Finite Element Analysis of Laminated Composite Stiffened Shell

Abstract

Composite stiffened shells have been analysed with the help of two dif ferent elements—a nine-noded Lagrangian isoparametric element and the Heterosis ele ment. Both the elements have the advantages of accommodating curved boundaries and in corporating shear deformation. In the formulation, the stiffener need not be placed along the nodal line as it takes care of the placement of the stiffener anywhere within the shell element. This makes the modelling more flexible. Concentric and eccentric stiffened com posite shells have been analysed with the help of these two elements. The results obtained on the basis of these two have been compared. Parametric studies of the different variables have been conducted.

Local behavior of discretely stiffened composite plates and cylindrical shells

“…Note that there is a good agreement between the results of Ref. [23] and the current study. The displacements reported in Ref.…”

“…The same problem was originally solved by Goswami and Mukhopadhyay [23]. The composite cylinder is simply supported on all sides.…”

“…This produces an unsymmetrical complex displacement field which is a combination of membrane stretching, bending and out-of-plane distortion. The capability of the model developed in this study is well-tested by this particular bench-mark problem that has been solved by a number of researchers [22][23][24]. Figure 4 gives the geometric details of the shell and the stiffeners.…”

Transient finite element dynamic response of laminated composite stiffened shell

“…8where a 3 = (1 -oc)A? and a 4 = aAt All the operations above, except for Equations (7) and (8), can be carried at the element level, and the assembled form of Equation (4) can be obtained for the whole problem. The equation is then resolved for the global solution vector at time ; :…”

Free Vibration Analysis of Laminated Stiffened Cylindrical Panels Using Finite Element Method

“…Using the finite element model where stiffeners are modeled by beam finite elements, Mustafa and Ali [7] and Bardell and Mead [8] have presented the vibration analysis of orthogonally stiffened cylindrical shells. Goswami and Mukhopadhyay [9,10] studied deflection and free vibration of laminated stiffened composite panels by using the nine-noded Lagrangian element and heterosis element to model the shell and the stiffener. Employing eight-noded isoparametric quadratic element for the shell, three-noded curved beam element for the stiffener Prusty and Satsangi [11,12,13] investigated static, failure analysis and vibration characteristic of laminated composite stiffened panels based on first order shell theory.…”