Available online at www.sciencedirect.com ScienceDirect Materials Today: Proceedings 5 (2018) 5313–5321 www.materialstoday.com/proceedings 2214-7853© 2017 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of 7th International Conference of Materials Processing and Characterization. ICMPC 2017 Free vibration analysis of Stiffened Laminated Plate using FEM Aishwary Singh Rajawat a , Avadesh K. Sharma b , Pranshu Gehlot c a Research Scholar, Madhav Institute of Technology & Science, Gwalior, 474005, India b Assistant Professor, Madhav Institute of Technology & Science, Gwalior, 474005, India c Research Scholar, Madhav Institute of Technology & Science, Gwalior, 474005, India Abstract This paper presents the free vibration analysis of stiffened laminated plate using Finite element method. Stiffened laminated plate are commonly employed in the structures of many aerospace vehicles such as aircrafts, rockets, missiles, etc. Therefore it is necessary to determine the structural deformation and vibrational characteristics of such structures where it is desired to have high natural frequencies. The free vibration results obtained by the present finite element model are compared with previous results for the stiffened composite plate. The result shows that the present model for the stiffened plate gives quite accurate results. Effects of the eccentricity, orientation- symmetric and anti-symmetric, angle-ply and cross-ply and boundary condition are also investigated. © 2017 Elsevier Ltd. All rights reserved. Selection and/or Peer-review under responsibility of 7th International Conference of Materials Processing and Characterization. Keywords:Vibration; FEM; Ansys; Modal analysis. 1. Introduction Nowadays, various composite plates are being employed in the structures of many aerospace, automotive and ship building industries. Composite materials have good properties- high strength-weight ratio, high stiffness-weight ratio, and high damping etc. In addition, if they exposed to a dynamic situation, these materials offers better dynamic responses than any other conventional material. The weight saving is also an important consideration for high performance applications and for this, it is necessary to minimize the maximum deflections of plates without introducing any considerable weight. This can be achieved by adding stiffeners to the plates to enhance their load- carrying capacity and also resists vibration due to dynamical loads. A number of papers on isotropic stiffened plates have been proposed. * Corresponding author. E-mail address : aishwarysinghrajawat06@gmail.com