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Steel and Composite Structures
  Volume 38, Number 5, March10 2021 , pages 533-545
DOI: https://doi.org/10.12989/scs.2021.38.5.533
 


On the mechanics of nanocomposites reinforced by wavy/defected/aggregated nanotubes
Farshad Heidari, Keivan Taheri, Mehrdad Sheybani, Maziar Janghorban and Abdelouahed Tounsi

 
Abstract
    What is desirable in engineering is to bring the engineering model as close to reality as possible while the simplicity of model is also considered. In recent years, several studies have been performed on nanocomposites but some of these studies are somewhat far from reality. For example, in many of these studies, the carbon nanotubes (CNTs) are assumed completely straight, flawless and uniformly distributed throughout the matrix but by studying nanocomposites, we find that this is not the case. In this paper, three steps have been taken to bring the presented models for nanocomposites closer to reality. One is that assuming the straightness of nanotubes is removed and the waviness is considered. Also, the nanotubes are not considered to be pristine and the influence of defect is included in accordance with reality. In addition, the approximation of uniform distribution of nanotubes is ignored and according to experimental observations, the effect of nanotube aggregation is considered. As far as we know, this is the first study on these three topics together in an article. Moreover, we also include the size effects in our models for nanocomposites. To show the accuracy of our models, our results are calibrated with experimental results and compared with theoretical model. For numerical examples, we present the buckling behaviors of nanocomposites including the size effects using nonlocal theory and compare the results of our models with the results of models with above-mentioned approximations.
 
Key Words
    wavy CNT; defected CNT; aggregated CNT; nanocomposite reinforced with CNTs; size effects
 
Address
Farshad Heidari, Keivan Taheri and aziar Janghorban: Department of Mechanical Engineering, Shiraz Branch, Islamic Azad University, Shiraz, Iran
Mehrdad Sheybani: Department of Mechanical Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran
Abdelouahed Tounsi: YFL (Yonsei Frontier Lab), Yonsei University, Seoul, Korea
 

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