摘要
基于细观力学理论,运用代表性体积单元方法研究石墨烯填充聚乳酸(PLA)复合材料导热性能。根据显微照片分析复合材料细观结构特征并构建二维随机分布模型,利用有限元方法求解复合材料等效导热系数,并通过实验结果验证模型正确性和有效性。通过参数化分析研究各细观结构参数对复合材料导热性能的影响规律,并通过传热路径分析其影响机制。结果表明:所建随机模型数值模拟结果与实验结果拟合较好;随石墨烯质量分数增加,复合材料传热性能增强,且石墨烯的长厚比与取向对复合材料整体导热性能有较大影响;同时,石墨烯与基体之间的界面接触热阻显著降低了复合材料整体导热性能。
Based on the theory of micromechanics,the thermal conductivity of poly(lactic acid)(PLA)composites filled with graphene(GR)sheets was studied by representative volume element method.According to the micrographs,the microstructure characteristics of the composite were analyzed,and a two-dimensional random model was established.The equivalent thermal conductivity of GR composite was calculated by finite element method,and the accuracy of the model was verified by experimental results.The influences of the microstructure parameters to the thermal conductivity of the composite were studied by parametric analysis,and its heat transfer mechanism was analyzed.The results show that the numerical results of the random model are in good agreement with the experimental results.With the increase of graphene mass fraction,the heat transfer performance of the composite is enhanced.The aspect ratio and orientation of graphene in the composites have great influence on the overall thermal conductivity of the GR composite.At the same time,the interfacial contact thermal resistance between graphene and matrix also has great influence on the overall thermal conductivity of the composites.The present model and the parametric analysis results can provide reference for optimal design of the absorbing materials.
作者
刘文君
韩海涛
鲁芹
高俊杰
聂榕序
LIU Wenjun;HAN Haitao;LU Qin;GAO Junjie;NIE Rongxu(China Academy of Aerospace Aerodynamics,Beijing 100074,China;Aerospace Aircraft Aerodynamic Thermal Protection Laboratory,China Aerospace Science and Technology Corporation,Beijing 100048,China)
出处
《航空材料学报》
CAS
CSCD
北大核心
2023年第2期75-82,共8页
Journal of Aeronautical Materials
关键词
石墨烯
PLA
随机模型
导热性能
数值模拟
graphene
PLA
random model
thermal conductivity
numerical simulation
