Predicting the nonlinear tensile behavior of carbon nanotubes using finite element simulation |
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Authors: | Ehsan Mohammadpour Mokhtar Awang |
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Institution: | (1) Shanghai Institute of Applied Mathematics and Mechanics, Institute of Low Dimensional Carbon and Device Physics, Shanghai University, 200072 Shanghai, People’s Republic of China |
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Abstract: | Carbon nanotubes (CNTs) possess extremely high mechanical properties and could be the ultimate reinforcing materials for the
development of nanocomposites. In this work, a Finite Element (FE) model based on the molecular mechanics theory was developed
to evaluate tensile properties of single-walled carbon nanotubes (SWCNTs). The deformation and fracture of carbon nanotubes
under tensile strain conditions were studied by common FE software, Ansys. In this model, individual carbon nanotube was simulated
as a frame-like structure, and the primary bonds between two nearest-neighboring atoms were treated as beam elements. The
beam element properties were determined via the concept of energy equivalence between molecular dynamics and structural mechanics.
So far, several researches have studied the elastic behavior of CNTs, and its nonlinearity is not well understood. The novelty
of the model lies on the use of nonlinear beam elements to evaluate SWNTs tensile failure. The obtained calculated mechanical
properties show good agreement with existing numerical and experimental results. |
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Keywords: | |
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