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Enhanced first order shear deformation theory for fully coupled electro-thermo-mechanical smart laminated plates
A first-order shear deformation theory is adequate to predict the global behavior. However, it cannot predict accurate deformation and stress distribution through the thickness of laminated plates. Thus for the accurate prediction of detailed stress and deformation distributions through the thickness, higher order zigzag theories have been proposed. However, in the most cases, simplified zigzag higher order theory requires C1 shape functions in finite element implementation. In commercial FE softwares, C 1 shape functions are not so common in plate and shell analysis. Thus zigzag theories are useful for the highly accurate prediction of thick composite behaviors but they are not practical in the sense that they cannot be used conveniently in the commercial package. In practice, the first order shear deformable Reissner-Mindlin plate theory is the standard model for the analysis and design of composite laminated plates and shells. Thus in the present study, an enhanced first order shear deformation theory is developed. The proposed theory requires only C 0 shape function in FE implementation because it is based on the standard Reissner-Mindlin plate theory. The least-squared energy error between the first order theory and higher order theory is minimized. An enhanced first deformation theory(EFSDT) in this paper is proposed for smart structure under complex loadings. The EFSDT is constructed by the strain energy transformation and fully coupled mechanical, electric, and thermal loading cases are studied. In order to obtain accurate prediction, zigzag in-plane displacement and transverse normal deformation are considered in the deformation field. In the electric behavior, open-circuit condition as well as closed-circuit condition is considered. Through the numerous examples, the accuracy and robustness of present theory are demonstrated.
Enhanced first order shear deformation theory for fully coupled electro-thermo-mechanical smart laminated plates
A first-order shear deformation theory is adequate to predict the global behavior. However, it cannot predict accurate deformation and stress distribution through the thickness of laminated plates. Thus for the accurate prediction of detailed stress and deformation distributions through the thickness, higher order zigzag theories have been proposed. However, in the most cases, simplified zigzag higher order theory requires C1 shape functions in finite element implementation. In commercial FE softwares, C 1 shape functions are not so common in plate and shell analysis. Thus zigzag theories are useful for the highly accurate prediction of thick composite behaviors but they are not practical in the sense that they cannot be used conveniently in the commercial package. In practice, the first order shear deformable Reissner-Mindlin plate theory is the standard model for the analysis and design of composite laminated plates and shells. Thus in the present study, an enhanced first order shear deformation theory is developed. The proposed theory requires only C 0 shape function in FE implementation because it is based on the standard Reissner-Mindlin plate theory. The least-squared energy error between the first order theory and higher order theory is minimized. An enhanced first deformation theory(EFSDT) in this paper is proposed for smart structure under complex loadings. The EFSDT is constructed by the strain energy transformation and fully coupled mechanical, electric, and thermal loading cases are studied. In order to obtain accurate prediction, zigzag in-plane displacement and transverse normal deformation are considered in the deformation field. In the electric behavior, open-circuit condition as well as closed-circuit condition is considered. Through the numerous examples, the accuracy and robustness of present theory are demonstrated.
Enhanced first order shear deformation theory for fully coupled electro-thermo-mechanical smart laminated plates
Oh, Jinho (author) / Cho, Maenghyo (author) / Kim, Jun-Sik (author)
2006
14 Seiten, 21 Quellen
Conference paper
English
elektrische Eigenschaft , elektrische Steuerung , Finite-Elemente-Methode , intelligenter Werkstoff , mechanische Spannungsverteilung , Platte (Bauteil) , Scherbeanspruchung , Schichtwerkstoff , Spannungsanalyse , theoretisches Modell , thermomechanische Eigenschaft , Verbundplatte , Verformung unter Last
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