Modeling creep behavior of carbon nanotube/fiber/polymer composite cylinders

Abstract

In this research, the effects of multi-walled carbon nanotubes on the distribution of long-term creep strains in thickwalled multi-walled carbon nanotube/fiber/polymer three-phase laminated composites are studied. In the first step, micromechanical models are developed to calculate the elastic properties of multi-walled carbon nanotube/vinylester and multi-walled carbon nanotube/E-glass fiber/vinylester composites. Using classical lamination plate theory, equilibrium and compatibility equations and strain-displacement relations, the distribution of effective stresses is considered. Moreover, utilizing Schapery single-integral model for nonlinear viscoelastic materials, Prandtl-Reuss relations and Mendelson's approximation method, not only the distribution of circumferential and radial strains is investigated but also the effects of fiber orientation and weight fraction (wt.%) of the multi-walled carbon nanotubes on the way of distribution are studied. The results demonstrated that the addition of the multi-walled carbon nanotube to the vinylester can reduce absolute values of the radial and circumferential creep strains and dimensionless effective stresses. Moreover, most reduction occurred in the inner wall of the cylindrical shell when fiber orientation was a = 90°. Keywords Long-term creep strain, micromechanical model, multi-walled carbon nanotube/glass fiber/vinylester, Schapery single integral, three-phase composite cylinder Date

Agglomeration and aspect ratio effects on the long-term creep of carbon nanotubes/fiber/polymer composite cylindrical shells

“…In this comparison, fiber orientation is α=45° and weight fractions is 4.5%, and results after 10 years are investigated. Figure 3 demonstrated the comparison distribution of the radial and circumferential creep strain in the wall of cylinder in present study and other results [23]. It is clear that there is good agreement between these results.…”

“…To demonstrate the accuracy of the present solution, a comparison has been made between the present study and the previous work studied by Ghasemi et al. [23], and the effects of MWCNTs on the distribution of long-term creep strains in thick-walled MWCNTs/glass fiber(GF)/polymer three-phase laminated composites are studied. The nano-composite assumed is made of MWCNTs/GF/vinylester with unidirectional material, and mechanical and thermal properties are shown in Table 2.…”

“…In another work, Ghasemi and Hosseinpour [22] have studied the rotating cylinder made of polypropylene reinforced with MWCNTs subjected to magneto-thermo-mechanical loading and is investigated using Burgers viscoelastic creep model. Ghasemi et al [23] studied the influence of the weight fraction of MWCNTs and lay-ups on the way of distribution creep strains in the wall of the MWCNTs/E-glass/vinyl-ester three-phase nano-composites. Their results demonstrated that the addition of the MWCNTs to the vinyl-ester can reduce the absolute values of the radial and circumferential creep strains.…”

“…Ghasemi et al. [23] studied the influence of the weight fraction of MWCNTs and lay-ups on the way of distribution creep strains in the wall of the MWCNTs/E-glass/vinyl-ester three-phase nano-composites. Their results demonstrated that the addition of the MWCNTs to the vinyl-ester can reduce the absolute values of the radial and circumferential creep strains.…”

Effects of carbon nanotube/polymer interfacial bonding on the long‐term creep performance of nanophased glass fiber/epoxy composites

“…He reported that the creep profiles at 50°C show better stress transfer than 110°C, due to induced tensile stresses at high temperature. Ghasemi et al modeled the creep behavior of CNT in glass fiber vinyl ester composite and reported that the addition of CNT can reduce absolute values of the radial and circumferential creep strains and dimensionless effective stresses. In general creep in FRP composite is mostly driven by the matrix phase, and hence matrix modification may be thought of a potential way to improve the creep performance of FRP composite.…”