A triangular composite stiffened plate/shell element is developed to analyze the advanced grid stiffened (AGS) structures based on Mindlin shear deformation theory. The rotations of ribs and skin are interpolated, respectively, while the conditions of displacement compatibility are satisfied along the interface of rib and skin. There are no restrictions on the number, positions, and orientation of the ribs in establishing element mesh. The numerical results indicate its effectiveness, especially for the case of the AGS structures of higher ribs. Stability analyses for an ortho-grid plate and iso-grid cylindrical shell are also carried out.
Vasiliev, V.V. , Barynin, V.A. and Rasin, A.F. (2001). Anisogrid Lattice Structures Survey of Development and Application, Composite Structures , 54: 361-370.
2.
Chen, H.J. and Tsai, S.W. ( 1996). Analysis and Optimum Design of Composite Grid Structures , Journal of Composite Materials, 30(4): 503-533.
3.
Jaunky, N., Knight, N.F. and Ambur, D.R. ( 1998). Optimal Design of General Stiffened Composite Circular Cylinders for Global Buckling with Strength Constraints, Composite Structures, 41: 243-252.
4.
Wodesenbet, E., Kidane, S. and Pang, S.S. (2003). Optimization for Buckling Loads of Grid Stiffened Composite Panels, Composite Structures , 60: 159-169.
5.
Guo, M.W. , Harik, I.E. and Ren, W.X. (2002). Buckling Behavior of Stiffened Laminated Plates, International Journal of Solids and Structures, 39: 3099-3055.
6.
Chen, H.R., Wang, M. and Bai, R.X. ( 2006). The Effect of Nonlinear Contact Upon Natural Frequency of Delaminated Stiffened Composite Plate, Composite Structures , 76: 28-33.
7.
Yap, J.W.H. , Scott, M.L., Thomson, R.S. and Hachenberg , D. (2002). The Analysis of Skin-to-Stiffener Debonding in Composite Aerospace Structures , Composite Structures, 57: 425-435.
8.
Kolli, M. and Chandrashekhara, K. ( 1996). Finite Element Analysis of Stiffened Laminated Plates under Transverse Loading, Composites Science and Technology , 56: 1335-1361.
9.
Kassegne, S.K. and Reddy, J.N. (1998). Local Behavior of Discretely Stiffened Composite Plates and Cylindrical Shells, Composite Structures, 41: 13-26.
10.
Holopalnen, T.P. (1995). Finite Element Free Vibration Analysis of Eccentrically Stiffened Plates, Computers and Structures, 56(6): 993-1007.
11.
Kumar, Y.V.S. and Mukhopadhyay, M. (2000). A New Triangular Stiffened Plate Element for Laminate Analysis, Composites Science and Technology, 60: 935-943.
12.
Chen, W.J. and Cheung, Y.K. ( 2001). Refined 9-DOF Triangular Mindlin Plate Elements, International Journal for Numerical Methods in Engineering, 51: 1259-1281.
Zienkiewicz, O.C. and Taylor, R.L. (1991). The Finite Element Method, 4th edn, Mcgraw-Hill Book Co., London.
15.
Rossow, M.P. and Ibrahimkhail, A.K. (1978). Constraint Method Analysis of Stiffened Plates, Composite Structures, 8: 51-60.
16.
Jaunky, N., Norman, F.K. and Damodar, R.A. ( 1996). Formulation of an Improved Smeared Stiffener Theory for Buckling Analysis of Grid-stiffened Composite Panels, Composites Part B, 27(5): 519-526.
17.
Anonymous ( 1987). DIAL Finite Element Analysis System - Version L3D2. Locheed Missiles and Space Company.
18.
Huang, Y. ( 1987). Analysis of General Instability for Composite Cylindrical Shell Stiffened with Triangular Ribs, Acta Materiae Compositae Sinica, 4(1): 25-31.
19.
Gan, C., Gibson, R.F. and Newaz, G.M. ( 2004). Analytical/Experimental Investigation of Energy Absorption in Grid-stiffened Composite Structures under Transverse Loading, Experimental Mechanics, 44(2): 185-194.
