Thermal conductivity prediction of unidirectional composites based on microstructure identification
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摘要: 以T300碳纤维/环氧树脂基单向复合材料为例,考虑纤维周围间隙缺陷的影响,建立了基于微观图像识别的等效导热系数预估方法.首先利用图像识别技术处理材料微观电镜照片,然后依据纤维体积分数稳定性判据应用几何重构技术建立了代表性单元,并通过在代表性单元(RVE)内部交界面处添加接触热阻的方法引入间隙缺陷的影响,最终利用有限元方法模拟得到等效导热系数(ETC).研究发现:间隙的位置对等效导热系数影响微弱;随着间隙缺陷占比和厚度的增加,等效导热系数显著降低;间隙缺陷占比大于0.8,无量纲间隙缺陷厚度小于0.15时,单向纤维增韧复合材料的等效导热系数受间隙影响最突出;相对于纤维和基体理想接触的情况,考虑间隙缺陷后,等效导热系数最大降幅可达52.1%.Abstract: Taking the T300 carbon fiber/epoxy resin matrix unidirectional composites as an example, an equivalent thermal conductivity prediction method based on microscopic image recognition was established, in consideration of the influence of the interface defect. The microstructure scanning electron microscope photos were processed first through image recognition. Then according to the fiber volume fraction stability criterion, the representative volume element(RVE) were built by geometry reconstruction technique. Meanwhile, the thermal contact resistance was added at the interfaces in the RVEs to represent the influence of the interface defects. Finally, the prediction results of equivalent thermal conductivity (ETC) were obtained by the finite element method. Results show that the randomness of the interface defect's position affects ETC weakly, while ETC decreases significantly with the increasing proportion or the thickness of the interface defect. When the the interface defect proportion is greater than 0.8 and the dimensionless thickness of the interface defect is less than 0.15, the most significant influence on ETC appears. Compared with the simulations of ignoring the interface defect between fiber and matrix, the biggest drop of ETC can reach 52.1% considering the interface defect.
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[1] 张立同,成来飞,徐永东.新型碳化硅陶瓷基复合材料的研究进展[J].航空制造技术,2003(1):24-32. ZHANG Litong,CHENG Laifei,XU Yongdong.Progress in research work of new CMC-SiC[J].Aeronautical Manufacturing Technology,2003(1):24-32.(in Chinese) [2] Lewis D A,Hogan M T,McMahon J,et al.Application of uncooled ceramic matrix composite power turbine blades for performance improvement of advanced turboshaft engines[R].Montreal:64th Annual Forum-AHS International,2008. [3] Min J B,Harris D L,Ting J M.Advances in ceramic matrix composite blade damping characteristics for aerospace turbomachinery applications[R].AIAA-2011-178,2011. [4] Morscher G N.Modeling the stress strain behavior of woven ceramic matrix composites[R].Baltimore:The 107th Annual American Ceramic Society Conference,2005. [5] Zhu D,Miller R A,Fox D S.Thermal and environmental barrier coating development for advanced propulsion engine systems[R].AIAA-2007-2130,2007. [6] Rayleigh L,On the influence of obstacles arranged in rectangular order upon the properties of a medium[J].Philosophical Magazine:Series 5,1982,34(211):481-502. [7] Hasselman D P H,Johnson L F.Effective thermal conductivity of composites with interfacial thermal barrier resistance[J].Journal of Composite Materials,1987,21(6):508-515. [8] GitmanI M,Askes H,Sluys L J.Representative volume:Existence and size determination[J].Engineering Fracture Mechanics,2007,74(16):2518-2534. [9] SHAN Zhaohui,Gokhale A M.Representative volume element for non-uniform micro-structure[J].Computational Materials Science,2002,24(3):361-379. [10] Springer G S,Tsai S W.Thermal conductivities of unidirectional materials[J].Journal of Composite Materials,1967,1(2):166-173. [11] Zou M,Yu B,Zhang D,et al.Study on optimization of transverse thermal