열전도도 향상을 위한 직물섬유 복합재의 최적구조 설계 = Structural Optimization for Improvement of Thermal Conductivity of Woven Fabric Composites

다국어 초록 (Multilingual Abstract)

This research presents studies on an improved method to predict the thermal conductivity of woven fabric composites, the effects of geometric structures of woven fabric composites on thermal conductivity, and structural optimization to improve the thermal conductivity using a genetic algorithm. The geometric structures of woven fabric composites were constructed numerically using the information generated on waviness, thickness, and width of fill and warp tows. Thermal conductivities of the composites were obtained using a thermal-electrical analogy. In the genetic algorithm, the chromosome string consisted of thickness and width of the fill and warp tows, and the objective function was the maximum thermal conductivity of woven fabric composites. The results confirmed that an improved method to predict the thermal conductivity was built successfully, and the inter-tow gap effect on the composite`s thermal conductivity was analyzed suggesting that thermal conductivity of woven fabric composites was reduced as the gap between tows increased. For structural design, optimized structures for improving the thermal conductivity were analyzed and proposed. Generally, axial thermal conductivity of the fiber tow contributed more to thermal conductivity of woven fabric composites than transverse thermal conductivity of the tows.

참고문헌 (Reference)

1 문철진, "마이크로 유전자 알고리즘을 이용한 외부 수압을 받는 필라멘트 와인딩 복합재 원통의 최적 설계" 한국복합재료학회 23 (23): 14-20, 2010

2 Dasgupta, A., "Three-Dimensional Modeling of Woven-Fabric Composites for Effective Thermo-Mechanical and Thermal Properties" 56 : 209-223, 1996

3 Kim, D. H., "Static Aeroelastic Optimization of a Composite Using Genetic Algorithm" 13 (13): 61-71, 2000

4 Le-Manh, T., "Stacking Sequence Optimization for maximum strengths of laminated composite plates using genetic algorithm and isogeometric analysis" 116 : 357-363, 2014

5 Scida, D., "Prediction of the Elastic Behaviour of Hybrid and Non-hybrid Woven Composites" 57 : 1727-1740, 1997

6 Dasgupta, A., "Orthotropic Thermal Conductivity of Plain-Weave Fabric Composites Using a Homogenization Technique" 26 (26): 2736-2758, 1992

7 Seo, B.H., "Model for Thermal Conductivities in Spun Yarn Carbon Fabric Composites" 791-798, 2005

8 Barbero, E. J., "Introduction to Composite Materials Design" Taylor & Francis Group 1999

9 Kim, M., "Geometry Effect on Mechnical Properties of Woven Fabric Composites" 18 : 1985-1993, 2011

10 Goldberg, D. E., "Genetic Algorithms in Search, Optimization &Machine Learning" Addison Wesley Pub. Co. 1989

11 Villière, M., "Experimental Determination and Modeling of Thermal Conductivity Tensor of Carbon/epoxy Composite" 46 : 60-68, 2013

12 Ning, Q. G., "Closed-form Solutions of the Inplane Effective Thermal Conductivities of Woven-Fabric Composites" 55 : 41-48, 1995

13 Scida, D., "A Micromechanics Model for 3D Elasticity and Failure of Wovenfibre Composite Materials" 59 : 505-517, 1999

14 Ning, Q.G., "A General Analytical Model for Predicting the Transverse Effective Thermal Conductivities of Woven Fabric Composites" 29A : 315-322, 1998