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Structural Engineering and Mechanics Volume 14, Number 3, September 2002 , pages 245-262 DOI: https://doi.org/10.12989/sem.2002.14.3.245 |
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Free vibration analysis of stiffened laminated plates using layered finite element method |
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Guo MW, Harik IE
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| Abstract | ||
| The free vibration analysis of stiffened laminated composite plates has been performed using the layered (zigzag) finite element method based on the first order shear deformation theory. The layers of the laminated plate is modeled using nine-node isoparametric degenerated flat shell element. The stiffeners are modeled as three-node isoparametric beam elements based on Timoshenko beam theory. Bilinear in-plane displacement constraints are used to maintain the inter-layer continuity. A special lumping technique is used in deriving the lumped mass matrices. The natural frequencies are extracted using the subspace iteration method. Numerical results are presented for unstiffened laminated plates, stiffened isotropic plates, stiffened symmetric angle-ply laminates, stiffened skew-symmetric angle-ply laminates and stiffened skew-symmetric cross-ply laminates. The effects of fiber orientations (ply angles), number of layers, stiffener depths and degrees of orthotropy are examined. | ||
| Key Words | ||
| finite element method, free vibration, frequency, stiffened plates, laminated plates, composite, layered model | ||
| Address | ||
| Guo MW, Parsons Brinkckerhoff Inc, 510 1st Ave North,Suite 500, Minneapolis, MN 55403 USA Parsons Brinkckerhoff Inc, Minneapolis, MN 55403 USA Univ Kentucky, Dept Civil Engn, Lexington, KY 40506 USA Fuzhou Univ, Dept Civil Engn, Fuzhou 35002, Fujian Province, Peoples R China | ||