conductivities of unidirectional composites[J].Journal of Heat Transfer,2003,125(6):980-987. [12] Hassani B,Hinton E.A review of homogenization and topology optimization Ⅰ:homogenization theory for media with periodic structure[J].Computers & Structures,1998,69(6):707-717. [13] Hassani B,Hinton E.A review of homogenization and topology opimization Ⅱ:analytical and numerical solution of homogenization equations[J].Computers & Structures,1998,69(6):719-738. [14] Hassani B,Hinton E.A review of homogenization and topology optimization Ⅲ:topology optimization using optimality criteria[J].Computers & Structures,1998,69(6):739-756. [15] 程耿东,刘书田.单向纤维复合材料导热性预测[J].复合材料学报,1996,13(1):78-85. CHENG Gengdong,LIU Shutian.Prediction of thermal conductivity of unidirectional fiber reinforced composites[J].Acta Materiae Compositae Sinica,1996,13(1):78-85.(in Chinese) [16] Islam M R,Pramila A.Thermal conductivity of fiber reinforced composites by the FEM[J].Journal of Composite Materials,1999,33(18):1699-1715. [17] Klett J W,Ervin V J,Edie D D.Finite-element modeling of heat transfer in carbon/carbon composites[J].Composites Science and Technology,1999,59(4):593-607. [18] 陆思达,高希光,宋迎东.基于有限元法的平纹编织C/SiC复合材料等效导热系数预测方法[J].航空动力学报,2014,29(7):1574-1582. LU Sida,GAO Xiguang,SONG Yingdong.Prediction method on effective thermal conductivity coefficient of plain braided C/SiC composites material based on finite element method[J].Journal of Aerospace Power,2014,29(7):1574-1582.(in Chinese) [19] 程伟,赵寿根,刘振国,等.三维四向编织复合材料等效热特性数值分析和试验研究[J].航空学报,2002,23(2):102-105. CHENG Wei,ZHAO Shougen,LIU Zhenguo,et al.Thermal property of 3D braided fiber composites:experimental and numerical result[J].Acta Aeronautica et Astronnautica Sinica,2002,23(2):102-105.(in Chinese) [20] Ganapathy D,Singh K,Phelan P E,et al.An effective unit cell approach to compute the thermal conductivity of composites with cylindrical particles[J].Journal of Heat Transfer,2005,127(6):553-559. [21] 康博奇,严鹏,蒋持平.预报纤维增强复合材料有效热导率的随机微结构胞元模型[J].复合材料学报,2012,29(5):140-145. KANG Boqi,YAN Peng,JIANG Chiping.A random microstructure cell model to predict the effective thermal conductivity of fiber reinforced composites[J].Acta Materia Compositae Sinica,2012,29(5):140-145.(in Chinese) [22] 田志红,范华乐,张浩,等.ALN填充有机灌封硅橡胶导热性能的数值模拟[J].复合材料学报,2011,28(3):217-222. TIAN Zhihong,FAN Huale,ZHANG Hao,et al.Numerical simulation of the thermal property of ALN filled silicon encapsulant[J].Acta Materiae Compositae Sinica,2011,28(3):217-222.(in Chinese) [23] 李宇罡,王斐霏,李险峰,等.纳米颗粒增强金属基复合材料微结构有限元模型研究[J].材料导报,2011,25(14):134-138. LI Yugang,WANG Feifei,LI Xianfeng,et al.Study on the microstructure-based finite element model of metal matrix composites reinforced with nano-scaled particles[J].Materials Review,2011,25(14):134-138.(in Chinese) [24] Jiang H,Mao J K,Tu Z C,et al.Studies on thermal conductivity prediction of fiber reinforced material with microscopic structure identification[R].AIAA-2015-2355,2015. [25] Youngblood G E,Senor D J,Jones R H,et al.The transverse thermal conductivity of 2D-SiCf/SiC composites[J]. Composites Science and Technology,2002,45(9):1127-1139. [26] Lu T,Hutchinson J.Effect of matrix cracking on the overall thermal conductivity of fiber-reinforced composites[J].Philosophical Transactions of the Royal Society:A,1995,351(1697):595-610. [27] Sevostianov I,Ramos R R,Diaz G R,et al.Connections between different models describing imperfect in interfaces periodic fiber-reinforced composites[J].International Journal of Solids and Structures,2012,49(13):1518-1525.
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