Modeling the tensile stress–strain response of carbon nanotube/polypropylene nanocomposites using nonlinear representative volume element |
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| Affiliation: | 1. Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Malaysia;2. School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, Malaysia;3. Cluster of Polymer Composites (CPC), Engineering and Technology Research Platform, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Penang, Malaysia;1. Department of Automation, Zhejiang University of Technology, and the Zhejiang Provincial United Key Laboratory of Embedded Systems, Hangzhou 310023, PR China;2. School of Automation and Electrical and Engineering, Zhejiang University of Science and Technology, PR China;1. Multidisciplinary Platform of Advance Engineering, Mechanical Engineering Discipline, School of Engineering, Monash University Malaysia, 47500 Selangor, Malaysia;2. School of Mechanical and Systems Engineering, Newcastle University, UK;3. Department of Wind Energy, Technical University of Denmark, Denmark;1. Dept. Metalurgia Física, Centro Nacional de Investigaciones Metalúrgicas, CENIM-CSIC, Av. Gregorio del Amo 8, 28040 Madrid, Spain;2. Facultad de Matemática, Universidad de Castilla-La Mancha, Av. Carlos III s/n, 45071 Toledo, Spain;3. Tecnalia, Mikeletegi Pasealekua 2, Parque Tecnológico, 20009 San Sebastián, Spain;1. Department of Mechanical and Mechatronics Engineering, University of Waterloo, 200 University Ave. West, Waterloo N2L 3G1, Canada;2. College of Advanced Interdisciplinary Studies, National University of Defense Technology, 137 Yanwachizhengjie Street, Changsha, Hunan 410073, China;3. Department of Systems Design Engineering, University of Waterloo, 200 University Ave. West, Waterloo N2L 3G1, Canada |
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| Abstract: | This paper presents a finite element model for predicting the mechanical behavior of polypropylene (PP) composites reinforced with carbon nanotubes (CNTs) at large deformation scale. Existing numerical models cannot predict composite behavior at large strains due to using simplified material properties and inefficient interfaces between CNT and polymer. In this work, nonlinear representative volume elements (RVE) of composite are prepared. These RVEs consist of CNT, PP matrix and non-bonded interface. The nonlinear material properties for CNT and polymer are adopted to solid elements. For the first time, the interface between CNT and matrix is simulated using contact elements. This interfacial model is capable enough to simulate wide range of interactions between CNT and polymer in large strains. The influence of adding CNT with different aspect ratio into PP is studied. The mechanical behavior of composites with different interfacial shear strength (ISS) is discussed. The success of this new model was verified by comparing the simulation results for RVEs with conducted experimental results. The results shows that the length of CNT and ISS values significantly affect the reinforcement phenomenon. |
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| Keywords: | Carbon nanotube Polymer composites Non-bonded interface Finite element modelling Representative volume element |
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