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    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, S
    Composite 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.
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    Elasto-plastic thermal stress analysis in symmetric thermoplastic laminates
    (SAGE PUBLICATIONS LTD, 2005) Callioglu, H; Sayman, O; Ataberk, N
    In this study, a thermal elastic-plastic stress analysis is carried out in steel fiber-reinforced symmetric thermoplastic laminated plates. The material is assumed to be strain-hardening. The orientation angles are chosen as, (0 degrees/90 degrees)(s), (30 degrees/ -30 degrees)(s), (45 degrees/-45 degrees)(s), (60 degrees/-60 degrees)(s), (15 degrees/0 degrees)(s), (30 degrees/0 degrees)(s), (45 degrees/0 degrees)(s), (60 degrees/0 degrees)(s), (75 degrees/0 degrees)(s). The Tsai-Hill theory is used as a yield criterion in the solution. Temperature distribution is chosen as +T-0 and -T-0 at the upper and lower surfaces, respectively. It is found that plastic yielding occurs at the same temperature; all the orientation angles and the plastic region expands the same at the same temperature.
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    Strip yield zones around ring-shaped crack in transversely isotropic thick layer
    (ELSEVIER SCIENCE BV, 2004) Avci, A; Ataberk, N; Uyaner, M
    A 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.