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Finite Element Micromechanics for Stiffness and Strength of Wavy Fiber Composites

Mechanical Engineering Department, P.O. Box 3295, University of Wyoming, Laramie, WY 82071-3295, USAgarnich{at}uwyo.edu

Ghodrat Karami

Mechanical Engineering Department, P.O. Box 3295, University of Wyoming, Laramie, WY 82071-3295, USA

In this paper, a micromechanical model of a composite lamina material with fiber waviness is described. Results are presented and discussed with regard to stiffness and strength predictions for composite lamina. A micromechanical model of a unit cell from periodically distributed unidirectional waved cylindrical fibers embedded within matrix is proposed to withdraw the different material stiffness parameters. Finite element analysis of the periodic unit cell characterizing the structural stiffness of the composite material is carried out to determine the average stress and strain components. The composite stress-strain relations are then employed to determine the stiffness parameters. Numerical results for a typical composite constituted of polymer matrix and carbon fibers in the form of periodically hexagonal packing and initially sinusoidal waviness are presented for different amplitude to wavelength ratios and a range of fiber volume fractions. The results reveal the presence of local periodic-antisymmetric stresses that are usually unaccounted for in conventional structural analysis. The potential influence of these stresses on failure prediction is discussed.

Key Words: fiber waviness • stiffness • micromechanics • composites

Journal of Composite Materials, Vol. 38, No. 4, 273-292 (2004)
DOI: 10.1177/0021998304039270


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