Showing papers by "M. Ganapathi published in 2002"
TL;DR: In this paper, the static and dynamic characteristics of thick composite laminates exposed to hygrothermal environment are studied using a realistic higher-order theory developed recently, which accounts for the nonlinear variation of the in-plane and transverse displacements through the thickness, and abrupt discontinuity in slope of inplane displacements at any interface.
192 citations
TL;DR: In this article, a dynamic analysis of laminated cross-ply composite non-circular thick cylindrical shells subjected to thermal/mechanical load is carried out based on higher-order theory.
44 citations
TL;DR: In this paper, the effects of higher-order theory, that accounts for the realistic variation of in-plane and transverse displacements through the thickness, on the modal loss factors and natural frequencies of thick composite laminated/sandwich plates, have been studied.
Abstract: In this paper, the effects of higher-order theory, that accounts for the realistic variation of in-plane and transverse displacements through the thickness, on the modal loss factors and natural frequencies of thick composite laminated/sandwich plates, have been studied. The formulation is based on finite element procedure using C0 eight-noded quadrilateral plate element. Further, the complex modulus of an orthotropic lamina is employed to model the damping effect. The significance of various higher-order terms considered in the model in predicting the vibration and damping characteristics are shown through the numerical studies. A detailed parametric study is also carried out to highlight the influences of ply-angle, aspect ratio, number of layers, and core to face thickness ratio for sandwich laminates on frequencies and system loss factors of composite laminates/sandwich plates.
29 citations
TL;DR: In this paper, the dynamic response characteristics of cross-ply laminated composite cylindrical shells are studied using a higher-order displacement model, which accounts for the nonlinear variation of the in-plane and transverse displacements through the thickness, and abrupt discontinuity in slope of inplane displacements at any interface.
Abstract: Here, the dynamic response characteristics of thick cross-ply laminated composite cylindrical shells are studied using a higher-order displacement model. The formulation accounts for the nonlinear variation of the in-plane and transverse displacements through the thickness, and abrupt discontinuity in slope of the in-plane displacements at any interface. The effect of inplane and rotary inertia terms is included. The analysis is carried out using finite element approach. The influences of various terms in the higher-order displacement field on the free vibrations, and transient dynamic response characteristics of cylindrical composite shells subjected to thermal and mechanical loads are analyzed.
12 citations
TL;DR: In this paper, a cubic B-spline plate element is developed using field consistency principle, for vibration analysis, which includes anisotropy, transverse shear deformation, in-plane and rotary inertia effects.
Abstract: Here, a new cubic B-spline plate element is developed using field consistency principle, for vibration analysis. The formulation includes anisotropy, transverse shear deformation, in-plane and rotary inertia effects. The element is based on a laminated refined plate theory, which satisfies the interface transverse shear stress and displacement continuity, and has a vanishing shear stress on the top and bottom surfaces of the plates. The lack of consistency in the shear strain field interpolations in its constrained physical limits produces poor convergence and results in unacceptable solutions due to locking phenomenon. Hence, numerical experimentation for the evaluation of natural frequencies of plates is carried out to check this deficiency with a series of assumed shear strain functions, redistributed in a field consistent manner.
1 citations
07 Aug 2002
TL;DR: The design of this new finite element involves field variable and its derivatives as degrees of freedom compared to the standard Lagrangian polynomial based finite element available in the literature, which leads to significant saving in CPU time and memory requirements.
Abstract: The finite element method allows one to solve large-scale, complex electromagnetic problems. It is also highly amenable to automation. Here, a numerical solution based on third-order C/sup 1/ triangular finite element is proposed for solving 2D electromagnetic field problems. The design of this new finite element involves field variable and its derivatives as degrees of freedom compared to the standard Lagrangian polynomial based finite element available in the literature. The performance/effectiveness of the present method is studied against that of standard element. For almost same accuracy, the number of equations to be handled based on present formulation reduces to less than half of those of standard element, which, in turn, leads to significant saving in CPU time and memory requirements.
1 citations