An improved shear-lag model for carbon nanotube reinforced polymer composites

Load transfer mechanism of the composites incorporating nanohybrid shish-kebab structures

“…For the case of c = 1, the curve is monotonously increasing from the end to the center of the CNT, indicating that no load is transferred back to the matrix as there is no difference between the elastic modulus of crystalline polymer and amorphous polymer. Thus, similar with the stress distribution derived by other researchers [29,32], the load carried by the matrix is transferred from the matrix to the CNT unidirectionally along the axial direction. Note that the curve of stress distribution is not as smooth as that derived in [29,32], instead, discontinuity of slope can be observed at the boundary point of different segments.…”

“…Similar conclusions were drawn by Haque and Ramasetty [31], who developed a shear-lag model for the CNT reinforced composites as well. Considering the nonbonded interface between the CNT and the polymer matrix, Ang and Ahmed [32] proposed a non-bonded shear-lag model for the CNT reinforced polymer composites. Besides, some three phase shear-lag models were proposed to deal with the CNT reinforced composites incorporating interphase coating on the CNT [33].…”

A pull-out model for perfectly bonded carbon nanotube in polymer composites

“…The current study as well as several previous studies [Ahmed and Ang 2010;Li-Min et al 1992;Natsuki et al 2007;Xiao and Liao 2004] show that the maximum interfacial shear stress for the pull-out problem is found at the open end, i.e., at z = 0. Thus, it is expected that debonding between the CNT and the matrix will occur at the open end.…”

“…Recently, some researchers have proposed various pull-out models for CNT-reinforced composites using continuum mechanics approach [Ahmed and Ang 2010;Kin-tak 2003;Natsuki et al 2007;Tan and Kin 2004]. A number of previous studies have considered the case of frictionally bonded interface that are valid only for very weak CNT/matrix interface.…”

Investigating the mechanical properties of single walled carbon nanotube reinforced epoxy composite through finite element modelling

“…For the present study, an outer radius of the interface is taken as twice of the SWNT radius. Other than these issues, researchers have also proposed different types of bonding between SWNT and polymer matrix in their models [18,40,41] and the two most assumed approaches are further elaborated by the authors in the following two sub-sections. RVEs from both these approaches have been developed in this study for the sake of comparison.…”