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Paper Information

Journal:   IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)   DECEMBER 2011-JANUARY 2012 , Volume 24 , Number 5 (ISSUE NUMBER 115); Page(s) 380 To 389.
 
Paper: 

MECHANICAL BEHAVIOR OF QUASI-SINUSOIDAL CORRUGATED COMPOSITE SHEETS

 
 
Author(s):  GHABEZI POUYAN, GOLZAR MOHAMMAD*
 
* DEPARTMENT OF MECHANICAL ENGINEERING, FACULTY OF ENGINEERING AND TECHNOLOGY, TARBIAT MODARES UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

An aircraft wing needs to display different mechanical behavior in different directions.1- stiffness in the spanwise (transverse to the corrugation) direction which enables the aerodynamic and inertial loads to be carried. 2- compliance in the chordwise (corrugation) direction which would allow shape changes and increases in surface area; whereas a corrugated sheet due to their special geometry has potential to use in morphing applications. Therefore, in this paper the mechanical behaviour of quasi-sinusoidal corrugated composites is studied by commercial FEM software ABAQUS and a simple analytical model which is used for the initial stiffness of the quasi-sinusoidal corrugated composites (Yokozeki model). The elongation and effective stiffness in longitudinal and transverse directions of quasi-sinusoidal corrugated skins and flat composites are calculated and compared together. Using first and second Castigliano's theorem and Bernoulli-Euler beam theorem can be used to calculate the deflection and rotational angle of a beam (sheet). In this research, different dimensions of quasi-sinusoidal element for unidirectional and woven composites of E-glass/epoxy are investigated. FEM results and analytical model are compared together. Then, the analytical model is validated by experimental results of plain woven E-glass/epoxy composites. The results of FEM, experimental and analytical simulations show that how a corrugated composite can afford with certainty larger deformation than the flat composite in using this analytical model to predict the mechanical behavior of quasi-sinusoidal corrugated composites. It was found that the corrugated composites display extremely high anisotropic behavior and have high tensile and flexural stiffness in transverse direction while exhibiting low stiffness in longitudinal direction of corrugation.

 
Keyword(s): FEM, MORPHING TECHNOLOGY, FLEXURAL AND TENSILE STIFFNESS, COMPOSITE, QUASI-SINUSOIDAL CORRUGATED SHEETS
 
References: 
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