Studies on Effective Elastic Properties of CNT/Nano-Clay Reinforced Polymer Hybrid Composite

5th National Conference on Processing and Characterization of Materials

Thakur, Arvind Kumar^1 ; Kumar, Puneet^1 ; Srinivas, J.^1

Department of Mechanical Engineering, National Institute of Technology Rourkela, Rourkela, Odisha

769008, India^1

关键词: Computational approach;    Effective elastic modulus;    Effective elastic property;    Halpin-Tsai;    Hybrid composites;    Micro-mechanical modeling;    Nano clays;    Representative volume element (RVE);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/115/1/012007/pdf
DOI  :  10.1088/1757-899X/115/1/012007

来源: IOP

【 摘 要 】

This paper presents a computational approach to predict elastic propertiesof hybrid nanocomposite material prepared by adding nano-clayplatelets to conventional CNT-reinforced epoxy system. In comparison to polymers alone/single-fiber reinforced polymers, if an additional fiber is added to the composite structure, it was found a drastic improvement in resultant properties. In this regard, effective elastic moduli of a hybrid nano composite are determined by using finite element (FE) model with square representative volume element (RVE). Continuum mechanics based homogenization of the nano-filler reinforced composite is considered for evaluating the volumetric average of the stresses and the strains under different periodic boundary conditions.A three phase Halpin-Tsai approach is selected to obtain the analytical result based on micromechanical modeling. The effect of the volume fractions of CNTs and nano-clay platelets on the mechanical behavior is studied. Two different RVEs of nano-clay platelets were used to investigate the influence of nano-filler geometry on composite properties. The combination of high aspect ratio of CNTs and larger surface area of clay platelets contribute to the stiffening effect of the hybrid samples. Results of analysis are validated with Halpin-Tsai empirical formulae.