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A note on buckling and vibration of clamped orthotropic plates under in-plane loads
Felix, D.H.,Bambill, D.V.,Rossit, C.A. Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.1
The present work deals with obtaining the critical buckling load and the natural frequencies of clamped, orthotropic, rectangular thin plates subjected to different linear distributed in-plane forces. An analytical solution is proposed. Using the Ritz method, the dependence between in-plane forces and natural frequencies are estimated for various plate sizes, and some results are compared with finite element solutions and where possible, comparison is made with previously published results. Beam functions are used as admissible functions in the Ritz method.
A note on buckling and vibration of clamped orthotropic plates under in-plane loads
D.H. Felix,D.V. Bambill,C.A. Rossit 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.1
The present work deals with obtaining the critical buckling load and the natural frequencies of clamped, orthotropic, rectangular thin plates subjected to different linear distributed in-plane forces. An analytical solution is proposed. Using the Ritz method, the dependence between in-plane forces and natural frequencies are estimated for various plate sizes, and some results are compared with finite element solutions and where possible, comparison is made with previously published results. Beam functions are used as admissible functions in the Ritz method.
Vibration analysis of rotating Timoshenko beams by means of the differential quadrature method
D.V. Bambill,D.H. Felix,R.E. Rossi 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.2
Vibration analysis of rotating beams is a topic of constant interest in mechanical engineering. The differential quadrature method (DQM) is used to obtain the natural frequencies of free transverse vibration of rotating beams. As it is known the DQM offers an accurate and useful method for solution of differential equations. And it is an effective technique for solving this kind of problems as it is shown comparing the obtained results with those available in the open literature and with those obtained by an independent solution using the finite element method. The beam model is based on the Timoshenko beam theory.
Vibration analysis of rotating Timoshenko beams by means of the differential quadrature method
Bambill, D.V.,Felix, D.H.,Rossi, R.E. Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.2
Vibration analysis of rotating beams is a topic of constant interest in mechanical engineering. The differential quadrature method (DQM) is used to obtain the natural frequencies of free transverse vibration of rotating beams. As it is known the DQM offers an accurate and useful method for solution of differential equations. And it is an effective technique for solving this kind of problems as it is shown comparing the obtained results with those available in the open literature and with those obtained by an independent solution using the finite element method. The beam model is based on the Timoshenko beam theory.
N. Al Saqri,J.F. Felix,M. Aziz,D. Jameel,C.I.L. de Araujo,H. Albalawi,F. Al Mashary,H. Alghamdi,D. Taylor,M. Henini 한국물리학회 2015 Current Applied Physics Vol.15 No.10
This work reports the effect of gamma (γ-) irradiation on dilute GaAsN with nitrogen concentrations ranging from 0.2 to 1.2% with post-irradiation stability using CurrenteVoltage (I-V) and Deep Level Transient Spectroscopy (DLTS) measurements in the temperature range from 10 K to 450 K. The IeV results indicate that the irradiation effect was more pronounced in the samples with nitrogen concentration of 0.4%. Additionally, the irradiated samples showed an ideality factor higher than the as-grown samples. On the other hand, for temperatures above 265 K the barrier height of the irradiated samples with 0.8% nitrogen is higher than the as-grown samples. The DLTS measurements revealed that after irradiation the number of traps either decreased remained constant, or new traps are created depending on the concentration of nitrogen. For samples with N = 0.2% - 0.4% the number of traps after irradiation decreased, whereas for samples with N = 0.8% - 1.2 % the number of traps remained the same. However, the properties of some traps such as capture cross-sections and density increased by about 2 orders of magnitude. The origin of the defects present before and after irradiation are discussed and correlated.