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Non-linear analysis of pretwisted anisotropic beam with multiple delaminations

Puvvala, PS and Rama Sateesh, KV and Harursampath, D (2017) Non-linear analysis of pretwisted anisotropic beam with multiple delaminations. In: 6th Asian-Australian Rotorcraft Forum and Heli Japan 2017, ARF 2017, 7 - 9 November 2017, Kanazawa, Ishikawa.

Full text not available from this repository.
Official URL: https://doi.org/10.1007/s00707-014-1203-4


Fiber reinforced laminated composites are widely used as primary load-carrying members (typically open-section flexbeams) in helicopter rotor blades because of their high specific strengths and stiffnesses (in desired directions) as well as fatigue life. The appearance of delaminations in such 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 delaminations on the overall behavior of the laminates will provide quantitative measures of the extent of the damage and help ensure their damage tolerance. The present work is aimed at the development of an efficient mathematical model to assess the degradation in the stiffness properties of anisotropic strips (with small pretwist, typical of helicopter flexbeams) in the presence of multiple edge delaminations with the motivation to capture those nonlinear effects that arise by virtue of the highly flexible strip-like beam geometry of rotor blades, amplified by the presence of delamination(s). Variational Asymptotic Method (VAM) is used as a tool for asymptotically-correct dimensional reduction of laminated shell theory to a nonlinear one-dimensional (1-D) theory. A study is performed to investigate the influence of the locations, sizes and combinations of delaminations on the trapeze effect, which is important in rotor blades. The developed model has a potential application in structural health monitoring of rotorcraft flexbeams.

Item Type: Conference Paper
Publication: 6th Asian-Australian Rotorcraft Forum and Heli Japan 2017, ARF 2017
Publisher: American Helicopter Society International
Additional Information: The copyright for this article belongs to American Helicopter Society International.
Keywords: Anisotropy; Deterioration; Laminated composites; Laminating; Rotors; Stiffness; Structural health monitoring; Turbomachine blades, Anisotropic beams; Dimensional reduction; Helicopter rotor blades; High specific strength; Multiple delaminations; Quantitative measures; Stiffness properties; Variational asymptotic methods, Helicopter rotors
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 18 Jul 2022 09:25
Last Modified: 18 Jul 2022 09:25
URI: https://eprints.iisc.ac.in/id/eprint/74646

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