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A study on the axial stresses of P-FGM, SFGM and E-FGM plates under pressure loading using the energy concept
, Article 27th Congress of the International Council of the Aeronautical Sciences 2010, ICAS 2010, 19 September 2010 through 24 September 2010, Nice ; Volume 3 , 2010 , Pages 2060-2068 ; 9781617820496 (ISBN) ; Abedian, A ; Sharif University of Technology
2010
Abstract
In this study the energy concept along with the classical plate theory (CPT), first and third order shear deformation theories (FSDT and TSDT) are used to predict the large deflection and through the thickness stresses of a FGM plate. For defining the volume fraction of the FGM constituent materials three different functions are considered; simple power-law (PFGM), exponential (E-FGM) and sigmoid (S_FGM) functions. Power-law and exponential functions are commonly used tocontrol the variations of properties of FGMs. However, with both functions, a stress concentration appears due to abruptchange of the volume fraction of the constituents. Therefore, a sigmoid FGM is used to define a new...
Displacement-based seismic design using energy concept
, Article 8th US National Conference on Earthquake Engineering 2006, San Francisco, CA, 18 April 2006 through 22 April 2006 ; Volume 4 , 2006 , Pages 1987-1996 ; 9781615670444 (ISBN) ; Bakhshi, A ; Sharif University of Technology
2006
Abstract
In this article, a new method for the seismic resistant design is introduced. At first some formulation necessary for the introduction of the proposed method is carried out. This new procedure directly deals with ductility and takes into account the amount of ultimate displacement and required strength interactively. This design procedure is verified by extensive numerical examples using some actual earthquake records. The procedure is shown to be completely safe and to reduce the amount of inherent conservatism. Moreover, it has been tried to introduce some applicable correction factors. Copyright © (2006) by Earthquake Engineering Research Institute
Response and Deflection Investigation of FGM Plates Under Thermo-mechanical Loads
, M.Sc. Thesis Sharif University of Technology ; Abedian, Ali (Supervisor)
Abstract
In the aerospace industry, there are a lot of high temperature environments, including engine parts and heat shields, in which the damages under these working conditions may be so destructive and even in some cases; they may result in sudden catastrophic failure of the structure. Nowadays, to prevent the occurrence of such failures and to provide the appropriate materials capable of working in such harsh environments and being able to protect the other adjacent structural components, new generation of thermal barrier coating materials so called Functionally Graded Materials (FGMs), with the controllable material properties in one or more directions were introduced. Recently, FGM applications...
Nonlinear analysis of FGM plates under pressure loads using the higher-order shear deformation theories
, Article Composite Structures ; Volume 89, Issue 3 , 2009 , Pages 333-344 ; 02638223 (ISSN) ; DehghanManshadi, B ; Abedian, A ; Sharif University of Technology
2009
Abstract
In this study, the energy concept along with the first- and third-order shear deformation theories (FSDT and TSDT) are used to predict the large deflection and through the thickness stress of FGM plates. These responses are studied and discussed as a function of plate thickness and the order "n" of a power law function which is considered for the through the thickness variation of the properties of the FGM plate. The results show that the energy method powered by the FSDT and FSDT is capable of predicting the effects of plate thickness on the deformation and the through the thickness stress. Here, also the effects of power "n" on the plate response is clearly depicted. Notably, the...