Research Article

Effect of lamination schemes on natural frequency and modal damping of fiber reinforced laminated beam using Ritz method

¹ National Institute of Technology Karnataka Surathkal, Mangalore 575 025, India
² Vignan's Institute of Information Technology, Visakhapatnam, Andhra Pradesh 530051, India
³ Vellore Institute of Technology Chennai, Tamilnadu 600 127, India
⁴ Aditya Engineering College, Surampalem, Andhra Pradesh, India

^* e-mail: bnaidus@gmail.com

Received: 8 January 2021
Accepted: 6 August 2021

Abstract

The current study focussed on analysing natural frequency and damping of laminated composite beams (LCBs) by varying fiber angle, aspect ratio, material property and boundary conditions. Ritz method with displacement field based on the shear and normal deformable theory is used and the modal damping is calculated using modal strain energy method. Effects of symmetric angle-ply and cross-ply, anti symmetric cross-ply, balanced and quasi-isotropic lay up schemes on modal damping are presented for the first time. Results revealed that influence of lay-up scheme on natural frequencies is significant for the thin beams while the modal damping of the thin beams are not sensitive to lay-up scheme. However, the lay-up scheme influences the damping significantly for the thick beams. Similarly, high strength fiber reinforced LCBs have higher natural frequency while low strength fiber reinforced LCBs have higher damping due to the better fiber-matrix interaction.