Abstract
The main objective of this research is to estimate the critical temperature for triple-walled carbon nanotubes (CNTs)/epoxy resin. Critical temperature in this study is the temperature that inter-laminar shear stress in interfaces of triple-walled CNTs and epoxy resin is the maximum value. At maximum inter-laminar shear stress, the stress concentration between triple-walled CNTs and epoxy resin is the maximum. This phenomenon may cause crack initiation, propagation and fracture in fibers/matrix interfaces. In the presented study, this temperature is derived by applying analytical method. The results of this research showed that maximum inter-laminar shear stress could occur at 85°C, which appears to be the critical temperature. The results of this research could be applied in any industry dealing with thermal stress and thermal cycles. Key words: Critical temperature, triple-walled carbon nanotube (CNT), nanocomposites, thermal analysis, inter-laminar shear stress, coefficient of thermal expansion.
Highlights
In many industries, application of composite materials has become common such as aerospace, automobile, etc., (Geng et al, 2018)
In performing the thermal analysis, in order to derive the critical temperature, it is important to notice that the amount of coefficient of thermal expansion (CTE) for TWCNT in the temperature range -5 to 85°C is approximately constant and is equal to -2.3 e-6 (Shirasu et al, 2017)
TWCNTE composite is one of the nanocomposites that is currently used in many applications such as aerospace industry due to excellent mechanical properties such as high strength and lightweight
Summary
Application of composite materials has become common such as aerospace, automobile, etc., (Geng et al, 2018). In recent years it is attempted to apply nanocomposites in many applications (Vilatela et al, 2012; Chae and Kumar 2006). These nanofibers may be Single-Walled Carbon NanoTubes (SWCNTs), Multiple-Walled Carbon Nano-Tubes (MWCNTs), etc., (Shirasu et al, 2017). The application of nanofibers instead of fibers may increase the strength of nanocomposites. Properties of CNTs such as electrical conductivity, mechanical and thermal, strength, and tensile and breaking mechanism have been investigated by many researchers (Ebbesen et al, 1996; Dai et al, 2008; Yu at al., 2000a; Yu et al, 2000b; Ruoff and Lorents, 1995)
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