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Mohammad Reza Eslami - One of the best experts on this subject based on the ideXlab platform.
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Thermal buckling of piezoelectric functionally graded Material deep spherical shells
Journal of Strain Analysis for Engineering Design, 2014Co-Authors: Mostafa Sabzikar Boroujerdy, Mohammad Reza EslamiAbstract:Thermal instability of deep spherical shells made of functionally graded Material and surface-bonded piezoelectric actuators is studied in this article. The governing equations are based on the classical shell theory and the Sanders nonlinear kinematic equations. It is assumed that the property of the functionally graded Materials varies continuously through the thickness of the shell, according to a power law distribution of the volume fraction of the Constituent Materials. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings and constant applied actuator voltage. Results for simpler states are validated with the known data in the literature. © IMechE 2013.
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Thermal buckling of piezoelectric functionally graded Material deep spherical shells
Journal of Strain Analysis for Engineering Design, 2013Co-Authors: Mostafa Sabzikar Boroujerdy, Mohammad Reza EslamiAbstract:Thermal instability of deep spherical shells made of functionally graded Material and surface-bonded piezoelectric actuators is studied in this article. The governing equations are based on the classical shell theory and the Sanders nonlinear kinematic equations. It is assumed that the property of the functionally graded Materials varies continuously through the thickness of the shell, according to a power law distribution of the volume fraction of the Constituent Materials. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings and constant applied actuator voltage. Results for simpler states are validated with the known data in the literature.
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Thermal buckling of piezo-FGM shallow spherical shells
Meccanica, 2013Co-Authors: Mostafa Sabzikar Boroujerdy, Mohammad Reza EslamiAbstract:Thermal instability of shallow spherical shells made of functionally graded Material (FGM) and surface-bonded piezoelectric actuators is studied in this paper. The governing equations are based on the first order theory of shells and the Sanders nonlinear kinematics equations. It is assumed that the property of the functionally graded Materials vary continuously through the thickness of the shell according to a power law distribution of the volume fraction of the Constituent Materials. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings and constant applied actuator voltage. Results for simpler states are validated with the known data in literature.
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Thermal instability of functionally graded deep spherical shell
Archive of Applied Mechanics, 2011Co-Authors: R. Shahsiah, Mohammad Reza Eslami, Mostafa Sabzikar BoroujerdyAbstract:Thermal instability of deep spherical shells made of functionally graded Material (FGM) is studied in this paper. The governing equations are based on the first-order theory of shells and the Sanders nonlinear kinematics equations. It is assumed that the mechanical properties are linear functions of thickness coordinate. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings including the uniform temperature rise (UTR), the linear radial temperature (LRT), and the nonlinear radial temperature (NRT). Results are validated with the known data in literature.
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Thermal Instability of Functionally Graded Shallow Spherical Shell
Journal of Thermal Stresses, 2006Co-Authors: R. Shahsiah, Mohammad Reza Eslami, R. NajAbstract:In this paper, thermal instability of shallow spherical shells made of functionally graded Material (FGM) is considered. The governing equations for a thin spherical shell based on the Donnell?Mushtari?Vlasov theory are obtained. The equations are derived using the Sanders simplified kinematic relations and variational method. It is assumed that the mechanical properties vary linearly through the shell thickness. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. Analytical solutions are obtained for three types of thermal loading including Uniform Temperature Rise (UTR), Linear Radial Temperature (LRT), and Nonlinear Radial Temperature (NRT). The results are validated with the known data in the literature. Communicated by Theodore R. Tauschert on September 1, 2005.
Mostafa Sabzikar Boroujerdy - One of the best experts on this subject based on the ideXlab platform.
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Thermal buckling of piezoelectric functionally graded Material deep spherical shells
Journal of Strain Analysis for Engineering Design, 2014Co-Authors: Mostafa Sabzikar Boroujerdy, Mohammad Reza EslamiAbstract:Thermal instability of deep spherical shells made of functionally graded Material and surface-bonded piezoelectric actuators is studied in this article. The governing equations are based on the classical shell theory and the Sanders nonlinear kinematic equations. It is assumed that the property of the functionally graded Materials varies continuously through the thickness of the shell, according to a power law distribution of the volume fraction of the Constituent Materials. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings and constant applied actuator voltage. Results for simpler states are validated with the known data in the literature. © IMechE 2013.
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Thermal buckling of piezo-FGM shallow spherical shells
Meccanica, 2013Co-Authors: Mostafa Sabzikar Boroujerdy, Mohammad Reza EslamiAbstract:Thermal instability of shallow spherical shells made of functionally graded Material (FGM) and surface-bonded piezoelectric actuators is studied in this paper. The governing equations are based on the first order theory of shells and the Sanders nonlinear kinematics equations. It is assumed that the property of the functionally graded Materials vary continuously through the thickness of the shell according to a power law distribution of the volume fraction of the Constituent Materials. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings and constant applied actuator voltage. Results for simpler states are validated with the known data in literature.
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Thermal instability of functionally graded deep spherical shell
Archive of Applied Mechanics, 2011Co-Authors: R. Shahsiah, Mohammad Reza Eslami, Mostafa Sabzikar BoroujerdyAbstract:Thermal instability of deep spherical shells made of functionally graded Material (FGM) is studied in this paper. The governing equations are based on the first-order theory of shells and the Sanders nonlinear kinematics equations. It is assumed that the mechanical properties are linear functions of thickness coordinate. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings including the uniform temperature rise (UTR), the linear radial temperature (LRT), and the nonlinear radial temperature (NRT). Results are validated with the known data in literature.
