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Öğe Dugdale-model for a ring-shaped crack in a transtropic thick walled cylinder(WILEY-V C H VERLAG GMBH, 2004) Uyaner, MIn this study, a problem of a ring-shaped crack contained in an infinitely long thick-walled cylinder is considered. The problem is formulated for a transtropic (transversely isotropic) material by using integral transform technique under uniform load. The governing elasticity equation for the transtropic axisymmetric problem in cylindrical co-ordinates was obtained in terms of a Love type stress function. Hankel and Fourier transforms were applied on the stress function because of the geometry of the configuration and boundary conditions. The stress function was expressed in terms of the governing equation. Using the boundary conditions, the problem reduced to a singular integral equation. This singular integral equation is solved by using the Gaussian Quadrature. Then the stress intensity factor at the crack tip was determined. The plastic zone widths are obtained by using the Dugdale model. The plastic zone widths are plotted for various ring-shaped crack sizes and transtropic materials. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.Öğe Elastic-plastic stress analysis of woven Cr-Ni-reinforced composite-laminated plates with a hole under in-plane loading(SAGE PUBLICATIONS LTD, 2005) Yapici, A; Sahin, OS; Uyaner, MAn elastic-plastic stress analysis and the expansion of plastic zone in layers of woven steel fiber-reinforced thermoplastic matrix-laminated plates are studied by using the Finite Element Method and the First-order shear deformation theory for small deformations. Composite structures consisting of woven Cr-Ni wire as a fiber and F2.12 low-density polyethylene as a thermoplastic matrix were manufactured by hot-press molding. The mechanical properties were experimentally determined. The effect of orientation angle and symmetric-antisymmetric structures were investigated. It is assumed that the laminated plates are subjected to in-plane uniform loads. Loading is gradually increased from yield point of the plate as 0.01 MPa at each load step. Load steps are chosen as 300, 400, and 500.Öğe Elasto-plastic stress analysis of aluminum metal-matrix composite plate under in-plane loading(SAGE PUBLICATIONS LTD, 2004) Ataberk, N; Uyaner, M; Avci, A; Kocak, SComposite structure consisting of stainless steel fiber and aluminum matrix is manufactured by hot-press molding. The mechanical properties were determined experimentally. The effect of orientation angle is investigated under in-plane loading. An elastic-plastic numerical solution has been carried out by finite element method (FEM). The expansion of plastic zones has been illustrated in figures.Öğe Strip yield zones around ring-shaped crack in transversely isotropic thick layer(ELSEVIER SCIENCE BV, 2004) Avci, A; Ataberk, N; Uyaner, MA ring-shaped crack under uniform load in an infinitely long elastic-perfectly plastic thick layer is considered. The problem is formulated for a transversely isotropic material by using integral transform technique. Due to the geometry of the configuration, Hankel integral transform technique was chosen and the problem was reduced to a singular integral equation which is solved numerically by using Gaussian Quadrature Formulae and the values were evaluated at discrete points. The plastic zone widths were obtained by using the plastic strip model after stress intensity factors were obtained. Numerical results are plotted for various ring-shaped crack sizes and transversely isotropic materials. It was found that the width of the plastic zone at the inner edge of the crack was greater than the outer one. (C) 2004 Elsevier Ltd. All rights reserved.Öğe Thermal buckling of hybrid laminated composite plates with a hole(ELSEVIER SCI LTD, 2005) Avci, A; Sahin, OS; Uyaner, MThermal buckling analysis of symmetric and antisymmetric cross-ply laminated hybrid composite plates with a hole subjected to a uniform temperature rise for different boundary conditions are presented in this paper. The first-order shear deformation theory in conjunction with variational energy method is employed in the mathematical formulation. The eight-node Lagrangian finite element technique is used for finding the thermal buckling temperatures of hybrid laminates. The effects of hole size, lay-up sequences and boundary conditions on the thermal buckling temperatures are investigated. The results are shown in graphical form for various conditions. (c) 2004 Published by Elsevier Ltd.
