Yazar "Filiz, Seckin" seçeneğine göre listele

Listeleniyor 1 - 7 / 7
  • Küçük Resim Yok
    Öğe
    Axial vibration of carbon nanotube heterojunctions using nonlocal elasticity
    (Elsevier Science Bv, 2010) Filiz, Seckin; Aydogdu, Metin
    In the present study, axial vibration of carbon nanotube heterojunctions is studied using nonlocal rod theory. The nonlocal constitutive equations of Eringen are used in the formulations. The carbon nanotubes with different lengths, chirality and diameters are considered in the heterojunctions. Effect of nonlocality, length of the carbon nanotubes and lengths of each segment are investigated in detail for each considered problem. It is obtained that, by joining carbon nanotubes good vibrational properties are obtained by suitable selection of parameters. (C) 2010 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Experimental Analysis of Welded Rods with a Functionally Graded Material Approach
    (Mdpi, 2020) Basmaci, Ayse Nihan; Filiz, Seckin; Sahin, Mumin
    In recent years, with the development of welding methods, using these methods in manufacturing industry and in advanced engineering has become more popular. In this study, mechanical properties of rods obtained by friction welding and electric arc welding are compared. Hence, three specimens with different material properties are manufactured, two of which are welded by friction welding and one of which is welded by electric arc welding. These three specimens are adapted to the ASTM E8-04 standard with the help of a universal lathe. Moreover, the tensile stress values and the elasticity modulus of all these specimens are obtained as a result of tensile tests. Accordingly, the effects of the type of welding and material properties used in manufacturing on the mechanical behavior of the specimens are examined. In addition, specimens taken from the cracked surfaces of the pieces broken from the specimens as a result of the tensile test are examined with SEM (scanning electron microscopy). These examinations reveal the microstructure of the specimens. The elemental distribution data obtained as a result of examinations with SEM and the mechanical property data obtained as a result of tensile tests support each other. Furthermore, effects of a heat affected zone (HAZ) on the mechanical properties of the rod are investigated as a functionally graded material.
  • Küçük Resim Yok
    Öğe
    Modeling carbon nanotube-based mass sensors using axial vibration and nonlocal elasticity
    (Elsevier Science Bv, 2011) Aydogdu, Metin; Filiz, Seckin
    In the present study, axial vibration behavior of single-walled carbon nanotube-based mass sensors is studied using nonlocal elasticity theory. The nonlocal constitutive equations of Eringen are used in the formulations. Carbon nanotubes with different lengths, attached mass and boundary conditions are considered in the formulations. The effects of nonlocality, length of the carbon nanotubes and attached mass are investigated in detail for each considered problem. It is shown that the axial vibration behavior of single-walled carbon nanotubes can be used in mass sensors. The dynamic behavior of single-walled carbon nanotubes can be modeled using the nonlocal elasticity models. The mass sensitivity of nanotube-based mass sensors can reach zeptograms. (C) 2011 Elsevier B.V. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Vibration analyses of FGM plates with in-plane material inhomogeneity by Ritz method
    (Elsevier Sci Ltd, 2012) Uymaz, Bahar; Aydogdu, Metin; Filiz, Seckin
    In this study, functionally graded plates which the properties of material varying through the in-plane direction is considered. The analysis is based on a five-degree-of-freedom shear deformable plate theory with different boundary conditions. The vibration solutions are obtained using the Ritz method and assumed displacement functions are in the form of the Chebyshev polynomials. The material properties are assumed to vary as a power form of the in-plane direction. The convergence and comparison studies demonstrate the accuracy and correctness of the present method. Effects of the different material composition, the Poisson ratio and the plate geometry (side-side, side-thickness) on the free vibration frequencies and mode shapes are investigated. (C) 2011 Elsevier Ltd. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Vibration analysis of symmetric laminated composite plates with attached mass
    (Taylor & Francis Inc, 2016) Aydogdu, Metin; Filiz, Seckin
    In this study, vibration of symmetrically laminated composite plates with attached mass is studied. The Ritz method with algebraic polynomial displacement field is used. The plates with at least two adjacent free edges are considered in the formulations. The effect of various parameters (number of layers, ratio of attached mass to the plate mass, position of attached mass, fiber orientation) upon the frequencies and mode shapes is investigated. It is found that attachment of a mass has important effects on the vibration characteristics of composite laminated plates.
  • Küçük Resim Yok
    Öğe
    Vibration of axially functionally graded nano rods and beams with a variable nonlocal parameter
    (Techno-Press, 2018) Aydogdu, Metin; Arda, Mustafa; Filiz, Seckin
    Vibration of axially functionally graded nano-rods and beams is investigated. It is assumed that the material properties change along the rod and beam length. The Ritz method with algebraic polynomials is used in the formulation of the problems. Stress gradient elasticity theory is utilized in order to include the nonlocal effects. Frequencies are obtained for different boundary conditions, geometrical and material properties. Nonlocal parameter is assumed as changing linearly or quadratically along the length of the nanostructure. Frequencies are compared to constant nonlocal parameter cases and considerable differences are observed between constant and variable nonlocal parameter cases. Mode shapes in various cases are depicted in order to explain the effects of axial grading.
  • Küçük Resim Yok
    Öğe
    Wave propagation analysis of embedded (coupled) functionally graded nanotubes conveying fluid
    (Elsevier Sci Ltd, 2015) Filiz, Seckin; Aydogdu, Metin
    In this study, wave propagation in embedded nanotubes conveying fluid is studied. Tubes are formulated as a functionally graded beam in which material properties are changing in the thickness direction. Dispersion relations are obtained for different material properties, elastic medium stiffness and flow velocities. The effect of flow directions is also investigated. Obtained results can be used in the modeling of nano electromechanical systems. (C) 2015 Elsevier Ltd. All rights reserved.