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Closed-form nonlinear sectional analysis of pretwisted anisotropic beam with multiple delaminations

Prasad, PS and Harursampath, Dineshkumar (2012) Closed-form nonlinear sectional analysis of pretwisted anisotropic beam with multiple delaminations. In: 1st International Conference on Mechanics of Nano, Micro, Macro Composite Structures (ICMNMMCS), Special Session: Analytical and numerical techniques for the analysis of composite structures, June 18-20, 2012, Torino, Italy.

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Fiber reinforced laminated composite open-section beams are widely used as bearingless rotor flex beams because of their high specific strength and stiffness as well as fatigue life. These laminated composite structures exhibit a number of different failure modes, including fiber-matrix debonding within individual layers, delamination or separation of the layers, transverse cracks through one or more layers and fiber fracture. Delamination is a predominant failure mode in continuous fiber reinforced laminated composites and often initiate near the free edges of the structure. The appearance of delaminations in the composite rotorcraft flexbeams can lead to deterioration of the mechanical properties and, in turn, the helicopter performance as well as safety. Understanding and predicting the influence of free-edge delamination on the overall behavior of the laminates will provide quantitative measures of the extent of the damage and help ensure their damage tolerance.

Item Type: Conference Paper
Keywords: Composites; Pretwist; Delamination; Variational Asymptotic Method (VAM)
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 12 Mar 2014 05:30
Last Modified: 12 Mar 2014 05:33
URI: http://eprints.iisc.ac.in/id/eprint/48595

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