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Behavior of Orthotropic Composite Plate Due to Random Poisson's Ratio  

Noh, Hyuk-Chun (세종대학교 토목환경공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.22, no.6, 2009 , pp. 627-637 More about this Journal
Abstract
Composite materials have been employed in the various engineering applications due to high mechanical performances including high strength-weight ratio and high degree of free formability. Due to complex manufacturing process, however, it can have intrinsic randomness in the material constants which affect the deterministic behavior of the composite structures. In this study, we suggest a formulation for stochastic finite element analysis considering the spatial randomness of Poisson's ratio. Considering the reciprocal relation between elastic moduli and Poisson's ratios in the two mutually orthogonal axes, one of two values of Poisson's ratio can be expressed in terms of the other. Using this, the relation between stress resultants and strains is derived in the ascending order of power of the stochastic field function, which can be directly used in the formulation to obtain the coefficient of variation of responses. The adequacy of the proposed scheme is demonstrated by comparison with the results of Monte Carlo analysis.
Keywords
composite material; laminated composite; randomness; coefficient of variation; stochastic field function;
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