. 하지만 복합재 적층판의 설계는 적층 개수와 적층 순서를 모두 결정해야 하는 어려움으로 인해 설계자의 축적된 경험과 직관에 의존하는 경우가 많고, 이는 필요 이상으로 제품의 중량이 증가하는 과설계로 이어질 수 있다. 본 연구에서는 주어진 하중을 견디고 최소 무게를 갖는 복합재적층판의 최적설계를 수행하였다. 나열법을 기반으로, 복합재 적층판의 설계 지침을 만족하는 모든 경우의 적층조합을 고려하였다. 복합재 적층판을 여러 개의 패널로 나누고, 각 패널의 응력 분포와 인접한 패널 간 연결성을고려하여 최적의 적층 수와 적층 순서를 결정하였다. 강도를 고려하기 위해 Tsai-Wu 파손 이론으로부터 파손 지수를 최적화하였고, 압축 하중에 대해서는 좌굴 해석을 수행하였다. 적층각은 일반적으로 사용하고 있는 0, ±45, 90°를 사용하였다.
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탄소섬유강화 폴리카보네이트 복합재료의 제조 및 특성 분석
원종성,배일준,정진욱,조원기,조호현,이승구 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.6
In order to develop the high impact resistant composites with high mechanical properties, carbon fiber composites of polycarbonate matrix having high toughness were studied. Carbon fiber reinforced polycarbonate (carbon/polycarbonate) composites were manufactured by a hot press molding under different temperature (270−285oC) and pressure (1.5−5 ton/in2) conditions. The mechanical properties of flexural, interlaminar shear strength, impact energy and morphological features of the carbon/polycarbonate composites were investigated with the molding conditions. The carbon/polycarbonate composites manufactured at 280oC and 3.5 ton/in2 for 3 min. was found to have maximum flexural strength of 820 MPa and interlaminar shear strength of 55 MPa due to the effects of high matrix impregnation and good fiber alignment. On the other hand, the maximum impact resistance of the composite appeared at low flexural strength and interlaminar shear strength.
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탄소섬유/폴리아미드 6 복합재료의 비등온 결정화 거동 및 냉각속도에 따른 물성 분석
정진욱,조원기,이하람,원종성,배일준,이승구,Jeong, Jin Wook,Cho, Won Gi,Lee, Ha Ram,Won, Jong Sung,Bae, Il Joon,Lee, Seung Goo 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.6
Carbon fiber/polyamide 6 (CF/PA6) composites were prepared via film melt impregnation and their crystallization and mechanical properties were studied. The non-isothermal crystallization behavior and mechanical properties of polyamide 6 and CF/PA6 were investigated at different cooling rates. The crystallization time of CF/PA6 decreased depending on the cooling rate compared to that of polyamide 6. The carbon fibers likely acted as nucleating agents in the polyamide 6 matrix. The flexural strength of the composites increased when manufactured at lower cooling rates due to the effects of increased crystallinity as the crystallization continued for a long time. In addition, as the cooling rate increased, the impact resistance increased.
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