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    Öğe
    Expansion of plastic zone and residual stresses in the thermoplastic-matrix laminated plates ([0°/?°]2) with a rectangular hole subjected to transverse uniformly distributed load expansion
    (Elsevier, 2009) Ozben, Tamer; Arslan, Nurettin
    The present paper focused on the understanding of elastic stress, residual stress and plastic zone growth in layers of stainless steel woven fiber-reinforced thermoplastic matrix composite laminated plates with rectangular hole by using the finite element method (FEM) and first-order shear deformation theory for small deformations. Moreover, the computer program was developed for small elasto-plastic stress analysis of laminated plates. The laminated plate with rectangular hole consists of four reinforced layers bonded symmetrically and antisymmetrically in [0 degrees/theta degrees](2) configuration. Various applied distributed loads with different layer orientation angles and rectangular hole dimensions were used for obtaining corresponding variation of residual stresses and the expansions of the plastic regions. it was observed that the intensity of the stress components and plastic zones were the maximum near corners of the rectangular hole. (c) 2008 Elsevier B.V. All rights reserved.
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    Öğe
    FEM analysis of laminated composite plate with rectangular hole and various elastic modulus under transverse loads
    (Elsevier Science Inc, 2010) Ozben, Tamer; Arslan, Nurettin
    The aim of this work is to predict the expansion of the plastic zone and residual stresses in layers of fiber-reinforced, thermoplastic laminated composite plates with rectangular hole. The effects of the material properties (constant modulus ratio, E-1/E-2) on residual stresses and expansion of the plastic zone are studied. The elastic and elastio-plastic stresses are analyzed using the finite element method (FEM) by means of a developed computer program with FORTRAN 90. Loading is gradually increased from yield point of the plate as 0.0001 Mpa at each load step. The elastic, elastio-plastic, residual stress components, and the expansion of the plastic zones are obtained for different load steps, different orientation angles, and rectangular hole dimensions under clamped and simply supported boundary conditions. Results showed that the maximum stress levels and the plastic zones appear the vicinity of the rectangular hole at the upper and lower layers. The relevant analysis is carried out under clamped and simply supported boundary conditions for different thermoplastic materials having constant modulus, E-1, E-2. (C) 2009 Elsevier Inc. All rights reserved.
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    Öğe
    Fuzzy logic model for the prediction failure analysis of composite plates under various cure temperatures
    (Abcm Brazilian Soc Mechanical Sciences & Engineering, 2014) Ozben, Tamer; Huseyinoglu, Mesut; Arslan, Nurettin
    In this study, stress values were examined in pin/bolt connected composite plates which were applied preload and non-preload moment. Composite plates were produced with different curing cycles and geometric dimensions. Failure analysis of composite plates was carried out by applying different preload moments. The results obtained from experimental study were processed using fuzzy model. The results of experiments and fuzzy model were presented as a comparative. As a result of the comparison, it can be said that the initial stress values of failure were approximately determined using fuzzy model.
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    Öğe
    STRESS INTENSITY ANLAYSIS OF BIAXIAL STRESSED SINGLE ELLIPTICAL HOLE IN PLATE ACCORDING TO CHANGE OF HOLE INCLINATION AND GEOMETRY
    (Gazi Univ, Fac Engineering Architecture, 2011) Ozben, Tamer T.; Arslan, Nurettin; Ozbay, Mahmut
    Discontinuities such as the holes in a finite plate under loading while the more stress concentrations around holes causes. Applied to the edges of plate and the different rates the principal stresses (sigma(1)/sigma(2)) around the hole were caused by the stress components (x, y) changes investigated. For biaxial stress in the plate, according to the different stress rate variation of stress intensity was obtained around the hole According to long edge (2b) and short edge (2a) of ellipse hole length the distribution of stress field occurring in the plate surfaces were are showed. Moreover, according to the plate width (H) the maximum stress value was calculated using the finite element method for different stress rates and large edge length of an ellipse. The inclination (theta=0(0), 15(0), 30(0), 45(0) and 90(0)) of ellipse hole with different geometries, according to the plate axis the maximum stress values and the stress field distribution the finite element and analytic method are obtained, and results were compared.