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Fracture toughness of epoxy/multi-walled carbon nanotube nano-composites under bending and shear loading conditions
Research highlights ► Mode I and mode II fracture tests were conducted on epoxy/MWCNT nano-composites. ► Addition of MWCNT to epoxy increased both K I c and K II c of nano-composites. ► The improvement in K II c was more pronounced than in K I c. ► Mode I and mode II fracture surfaces were studied by scanning electron microscopy.
Abstract The effects of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties of epoxy/MWCNT nano-composites were studied with emphasis on fracture toughness under bending and shear loading conditions. Several finite element (FE) analyses were performed to determine appropriate shear loading boundary conditions for a single-edge notch bend specimen (SENB) and an equation was derived for calculating the shear loading fracture toughness from the fracture load. It was seen that the increase in fracture toughness of nano-composite depends on the type of loading. That is to say, the presence of MWCNTs had a greater effect on fracture toughness of nano-composites under shear loading compared with normal loading. To study the fracture mechanisms, several scanning electron microscopy (SEM) pictures were taken from the fracture surfaces. A correlation was found between the characteristics of fracture surface and the mechanical behaviors observed in the fracture tests.
Fracture toughness of epoxy/multi-walled carbon nanotube nano-composites under bending and shear loading conditions
Research highlights ► Mode I and mode II fracture tests were conducted on epoxy/MWCNT nano-composites. ► Addition of MWCNT to epoxy increased both K I c and K II c of nano-composites. ► The improvement in K II c was more pronounced than in K I c. ► Mode I and mode II fracture surfaces were studied by scanning electron microscopy.
Abstract The effects of multi-walled carbon nanotubes (MWCNTs) on the mechanical properties of epoxy/MWCNT nano-composites were studied with emphasis on fracture toughness under bending and shear loading conditions. Several finite element (FE) analyses were performed to determine appropriate shear loading boundary conditions for a single-edge notch bend specimen (SENB) and an equation was derived for calculating the shear loading fracture toughness from the fracture load. It was seen that the increase in fracture toughness of nano-composite depends on the type of loading. That is to say, the presence of MWCNTs had a greater effect on fracture toughness of nano-composites under shear loading compared with normal loading. To study the fracture mechanisms, several scanning electron microscopy (SEM) pictures were taken from the fracture surfaces. A correlation was found between the characteristics of fracture surface and the mechanical behaviors observed in the fracture tests.
Fracture toughness of epoxy/multi-walled carbon nanotube nano-composites under bending and shear loading conditions
Ayatollahi, M.R. (author) / Shadlou, S. (author) / Shokrieh, M.M. (author)
2010-11-16
10 pages
Article (Journal)
Electronic Resource
English
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