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Effects of hygrothermal conditions on cross-ply laminated plates resting on elastic foundations

100%

Zenkour A. M. , Allam M. N. M. , Radwan A. F.

Archives of Civil and Mechanical Engineering

2014

tom Vol. 14, no. 1

144--159

The influence of temperature and moisture on the hygrothermal behavior of laminated composite plates resting on elastic foundations is investigated using a refined plate theory. The material properties of the composite are affected by the variation of temperature and moisture. The present plate theory enables the trial and testing of different through-the-thickness transverse shear-deformation distributions and, among them, strain distributions that do not involve the undesirable implications of the transverse shear correction factors. The governing equations are derived based on the present theory, including hygrothermal effects and elastic foundation parameters. The effects of Winkler and Pasternak foundation parameters, temperature, moisture concentration, transverse shear deformation, plate aspect ratio, side-to-thickness ratio on deflections and stresses are investigated.

Elastic and Viscoelastic Stresses of Nonlinear Rotating Functionally Graded Solid and Annular Disks with Gradually Varying Thickness

100%

Allam M. N. M. , Tantawy R. , Yousof A. , Zenkour A. M.

tom Vol. LXIV, nr 4

423--440

Analytical and numerical nonlinear solutions for rotating variable-thickness functionally graded solid and annular disks with viscoelastic orthotropic material properties are presented by using the method of successive approximations.Variable material properties such as Young’s moduli, density and thickness of the disk, are first introduced to obtain the governing equation. As a second step, the method of successive approximations is proposed to get the nonlinear solution of the problem. In the third step, the method of effective moduli is deduced to reduce the problem to the corresponding one of a homogeneous but anisotropic material. The results of viscoelastic stresses and radial displacement are obtained for annular and solid disks of different profiles and graphically illustrated. The calculated results are compared and the effects due to many parameters are discussed.

Elastic and viscoelastic stresses of nonlinear rotating functionally graded solid and annular disks with gradually varying thickness

89%

Allam M. N. M. , Tantawy R. , Yousof A. , Zenkour A. M. , Allam M. N. M. , Tantawy R. , Yousof A. , Zenkour A. M.

nr 4