The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Y. Benveniste - One of the best experts on this subject based on the ideXlab platform.
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The Saint-Venant torsion of a circular bar consisting of a Composite Cylinder assemblage with cylindrically orthotropic constituents
International Journal of Solids and Structures, 2003Co-Authors: Y. Benveniste, Tungyang ChenAbstract:We consider the Saint-Venant torsion of a cylindrical rod of a circular cross section which is filled up by an assemblage of Composite circular Cylinders. The constituent Cylinders consist of a core and a coating both of which are cylindrically orthotropic with the volume fraction of the core being the same in every Composite Cylinder. The described microstructure is the Composite Cylinder assemblage of Hashin and Rosen [J. Appl. Mech. 29 (1964) 143] which is now subjected to torsion. The main results are (a) the warping function on the lateral surface of the host rod is zero, (b) an exact expression for the torsional rigidity of the host rod is derived which depends on the size distribution of the Composite Cylinders but not on their position and (c) there are two circumstances in which the torsional rigidity becomes size distribution independent: The first one is that in which the sizes of the Composite Cylinders are much smaller than the size of the host rod; the second one is that in which a certain specific relation holds between the properties of the Composite Cylinder and the volume fraction of the core. If the coating disappears and the core is cylindrically orthotropic, we get the configuration of a polycrystalline rod. Simple bounds for the torsional rigidity of the constructed Composite rod are obtained.
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exact solutions in torsion of Composite bars thickly coated neutral inhomogeneities and Composite Cylinder assemblages
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2002Co-Authors: Tungyang Chen, Y. Benveniste, P C ChuangAbstract:The study of microgeometries amenable to exact solutions has been of considerable interest in the modern literature of Composite media. Although several such solutions exist today in the context of...
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magnetoelectric effect in fibrous Composites with piezoelectric and piezomagnetic phases
Physical Review B, 1995Co-Authors: Y. BenvenisteAbstract:Fibrous Composite systems characterized by a cylindrical microgeometry and consisting of a piezoelectric and a piezomagnetic phase with thermal effects are considered. These Composites exhibit a magnetoelectric effect that is not present in the constituents. Exact connections are derived between the effective moduli of such systems. These relations are independent of the details of the microgeometry and of the particular choice of the averaging model. In the case of overall transverse isotropy the Composite is characterized by twenty one constants. We show that there are sixteen connections for a subset of twenty effective moduli. Simple expressions are also derived for the effective constants of the Composite Cylinder assemblage microgeometry in such systems.
Zheng Ming Huang - One of the best experts on this subject based on the ideXlab platform.
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Flexural strength of a Composite Cylinder incorporated with thermal residual stresses
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2004Co-Authors: Zheng Ming HuangAbstract:Abstract Continuous fiber reinforced Composite Cylinders are frequently fabricated at higher than working temperatures and are used as a primary load-carrying element in general. The purpose of this paper is to investigate the ultimate bending strength of a polymer Composite Cylinder and to compare the estimated results with and without thermal residual stresses incorporated. In order to figure out the progressive bending failure process generated in the Cylinder, it is discretized into a number of lamina layers with different widths and is analyzed as a laminated structure. Whereas the failure of an individual lamina ply with combined flexural load and thermal residual stress effect can be understood in terms of the bridging microsmechanics model, a critical deflection condition has to be employed to determine the ultimate failure and thus the ultimate bending strength of the Cylinder. An experiment has been carried out to measure the load–deflection of a polymer Composite Cylinder subjected to three-point bending until ultimate failure. The measured results have been used as benchmark to validate the analysis accuracy. It has been found that the present thermal residual stresses only had a marginal effect on the later part of the load–deflection curve of the Composite Cylinder. By ignorance of them, however, the prediction was less accurate.
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ultimate strength of a Composite Cylinder subjected to three point bending correlation of beam theory with experiment
Composite Structures, 2004Co-Authors: Zheng Ming HuangAbstract:This paper investigates the ultimate bending response of a solid Composite Cylinder reinforced with uniaxially aligned continuous fibers. Experiments exhibited remarkable nonlinear load–deflections up to failure, indicating that a progressive failure process must have occurred in the Cylinder. Thus, the failure of the outmost filament initially subjected to the maximum bending stress does not correspond to the ultimate failure, and additional loads should be still applicable to the Cylinder. To reveal this progressive failure process, the Cylinder is discretized into a number of parallel layers of different widths. Each layer is considered as a unidirectional lamina, whose overall load component is determined within the framework of classical beam theory. However, the lamina nonlinearity has been incorporated in the analysis using an instantaneous stiffness element defined by the micromechanics bridging model. The benefit of this model is in that only the constituent fiber and matrix properties are required in the analysis. As neither the first ply nor the last ply failure corresponds to the ultimate failure, in addition to the stress failure criterion used to detect the failure of an individual ply another deformation related parameter must be also employed to govern the ultimate failure and then to determine the ultimate strength. In the present case when a 16 layers discretization has been employed, the predicted fourth ply failure strength has been found to work for the ultimate strength and to correlate reasonably well with the experimental counterpart.
