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Öğe Buckling of metal-reinforced thermoplastic composite laminated plates with holes(SAGE PUBLICATIONS LTD, 2005) Yapici, A; Sahin, OS; Arikan, HIn this study, mechanical buckling behaviors of composite square plates of four symmetric and antisymmetric layers with holes are examined. A thermoplastic material is used as the matrix material. Two different reinforced materials are used, of which one is a galvanized steel wire and the other a woven galvanized wire. The hole type is taken as circular. The finite element method is used for the solution. First critical buckling loads of an orthotropic plate with and without hole subjected to unidirectional compression are found. The results are illustrated in figures.Öğe Elastic-plastic stress analysis of thermoplastic matrix-woven fiber composite laminated plates under in-plane loading(SAGE PUBLICATIONS LTD, 2004) Yapici, AThe mechanical performance of composite laminated plate with different loading conditions was investigated. Composite structures consisting of woven galvanized wire as a fiber and F2.12 low density polyethylene (LDPE) as a thermoplastic matrix were manufactured by hot-press moulding. The mechanical properties were experimentally determined. The effect of orientation angle and symmetric-anti symmetric structure was investigated. An elastic-plastic numerical solution was carried out using Finite Element Technique (FEM) for some iteration numbers. Residual stresses and expansion of plastic zone have been illustrated in tables and figures.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 Fatigue failure behavior of glass/epoxy +/- 55 filament wound pipes under internal pressure(ELSEVIER SCI LTD, 2005) Tarakcioglu, N; Gemi, L; Yapici, AIn this study, fatigue behavior of filament wound composite pipes under alternating internal pressure has been investigated. GRP pipes which made of E-glass/epoxy are tested under open ended conditions. Test specimens have four layers which have +/-55degrees winding angle. Tests have been done in accordance with ASTM D-2992. This standards offers 0.42 Hz frequency and R = 0.05 stress ratio. Tests have been performed at different load levels from 30% to 70% of ultimate strength. Whitening, leakage and final failure levels of GRP pipes have been observed. Fatigue results are presented and interpreted by means of S-N curves. (C) 2004 Elsevier Ltd. All rights reserved.Öğe Thermal Buckling Behavior of Hybrid-Composite Angle-Ply Laminated Plates with an İnclined Crack(Consultants Bureau/Sprınger, 2005) Yapici, AA thermal buckling analysis of symmetric and antisymmetric angle-ply laminated hybrid composite plates with all inclined crack subjected to a uniform temperature rise is presented in this paper. The first-order shear deformation theory in conjuction with the variational energy method is employed in mathematical formulations. The eight-node Lagrange finite-element technique is used for determining the thermal buckling temperatures of hybrid laminates. The effect of crack size and stacking sequences oil the temperatures is investigated.