Jason Ingham - One of the best experts on this subject based on the ideXlab platform.
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Constituent Material properties of new zealand unreinforced stone masonry buildings
Journal of building engineering, 2015Co-Authors: Marta Giaretton, Dmytro Dizhur, Francesca Da Porto, Jason InghamAbstract:Abstract Most of New Zealand's stone unreinforced masonry (URM) building stock was constructed between 1860 and 1910 by early European settlers, with approximately 670 stone URM buildings remaining throughout the country. These buildings are typically classified as earthquake-prone, indicating that they require seismic strengthening in order to avoid demolition as a seismic hazard. Practitioners and industry professionals currently lack knowledge about the traditional construction techniques used for these buildings, and about suitable methods for improving their seismic performance. To address this knowledge gap, research was conducted to classify the Constituent Materials used in the original construction and to document the mechanical and physical characteristics of these construction Materials. Extraction of structural mortar and natural stone samples was undertaken in six buildings that were deemed to be representative of the New Zealand stone URM building stock, and X-Ray Powder Diffraction (XRPD) and petrographical analyses were performed on these samples respectively in order to identify mineral composition and their original source location. In addition, the compressive strength of extracted Material samples was determined. A database of New Zealand natural stones that were typically used by the early European settlers in construction, including the source and compressive strength of each stone sub-type, is summarised herein. The presented data is intended to facilitate the selection of compatible Materials and suitable techniques for repair and seismic retrofit of vintage stone URM buildings.
J.g. Hubrig - One of the best experts on this subject based on the ideXlab platform.
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An alternative methodology for thermoset resin dielectric insulation Material insertion and electrical apparatus life cycle predictability
Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316), 2002Co-Authors: J.g. HubrigAbstract:The successful insertion of an epoxy formulation into an advanced dielectric insulation system may be characterized as an expression of a complex, interactive set of properties and processing parameters; from raw Material selection to design configuration. This expression represents the electrical apparatus as a set of structure and component design configurations ordered by assembly methodology to meet a given set of operating life cycle performance specifications. When reduced to their lowest common denomination; the electrical apparatus structure and component design configurations become an expression of interdependent Material generic properties; while assembly methodology and operating life cycle performance specifications are reduced to an expression of progressive sets of ambient exposures. This programmatic approach redefines electrical apparatus into a weighted matrix expression of: (1) design configuration Constituent Material generic properties and their requisite handling parameters; (2) design configuration requisite assembly processing parameters; (3) operating life cycle performance specifications; (4) known Constituent Material generic property degradation profiles; and (5) electrical apparatus root cause failure history. This matrix expression represents an alternative methodology that will facilitate the timely insertion of new Materials into advanced systems and will predict the in-service operating performance of an electrical apparatus while greatly reducing the expense and reliance on full-scale modeling and prototype development.
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Managing thermoset resin dielectric insulation failure mechanisms to achieve electrical apparatus life extension
Proceedings: Electrical Insulation Conference and Electrical Manufacturing and Coil Winding Conference (Cat. No.01CH37264), 2001Co-Authors: J.g. HubrigAbstract:Contemporary thermoset resin dielectric insulations function as complex Material systems; using raw Materials selected for their contributive property performance towards a set of physical, electrical and chemical in-service operating parameters defined by the electrical apparatus application. Whether the desired property values of these raw Materials are realized and maintained, as a dielectric insulation, is the result of an interactive dependency between: (1) raw Material sensitivity to processing variables during manufacture of the thermoset resin system; (2) the thermoset resin's key handling and processing parameters required to achieve optimum cured property performance; and (3) the suitability of the thermoset resin system's handling and processing parameters as a function of the electrical apparatus' design configuration and assembly methodology. This interactive dependency provides for the expression of dielectric insulation operating performance as a function, of electrical apparatus design configuration and manufacturing methodology. When linked through root cause failure analyses with Constituent Material properties and known Material property degradation profiles; the Material selection and manufacturing process baseline required to achieve and maintain optimum dielectric insulation performance is established.
R. Shahsiah - One of the best experts on this subject based on the ideXlab platform.
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Thermal instability of functionally graded deep spherical shell
Archive of Applied Mechanics, 2011Co-Authors: R. Shahsiah, Mohammad Reza Eslami, Mostafa Sabzikar BoroujerdyAbstract:Thermal instability of deep spherical shells made of functionally graded Material (FGM) is studied in this paper. The governing equations are based on the first-order theory of shells and the Sanders nonlinear kinematics equations. It is assumed that the mechanical properties are linear functions of thickness coordinate. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. The analytical solutions are obtained for three types of thermal loadings including the uniform temperature rise (UTR), the linear radial temperature (LRT), and the nonlinear radial temperature (NRT). Results are validated with the known data in literature.
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Thermal Instability of Functionally Graded Shallow Spherical Shell
Journal of Thermal Stresses, 2006Co-Authors: R. Shahsiah, Mohammad Reza Eslami, R. NajAbstract:In this paper, thermal instability of shallow spherical shells made of functionally graded Material (FGM) is considered. The governing equations for a thin spherical shell based on the Donnell?Mushtari?Vlasov theory are obtained. The equations are derived using the Sanders simplified kinematic relations and variational method. It is assumed that the mechanical properties vary linearly through the shell thickness. The Constituent Material of the functionally graded shell is assumed to be a mixture of ceramic and metal. Analytical solutions are obtained for three types of thermal loading including Uniform Temperature Rise (UTR), Linear Radial Temperature (LRT), and Nonlinear Radial Temperature (NRT). The results are validated with the known data in the literature. Communicated by Theodore R. Tauschert on September 1, 2005.