چكيده به لاتين
The main purpose of the present research is making samples followed by experimental tests to observe creep behavior of graphene 0/1%wt./epoxy, CNT 1%wt./epoxy and a hybrid of graphene 0/1%wt. & CNT1%wt./epoxy nano-composites. After Experimental studies and comparision of the creep properties improvement for such nano-composites with neat epoxy, to simulate randomly distribution of graphene nano sheets and carbon nano tubes in the resin, numerical modeling and analytical methods have been used. In this research to find a close simulation of hybrid nano-composite, first modeling stages have been done for every nano-composites of graphene/epoxy & CNT/epoxy with the same percentage of reinforcement particles that had been used in the samples, then the hybrid nano-composite’s creep strain has been estimated by the help of modeling results for every nanocomposites of graphene/epoxy & CNT/epoxy also Micromechanics relations considering percentage of the reinforcement particles. In FEM modeling, resin has been considered as a continues environment, then using continuum mechanics subject, equivalent structural beams for simulation atomic bonds (Covalent C-C) have been applied also in interphase area between carbon atoms of reinforcement particles and resin around them, the week Van der Waals bonds which have very important role in force transmission from resin to reinforcements have been considered by nonlinear spring element. The influence of randomly distribution of graphene nano sheets & CNTs in the matrix; has been applied by Micromechanics relations on the modeling results. By comparing modeling results for pure resin, nanocomposites and hybrid under creep test conditions with experimental results for such materials shows small difference, this confirms the accuracy of modeling method of creep strain.
Keywords:
Graphene, CNT/Epoxy Hybrid Nanocomposite-Creep Behavior’s FEM Modeling-Continum Mechanics-Van der Waals Forces
