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Öğe Analysis of critical buckling load of laminated composites plate with different boundary conditions using FEM and analytical methods(Elsevier, 2009) Ozben, TamerIn this study, the critical buckling load of fiber reinforced composite plate was calculated by analytical and finite element methods. The critical buckling loads and composite deformations were obtained on the basis of plate dimensions ratio (LxLy). The deformation behaviour of the plate is shown for modes i = 1,2 and different values of orientation angles [0/0](2). As a result of the analysis, for the composite plates with symmetric and antisymmetric layup the critical buckling loads were obtained for different support conditions. It was observed that difference between results increased depending on 0 angle, although critical buckling load values obtained by using numerical and finite element methods were nearly same in [0/0](2) orientation angles. (C) 2009 Elsevier B.V. All rights reserved.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, NurettinThe 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.Öğe FEM analysis of laminated composite plate with rectangular hole and various elastic modulus under transverse loads(Elsevier Science Inc, 2010) Ozben, Tamer; Arslan, NurettinThe 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.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, NurettinIn 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.Öğe Impact behavior of hybrid composite plates dependent on curing and different stacking sequences(Carl Hanser Verlag, 2016) Ozben, TamerIn this study, the drop weight impact response of cured hybrid composite plates has been investigated. Experiments were conducted on two groups of hybrid composite plates. The first group was based on upper and lower surfaces that are made of carbon (c) with the inner plates of glass (g), while for the second group the upper and lower surfaces were examined which are made of glass (g) with the inner plates of carbon (c). The orientation angle of the plates was 0, 15, 30 and 45 degrees and the collision energy was 12 J. Contact forces were obtained and compared for the plates with respect to the different sequence and orientation angles. Peak forces increased for all the sequences and orientation angles. However, the (g-c-c-g) stacking sequence showed a larger sensitivity to an orientation angle change. The deflections decreased for the (c-g-g-c) stacking sequence when the orientation angle increased.Öğe Impact Characteristics of Steel Spheres Dropped into a Single Layer Composite(Carl Hanser Verlag, 2014) Ozben, TamerThe aim of this study was to investigate the different mechanical properties with respect to the impact behaviour on a single layer composite. For this, steel spheres have been used with low initial speed of v(0) = 2.5 m/s, 4 m/s and 5 m/s and three different diameters. The spheres have been dropped to the plate surface in the vertical direction. Sphere diameters of d = 7 mm, 8 5 mm and 10 mm have been chosen and the effect of impact on three different ply made composite materials has been calculated. The impact characteristics were evaluated by the pulse parameter lambda, the reversal energy E, the contact force F, and the rebound velocity V.Öğe Investigation of mechanical and machinability properties of SiC particle reinforced Al-MMC(Elsevier Science Sa, 2008) Ozben, Tamer; Kilickap, Erol; Cakir, OrhanThe paper presents the results of experimental investigation on mechanical and machinability properties of silicon carbide particle (SiC-p) reinforced aluminium metal matrix composite. The influence of reinforced ratios of 5, 10 and 15 wt.% of SiC-p on mechanical properties was examined. The effect of machining parameters, e.g. cutting speed, feed rate and depth of cut on tool wear and surface roughness was studied. It was observed that increase of reinforcement element addition produced better mechanical properties such as impact toughness and hardness, but tensile strength showed different trend; increased upto 10 wt.% of SiC-p reinforced and then decreased when 15 wt.% of SiC-p reinforcement addition. Machinability properties of the selected material were studied and higher SiC-p reinforcement produced a higher tool wear; surface roughness was generally affected by feed rate and cutting speed. (C) 2007 Elsevier B.V. All rights reserved.Öğe INVESTIGATION OF REINFORCEMENT RATE AFFECTING MECHANICAL PROPERTIES AND MACHINABILITY IN Al-SiCp MMCs(Pamukkale Univ, 2006) Kilickap, Erol; Ozben, Tamer; Cakir, OrhanIn this study, the effects of various rate of reinforcement materials (SiCp) addition to Al Si7 Mg2 metal matrix composite on mechanical properties and machinability were investigated. It was noticed that the mechanical properties increased with increasing added reinforcement materials rate in 5, 10 and 15 % SiCp reinforced metal matrix composite. The investigation of tool wear and surface roughness was carried out by using different cutting speeds (50, 100 and 150 m/min) and feed rate (0.1, 0.2 and 0.3 mm/rev) at constant depth of cut (1.5 mm) and reinforcement rates. It was observed that, tool wear and surface roughness increased when reinforcement material rate raised at using the same cutting speed and feed values. The tool life was a maximum when 15 % SiCp reinforced metal matrix composite was machined at 150 m/min of cutting speed. The highest surface roughness was also noticed at 15 % SiCp reinforced metal matrix composite machined at 50 m/min of cutting speed and 0.3 mm/rev of feed.
