Izvorni znanstveni članak
Non-linear multi-scale finite element method for prediction of tensile behaviour of carbon nanotube-reinforced polymer composites
Ehsan Mohammadpour
; Mechanical Engineering Department, Universiti Tehnologi PETRONAS, 31750 Seri Iskandar, Perak, MALAYSIA
Mokhtar Awang
; Mechanical Engineering Department, Universiti Tehnologi PETRONAS, 31750 Seri Iskandar, Perak, MALAYSIA
Sažetak
The ability of using carbon nanotubes as the strongest and stiffest elements in nanoscale composites remains a powerful motivation for research in this area. This paper describes a finite element modelling appropriate for the numerical prediction of the mechanical behaviour of polypropylene which is reinforced with single-walled carbon nanotubes. A multi-scale representative volume element is proposed for modelling the tensile behaviour of carbon nanotube reinforced composites. Within the representative volume element, the reinforcement is modelled according to its atomistic microstructure. A model based on the modified Morse interatomic potential is used for simulating the isolated carbon nanotube. In this work, the matrix is modelled as a medium in a form of a continuum by utilizing solid elements and in order to describe its behaviour, an appropriate non-linear material model is adopted. A
cohesive zone model is assumed between the nanotube and the matrix with an ideal bonding until the interfacial shear stress exceeds the corresponding strength. By using the representative volume element, a unidirectional nanotube/ polymer composite was modelled and the results were compared to the corresponding rule-of-mixtures predictions. The effect of interfacial shear strength on the tensile behaviour of the nanocomposite was also studied. The influence of adding a single-walled carbon nanotube to the polymer is discussed and the results show that Young’s modulus and tensile strength of the polymer significantly increase in the presence of carbon nanotubes.
Ključne riječi
carbon nanotube; reinforced polymer composite; multi-scale; finite element method; Morse interatomic potential
Hrčak ID:
185748
URI
Datum izdavanja:
23.1.2014.
Posjeta: 354 *