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    Elastic-plastic stress analysis of a thermoplastic composite disc under parabolic temperature distribution
    (Natl Inst Science Communication, 2007) Sen, Faruk; Pekbey, Yeliz; Sayman, Onur
    In this study, an elastic-plastic thermal stress analysis was carried out on a steel fiber reinforced thermoplastic composite disc under a parabolic temperature distribution. The thermal elastic and elastic-plastic solutions were obtained both analytically and numerically. Therefore, FORTRAN and ANSYS programs were used to calculate of thermal stresses for comparison. Tsai-Hill theory was used as a yield criterion during the solution. Thermal stresses occurred in the disc for the parabolic temperature distribution due to the different thermal expansions in radial and tangential directions. The magnitudes of the radial stress components were obtained to be small in comparison with the tangential stress components. Additionally, the tangential stress component was found to be cornpressive and the highest around the inner surface. According to obtained results these two solutions to be in good agreement. The intensities of the residual stress component of the tangential stress and plastic flow were the highest at the inner surface.
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    Fracture energy determination and critical crack propagation between core and veneer ceramic interface by experiment and finite element method
    (Elsevier Sci Ltd, 2009) Toygar, M. Evren; Toparli, Mustafa; Sen, Faruk; Gungor, Mehmet Ali
    Fracture energy of a material has a great importance in determining the resistance of a material to crack propagation. The starting point in fracture mechanics analysis is to consider a crack of a certain size located in a component or specimen. The pure tensile specimen, e.g., SENT (single edge notch tension), has the lowest constraint, while specimens dominated by bending have the highest constraint. In this paper, fracture energy of core and veneer ceramic interface was investigated by a laboratory testing and finite element models. For this purpose, the core and veneering ceramic (IPS Empress 2) was prepared with initial notch. Its fracture energy was measured experimentally by using the crack mouth-opening displacement (CMOD) method. The fracture toughness of core and veneer ceramic at room temperature was investigated experimentally using SENT specimens. The finite element study was also carried out by using 2-D model to calculate the fracture energy (J) value numerically with ANSYS finite element code. The result calculated using the CMOD method has been compared with the finite element method results. Comparison of the results illustrated a good agreement between experimental and numerical studies. (C) 2008 Elsevier Ltd. All rights reserved.