15913

14209

كارشناسي ارشد

طراحي جامدات

اصفهان : دانشگاه صنعتي اصفهان

1399

دوازده،81 ص.: مصور، جدول، نمودار

مهران مرادي

محمد سيلاني

مصطفي جمشيديان، مهدي جوانبخت

1399/08/03

كتابنامه

مكانيك

مهندسي مكانيك

1399/08/03

2628622

In plane vibrational analysis of single layer graphene sheet by scaled boundary finite element Mohammad Jannesari hama jannesary@gmail com January 9 2017 Department of Mechanical Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree Master of Science Language FarsiSupervisor mehran moradi assist Prof moradi@iut ac ir AbstractToday vibration analysis has proven to be one of the most important tools in the maintenance of mechanical andelectronic equipment Vibration and frequency analysis can be used to predict the behavior of materials usedin mechanical and electronic devices Graphene sheets are also widely used in the manufacture of nanosensorsand resonators so it is important to study the frequency and vibration behavior of nano graphene sheets In thisresearch an attempt is made to use the scaled boundary finite element method to analyze the frequency andvibration of the graphene sheets This method is one of the newest numerical methods that has been consideredin recent years due to its special features The scaled boundary finite element method has the advantages of boththe boundary finite element and finite element methods but is currently less commonly used at the nanoscale Inthis research for the first time this method at the nanoscale has been used to analyze the frequency and vibra tion of nano graphene plates For this purpose hexagonal elements corresponding to the honeycomb structureof graphene were used Equivalent energy criteria were also used in the simulation In this study the results ofvibrational and frequency analysis were presented using the scaled finite element method in different boundaryconditions for single layer graphene and different molecular orientations at in plane degrees of freedom Thetransient response of the graphene sheet to the harmonic concentric load was also studied The results are ingood agreement with the results of molecular dynamics and finite element methods and show that the naturalfrequencies of the system decrease with increasing model dimensions It was also observed that the orientationof the molecules in the two directions of the armchair handle and the zigzag does not have much effect on thenatural frequencies of the system Vibration analysis was also applied to the graphene nanoribbons under con centrated load for cantilevered and bridged boundary conditions at the applied harmonic load with frequenciesof 10 and 100 GHz which showed more displacement in the cantilevered state than in the bridged state Also regarding the orientation of the molecules in the two directions of the armchair handle and the zigzag a signif icant increase in the maximum displacement in the zigzag mode can be observed compared to the direction ofthe armchair handle at a frequency of 100 GHz KeywordsNano Graphen Energy equivalent model Scaled bouandary Finite Element Method Frequency Analysis Vi bration Analysis

مهران مرادي

محمد سيلاني

مصطفي جمشيديان، مهدي جوانبخت