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Flexural strength of a Composite Cylinder incorporated with thermal residual stresses
Materials Science and Engineering A, 2004Co-Authors: Zheng Ming HuangAbstract:Continuous fiber reinforced Composite Cylinders are frequently fabricated at higher than working temperatures and are used as a primary load-carrying element in general. The purpose of this paper is to investigate the ultimate bending strength of a polymer Composite Cylinder and to compare the estimated results with and without thermal residual stresses incorporated. In order to figure out the progressive bending failure process generated in the Cylinder, it is discretized into a number of lamina layers with different widths and is analyzed as a laminated structure. Whereas the failure of an individual lamina ply with combined flexural load and thermal residual stress effect can be understood in terms of the bridging microsmechanics model, a critical deflection condition has to be employed to determine the ultimate failure and thus the ultimate bending strength of the Cylinder. An experiment has been carried out to measure the load-deflection of a polymer Composite Cylinder subjected to three-point bending until ultimate failure. The measured results have been used as benchmark to validate the analysis accuracy. It has been found that the present thermal residual stresses only had a marginal effect on the later part of the load-deflection curve of the Composite Cylinder. By ignorance of them, however, the prediction was less accurate. © 2003 Elsevier B.V. All rights reserved.
Tungyang Chen - One of the best experts on this subject based on the ideXlab platform.
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The Saint-Venant torsion of a circular bar consisting of a Composite Cylinder assemblage with cylindrically orthotropic constituents
International Journal of Solids and Structures, 2003Co-Authors: Y. Benveniste, Tungyang ChenAbstract:We consider the Saint-Venant torsion of a cylindrical rod of a circular cross section which is filled up by an assemblage of Composite circular Cylinders. The constituent Cylinders consist of a core and a coating both of which are cylindrically orthotropic with the volume fraction of the core being the same in every Composite Cylinder. The described microstructure is the Composite Cylinder assemblage of Hashin and Rosen [J. Appl. Mech. 29 (1964) 143] which is now subjected to torsion. The main results are (a) the warping function on the lateral surface of the host rod is zero, (b) an exact expression for the torsional rigidity of the host rod is derived which depends on the size distribution of the Composite Cylinders but not on their position and (c) there are two circumstances in which the torsional rigidity becomes size distribution independent: The first one is that in which the sizes of the Composite Cylinders are much smaller than the size of the host rod; the second one is that in which a certain specific relation holds between the properties of the Composite Cylinder and the volume fraction of the core. If the coating disappears and the core is cylindrically orthotropic, we get the configuration of a polycrystalline rod. Simple bounds for the torsional rigidity of the constructed Composite rod are obtained.
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exact solutions in torsion of Composite bars thickly coated neutral inhomogeneities and Composite Cylinder assemblages
Proceedings of The Royal Society A: Mathematical Physical and Engineering Sciences, 2002Co-Authors: Tungyang Chen, Y. Benveniste, P C ChuangAbstract:The study of microgeometries amenable to exact solutions has been of considerable interest in the modern literature of Composite media. Although several such solutions exist today in the context of...
R Heyd - One of the best experts on this subject based on the ideXlab platform.
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study of heat conduction through a self heated Composite Cylinder by laplace transfer functions
Applied Mathematical Modelling, 2016Co-Authors: Mohamed Lotfi, Lassaad Mezrigui, R HeydAbstract:Abstract A study of heat conduction through a Composite Cylinder showing large differences in scale is presented. The system consists of a thin electrically conductive sensing layer, subjected to Joule self-heating and placed in thermal contact with an inner core and an outer concentric cylindrical sheath. The formalism of Laplace transfer functions is used to relate the operating temperature of the sensing layer to the unknown outermost temperature, to the Joule self-heating and to the thermal contact resistances. Analytical expressions for the overheating temperatures are deduced from these transfer functions. Digital filters are derived from the Laplace transfer functions by using Pade approximants and a bilinear transformation. The real-time direct and inverse heat conduction problems are solved without resorting to Laplace inversion, but rather by using the recursion relations associated with the Pade digital filters. This method allows one to easily solve the problems of heat conduction through a self-heated Composite Cylinder, even in the nonlinear case of a temperature dependent source term. This approach could be applied to optimize and accurately describe the operation of commonly used wire-wound resistance temperature detectors.
R W Mccoy - One of the best experts on this subject based on the ideXlab platform.
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fluid structure interaction analysis of a thick section Composite Cylinder subjected to underwater blast loading
Composite Structures, 1997Co-Authors: R W MccoyAbstract:Abstract The dynamic response of a thick-section hollow Composite Cylinder, under plane-strain conditions, subjected to an external blast loading, with and without fluid-coupling effects, was investigated using finite-element analysis and effective modulus theory. The blast loading profile is representative of the primary pressure pulse created by an underwater explosion occurring far from the Cylinder. In this analysis, fluid-structure-coupling effects were included by employing a loading routine in the finite-element analysis. A plane incident pressure wave impacting the Cylinder and propagating around it with a fixed velocity, was considered. The effects of reflected and radiated pressure components were included. The accuracy of effective modulus theory in dynamic stress analysis was briefly explored. A commercial finite-element code, ABAQUS, was used for this analysis.