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首页> 外文期刊>International journal of mechanics and materials in design >Micromechanics-based modeling of elastic modulus and coefficient of thermal expansion for CNT-metal nanocomposites: effects of waviness, clustering and aluminum carbide layer
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Micromechanics-based modeling of elastic modulus and coefficient of thermal expansion for CNT-metal nanocomposites: effects of waviness, clustering and aluminum carbide layer

机译：基于微机械的弹性模量和用于CNT金属纳米复合材料的热膨胀系数：波纹，聚类和碳化铝层的影响

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A micromechanical model is analytically developed to estimate the elastic modulus and the coefficient of thermal expansion (CTE) of the carbon nanotube (CNT)-reinforced metal matrix nanocomposites (MMNCs). The effects of two important microstructural features, including the CNT clusters and the waviness on the thermo-elastic response are investigated. The formation of aluminum carbide (Al4C3) layer due to the interaction between the CNT and the metal matrix is considered. A good agreement is found between the available experimental data and the simulation results considering the waviness, clustering, and Al(4)C(3)interphase. The influences of volume fraction, and dispersion type of CNTs and Al(4)C(3)layer thickness on the elastic modulus and the CTE of the CNT-metal nanocomposites are examined. The non-straight shape and the clustering of CNTs are two critical factors that can significantly degrade the thermo-elastic properties. From the mechanical viewpoint on designing the CNT-metal nanocomposites, producing the homogeneous microstructure without the CNT clusters and using the straight CNTs are necessary factors to obtain the maximum level of the thermomechanical performances. The numerical results show that the formation of the Al(4)C(3)interphase may improve the MMNC macroscopic engineering constants. It is observed that aligning the CNTs into the metal matrixes leads to a significant improvement in the MMNC thermo-elastic properties. The proposed micromechanical approach can be a suitable model to predict the elastic modulus and the CTE of the CNT-reinforced MMNCs considering the important microstructural features.
机译：分析显微机械模型以估计碳纳米管（CNT） - 胁迫金属基质纳米复合材料（MMNC）的弹性模量和热膨胀系数（CTE）。研究了两个重要的微观结构特征的影响，包括CNT簇和热弹性响应的波纹。考虑了CNT与金属基质之间的相互作用导致的碳化铝（AL4C3）层的形成。在可用的实验数据和考虑波纹，聚类和Al（4）C（3）间间之间的仿真结果之间发现了一个良好的一致性。检查体积分数和分散型的CNT和Al（4）C（3）层厚度对CNT-金属纳米复合材料的CNTS厚度的影响。非直线形状和CNT的聚类是两个关键因素，可以显着降低热弹性。从机械视点设计CNT-金属纳米复合材料，产生没有CNT簇的均匀微观结构，并且使用直线CNT是获得热机械性能最大水平的必要因素。数值结果表明，Al（4）C（3）间的形成可以改善MMNC宏观工程常数。观察到将CNT与金属基质对准导致MMNC热弹性性质的显着改善。所提出的微机械方法可以是适当的模型，以预测考虑到重要的微观结构特征的CNT加固MMNC的弹性模量和CTE。

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