The present paper deals with the first ply failure analysis of laminated composite plates under linearly varying temperature through the thickness of the laminate. The plate element has been modeled as an eight noded isoparametric quadratic plate bending element based on Reissner-Mindlin's assumption for the transverse shear deformation. The deflection and stress resultants obtained in the present study are compared with those available in published literature. The stress level causing the failure of the weakest layer has been detected, based on various stress interactive failure criteria viz. Tsai-Wu and Hoffman's criteria. The temperature of the outermost layer has been computed at the stress level of that weakest ply failure. A parametric study has been carried out on the basis of different lamination schemes and boundary conditions. KEY WORDS: thermal stress, first ply failure, finite element method, laminated composite plate.
To analyze skewed data, skew normal distribution is proposed by Azzalini (1985). For practical problems of estimating the skewness parameter of this distribution, Gupta and Gupta ( 2008) suggested power normal distribution as an alternative. We search for another alternative, named tilted normal distribution following the approach of Marshall and Olkin (1997) to add a positive parameter to a general survival function and taking survival function is of normal form. We have found out different properties of this distribution. Maximum likelihood estimate of parameters of this distribution have been found out. Comparison of tilted normal distribution with skew normal and power normal distribution have been made.
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