Prediction Of The Stiffness And The Strength Of CNTB/ Polymer Composite

Carbon nanotube/polymer composite has superior mechanical properties and is by far overwhelming popular among both scholars and public.But agglomeration of carbon nanotubes in polymer matrix is the most criticle problem on the account of its high aspect ratio and unstable energy.On the contrary,the CNTBs can ease this problem,which is a meaningful research and significant in applcations.In this paper,the CNTB/polymer composite was targeted for the investigation of stiffness and strength.Moreover,the mechanical responses of CNTB/polymer composit hollow cylinder in thermo-electric-fields were discussed.The details can be concluded in four aspects as follows:(1)Based on the Self-consistence model and Halpin-Tsai model,considering isotropic of carbon nanotube,the elastic modulus of composite reinforced by unidirectional CNTBs was investigated.For the randomly distribution,the laminate analog approach was used.The diameter of carbon nanotube and number of layers were discussed in numerical examples about its effects on mechanical properties of the whole composite.(2)Considering the transversely isotropic of carbon nanotube,investigation of the Young’s modulus and Poisson’s ratio of CNTBs/polymer composite was carried out via the Mori-Tanaka model and Eshelby model.And the effects of agglomeration, porosity,and bundle waviness were discussed in following numerical examples.(3)On the basis of Cottrell-Kelly-Tyson model and the hierarchical structure of CNTB,considering the end morphotype of bundle as a half semi-ellipsoid,the tensile strength of CNTB/polymer composite was studied.The diameter and length of carbon nanotube,the elliptical end and length character of bundle,and content of carbon nanotubes of one bundle and CNTBs were discussed in numerical examples.(4)Subjecting the thermo-electric fields,a CNTB/polymer composite hollow cylinder model was established to analyse the mechanical responses of the cylinder.The micro-structure of the bundle,the configuration of CNTBs in the cylinder,and boundary conditions of cylinder were discussed in numerical examples.