Thermal effects on nonlinear vibration of a carbon nanotube-based mass sensor using finite element analysis

2017 ◽  
Vol 85 ◽  
pp. 125-136 ◽  
Author(s):  
Dong-Keun Kang ◽  
Chang-Wan Kim ◽  
Hyun-Ik Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Nanotube ◽  
Nonlinear Vibration ◽  
Thermal Effects ◽  
Mass Sensor ◽  
Element Analysis

scholarly journals Finite Element Analysis of Thermal Effects in Diode End-Pumped Solid-State Lasers

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Moustafa Sayem El-Daher
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Solid State ◽  
Thermal Effects ◽  
Beam Quality ◽  
Focal Length ◽  
Thermal Lensing ◽  
Solid State Lasers ◽  
Element Analysis ◽  
Composite Crystals

Thermal effects are the main obstacle to getting high power and good beam quality in diode end-pumped solid-state lasers. In this work, a theoretical investigation of thermal effects in single and dual end-pumped solid-state lasers is carried out using finite element analysis (FEA) for a selected number of widely used laser producing materials, namely, Nd:YAG, Yb:YAG, and Nd:KGW. Crystals with different dimensions are also investigated both in single and in dual end-pumped configuration. Finally, the effect of using composite crystals on thermal lensing is investigated. An experiment to measure the thermal focal length for two different crystals was carried out and a comparison with FEA computed focal length of the thermal lens is made. In all cases studied in this work, results show clear effects of thermal lensing with some differences depending on crystal type, pump power, and size.

Molecular Mechanics Based Finite Element for Carbon Nanotube Modeling

2006 ◽  
Author(s):  
Theodosios C. Theodosiou ◽  
Dimitris A. Saravanos
Keyword(s):  
Carbon Nanotubes ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Carbon Nanotube ◽  
Molecular Mechanics ◽  
Potential Model ◽  
Element Analysis ◽  
Molecular Potential ◽  
Theoretical Predictions ◽  
Semi Empirical

In this paper a new method is introduced for carbon nanotubes modeling. It combines features of Molecular Mechanics and Finite Element Analysis. This method is based on the development of a new finite element, whose internal energy is determined by the semi-empirical Brenner molecular potential model; all quantities are calculated analytically in order to gain more accuracy. The method is validated through comparisons to results provided by other researchers and are obtained either by experimental procedures or theoretical predictions. The bending and shearing of CNTs is also simulated.

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