Abstract
The purpose of this research is to investigate and analyze the effect of temperature on the mechanical properties of carbon composites, aluminum foam, and carbon nanotube reinforced aluminum foam. For this analysis, fatigue behavior of aluminum foam has been discussed, and interlaminar shear stress between single-walled carbon nanotube reinforced aluminum foam and multiwalled carbon nanotube reinforced aluminum foam has been compared. The comparison has shown that the interlaminar shear stress within the interface of single-walled carbon nanotube and aluminum foam is higher than that within the interface of multiwalled carbon nanotube and aluminum foam. Hence, the probability of stress concentration and crack initiation within the interface of single-walled carbon nanotube and aluminum foam is higher than that within the interface of multiwalled carbon nanotube and aluminum foam. Furthermore, thermal fatigue lives of different single-walled carbon nanotube reinforced matrix nanocomposites have been evaluated. Additionally, interaction between carbon and molten aluminum has been analyzed. Finally, a new relation for the thermal interlaminar shear stress intensity factor to predict the crack initiation sites on fiber/matrix interface has been introduced.
Highlights
Carbon nanotubes (CNTs) have been introduced by Lijima in 1991 for the first time [1]
Average interlaminar shear stress (ILSs) within the SWCNT/aluminum foam (SWCNTAF) is 349% more than that within the MWCNT/aluminum foam (MWCNTAF). e only result that makes the opposite conclusion is the difference of Coefficient of ermal Expansion (CTE) between singlewalled carbon nanotubes (SWCNTs) and aluminum foam (AF) that is 19% less than that between multiwalled carbon nanotubes (MWCNTs) and AF
It means that, based on the results obtained in this study, it appears that crack initiation and/or propagation on interfaces between the nanofiber and matrix within the SWCNTAF may occur with higher probability when compared to that within the MWCNTAF. is result suggests using MWCNTAF instead of SWCNTAF in cases dealing with thermal cycling condition for having a longer thermal life
Summary
Carbon nanotubes (CNTs) have been introduced by Lijima in 1991 for the first time [1]. Due to the excellent properties of CNT, nowadays its application is broad in many industries such as aerospace and automotive industries. Carbon nanotubes have great mechanical properties such as high tensile strength, high Young’s modulus, and high aspect ratio which makes CNTone of the best materials for different applications. The electrical conductivity of CNT is high [2]. For enhancing the knowledge regarding the CNTs, a few studies to further analyze the mechanics and forest synthesis of CNT have been published [3,4,5,6]. For evaluating the effect of CNTs on the mechanical and/or thermal properties of composite materials, many studies have been provided [7,8,9,10]
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