Determination of Thermoelastic Properties of Carbon Nanotube/Epoxy Composites Using Finite Element Method
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JMEPEG DOI: 10.1007/s11665-017-2981-3
Determination of Thermoelastic Properties of Carbon Nanotube/Epoxy Composites Using Finite Element Method Sushen Kirtania and Debabrata Chakraborty (Submitted April 11, 2017; in revised form August 15, 2017) In the present study, three-dimensional finite element (FE) analysis has been performed for determination of thermoelastic properties of carbon nanotube (CNT)/epoxy composites considering both linear and nonlinear stress–strain relations of CNT. A square representative volume element has been considered for the FE analysis (FEA), and the effect of considering nonlinear stress–strain relation of CNT on the prediction of thermoelastic properties has been determined by comparing the results with the theoretical results. Results show that in order to obtain realistic values of thermoelastic properties, the nonlinear stress–strain relation of CNT needs to be used in the FEA. Not considering nonlinear stress–strain relation of CNTs in the FEA may lead to estimating erroneous values of thermoelastic properties of CNT composites which may have adverse effect in the design of structural components made of such composites subjected to thermomechanical loading. Keywords
advanced characterization, finite element analysis, modeling and simulation, nonlinear stress–strain relation, representative volume element, thermoelastic properties
1. Introduction Due to their exceptionally remarkable mechanical, thermal and electrical properties, CNTs are gaining potential as reinforcing materials for the next-generation advanced nanocomposites. Therefore, CNT-based composites have been one of the important research areas since last 20 years. Due to their sizes, fabrication process and conducting tests for characterizing such CNT-based composites are extremely difficult and many a times are not economical. Therefore, analytical methods and numerical simulation are very often used for understanding, analyzing and designing of such nanocomposites. Determination of thermoelastic properties is one of the important tasks where FE simulation can be used advantageously. In recent years, a large number of works have been reported on CNT/epoxy composite. Some of these are discussed here. Kausar et al. (Ref 1) presented a comprehensive review on the applications of CNT/epoxy composites. Cheng et al. (Ref 2) reported that the YoungÕs modulus and tensile strength of the This article is an invited paper selected from presentations at ‘‘ICETINN-2017, International Conference on Emerging Trends in Nanoscience and Nanotechnology,’’ held March 16-18, 2017, in Majitar, Sikkim, India, and has been expanded from the original presentation. Sushen Kirtania, Department of Mechanical Engineering, Tezpur University, Tezpur, Assam 784028, India; and Debabrata Chakraborty, Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, Assam, India. Contact e-mails: [email protected], [email protected], and [email protected].
Journal of Materials Engineering and Performance
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