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Journal of Reinforced Plastics and Composites
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Failure Analysis of Laminated Composite Pretwisted Rotating Plates

A. Karmakar

Mechanical Engineering Department, Jadavpur University, Calcutta 700032, India

P. K. Sinha

Aerospace Engineering Department, Indian Institute of Technology, Kharagpur 721302, India. pksinha{at}aero.iitkgp.ernet.in

In this paper a finite element computational procedure is presented for the determination of first-ply failure strengths of pretwisted rotating plates subjected to centre point transverse load. The finite element model is based on the tensor polynomial failure criterion that contains the maximum stress, maximum strain, Tsai-Hill, Tsai-Wu and Hoffman failure criteria as special cases. A nine-noded three-dimensional degenerated composite shell element is developed and used for the present finite element formulation. Effects of transverse shear deformation and rotary inertia are included. Lagrange's equation of motion is employed to derive the dynamic equilibrium equation considering moderate rotational speeds for which the Coriolis effect is negligible. Finally, the static equilibrium equation is formulated after discarding the time-dependent terms. Failure load computations for rotating cantilever plates with nonlinear pretwist are carried out to investigate the effects of angle of twist, rotational speed and laminate configuration.

Key Words: finite element • stacking sequence • composite laminates • transverse shear • displacement • failure criterion • failure analysis • first-ply failure load

Journal of Reinforced Plastics and Composites, Vol. 20, No. 14-15, 1326-1357 (2001)
DOI: 10.1106/OBEG-9CXC-0F26-Q368
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G. S. Ramtekkar, Y. M. Desai, and A. H. Shah
First Ply Failure of Laminated Composite Plates - A Mixed Finite Element Approach
Journal of Reinforced Plastics and Composites, February 1, 2004; 23(3): 291 - 315.
[Abstract] [PDF]