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http://dx.doi.org/10.7734/COSEIK.2013.26.6.423

A Study on the Prediction of Elastoplastic Behavior of Carbon Nanotube/Polymer Composites  

Yang, Seunghwa (Department of Mechanical Engineering, Dong-A University)
Yu, Suyoung (School of Mechanical and Aerospace Engineering, Seoul National University)
Ryu, Junghyun (School of Mechanical and Aerospace Engineering, Seoul National University)
Cho, Maenghyo (School of Mechanical and Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.26, no.6, 2013 , pp. 423-430 More about this Journal
Abstract
In this research, a paramteric study to account for the effect of interfacial strength and nanotube agglomeration on the elastoplastic behavior of carbon nanotube reinforced polypropylene composites is performed. At first, the elastoplastic behavior of nanocomposites is predicted from molecular dynamics(MD) simulations. By combining the MD simulation results with the nonlinear micromechanics model based on the Mori-Tanaka model, a two-step domain decomposition method is applied to inversely identify the elastoplastic behavior of adsorption interphase zone inside nanocomposites. In nonlinear micromechanics model, the secant moduli method combined with field fluctuation method is used to predict the elastoplastic behavior of nanocomposites. To account for the imperfect material interface between nanotube and matrix polymer, displacement discontinuity condition is applied to the micromechanics model. Using the elastoplastic behavior of the adsorption interphase zone obtained from the present study, stress-strain relation of nanocomposites at various interfacial bonding condition and local nanotube agglomeration is predicted from nonlinear micromechanics model with and without the adsorption interphase zone. As a result, it has been found that local nanotube agglomeration is the most important design factor to maximize reinforcing effect of nanotube in elastic and plastic behavior.
Keywords
carbon nanotube; nanocomposites; nonlinear multiscale model; molecular dynamics; adsorption interphase;
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