Argeşo, Ahmet Hakan
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Argeso, H.
A. H. Argeşo
A.H.Argeşo
Argeşo, Ahmet Hakan
Ahmet Hakan, Argeşo
Argeso, Hakan
A., Ahmet Hakan
Argeso,A.H.
A.,Ahmet Hakan
A., Argeso
Argeso, Ahmet Hakan
Argeşo,A.H.
Argeso, H
A.,Argeşo
Ahmet Hakan, Argeso
A. H. Argeso
A.H.Argeso
Argeso, Hakan
Argeşo, A. Hakan
Argeso, H.
A. H. Argeşo
A.H.Argeşo
Argeşo, Ahmet Hakan
Ahmet Hakan, Argeşo
Argeso, Hakan
A., Ahmet Hakan
Argeso,A.H.
A.,Ahmet Hakan
A., Argeso
Argeso, Ahmet Hakan
Argeşo,A.H.
Argeso, H
A.,Argeşo
Ahmet Hakan, Argeso
A. H. Argeso
A.H.Argeso
Argeso, Hakan
Argeşo, A. Hakan
Argeso, H.
Job Title
Profesor Doktor
Email Address
hakan.argeso@atilim.edu.tr
ORCID ID
Scopus Author ID
Turkish CoHE Profile ID
Google Scholar ID
WoS Researcher ID
Scholarly Output
10
Articles
7
Citation Count
83
Supervised Theses
2
9 results
Scholarly Output Search Results
Now showing 1 - 9 of 9
Article Citation Count: 0Elastostatics of star-polygon tile-based architectured planar lattices(Elsevier Sci Ltd, 2023) Soyarslan, Celal; Gleadall, Andrew; Yan, Jiongyi; Argeso, Hakan; Sozumert, Emrah; Manufacturing Engineering; Department of Mechatronics EngineeringA panoptic view of architectured planar lattices based on star-polygon tilings was developed. Four starpolygon-based lattice sub-families, formed of systematically arranged triangles, squares, or hexagons, were investigated numerically and experimentally. Finite-element-based homogenization allowed computation of Poisson's ratio, elastic modulus, shear modulus, and planar bulk modulus. A comprehensive understanding of the range of properties and micromechanical deformation mechanisms was developed. Adjusting the star-polygon angle achieved an over 250-fold range in elastic modulus, over a 10-fold range in density, and a range of -0.919 to +0.988 for Poisson's ratio. Additively manufactured lattices, achieved by novel printing strategies, showed good agreement in properties. Parametric additive manufacturing procedures for all lattices are available on www.fullcontrol.xyz/#/models/1d3528. Three of the four sub-families exhibited in-plane elastic isotropy. One showed high stiffness with auxeticity at low density and a primarily axial deformation mode as opposed to bending deformation for the other three lattices. The range of achievable properties, demonstrated with property maps, proves the extension of the conventional material-property space. Lattice metamaterials with Triangle-Triangle, Kagome, Hexagonal, Square, Truncated Archimedean, Triangular, and Truncated Hexagonal topologies have been studied in the literature individually. Here, it is shown that these structures belong to the presented overarching lattice family. (c) 2023 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Article Citation Count: 29Dynamic analysis of linear viscoelastic cylindrical and conical helicoidal rods using the mixed FEM(Academic Press Ltd- Elsevier Science Ltd, 2014) Eratli, Nihal; Argeso, Hakan; Calim, Faruk F.; Temel, Beytullah; Omurtag, Mehmet H.; Manufacturing EngineeringThe objective of this study is to investigate the influence of the rotary inertia on dynamic behavior of linear viscoelastic cylindrical and conical helixes by means of the Laplace transform-mixed finite element formulation and solution. The element matrix is based on the Timoshenko beam theory. The influence of rotary inertias is considered in the dynamic analysis, which is original in the literature. Rectangular, sine and step type of impulsive loads are applied on helices having rectangular cross-sections with various aspect ratios. The Kelvin and standard models are used for defining the linear viscoelastic material behavior; and by means of the correspondence principle (the elastic-viscoelastic analogy), the material parameters are replaced with their complex counterparts in the Laplace domain. The analysis is carried out in the Laplace domain and the results are transformed back to time space numerically by modified Durbin's algorithm. First, the solution algorithm is verified using the existing open sources in the literature and afterwards some benchmark examples such as conical viscoelastic rods are handled. (C) 2014 Elsevier Ltd. All rights reserved.Article Citation Count: 6Parametric analysis of viscoelastic hyperboloidal helical rod(Sage Publications inc, 2016) Ermis, M.; Eratli, N.; Argeso, H.; Kutlu, A.; Omurtag, M. H.; Manufacturing EngineeringThe objective of this study is to perform a pioneering research about a viscoelastic hyperboloidal helical rod having a standard type of distortional behavior and a Kelvin type of bulk compressibility. Field equations are based on the Timoshenko beam theory, and the exact curvatures of the hyperboloidal geometry are considered through the formulation. The numerical analysis is carried out by the mixed finite element method, considering the rotary inertia, in the Laplace space, and the results are transformed back to time space numerically using the modified Durbin's algorithm. A cantilevered hyperboloidal helical rod having solid circular, hollow circular, and thin-walled hollow circular cross sections is handled, and the rod is loaded by rectangular and triangular impulsive types of point load at the tip. Through the analysis, different values of retardation time, three different relaxation functions associated with shear modulus, and three different creep functions associated with bulk modulus are handled. Finally, a benchmark example is presented, and the influence of the loading and the material parameters on the helix geometry is discussed.Article Citation Count: 13Skeletonization-based beam finite element models for stochastic bicontinuous materials: Application to simulations of nanoporous gold(Cambridge Univ Press, 2018) Soyarslan, Celal; Argeso, Hakan; Borgmann, Swantje; Manufacturing Engineering; Department of Mechatronics EngineeringAn efficient representative volume element generation strategy is developed in modeling nanoporous materials. It uses periodic 3D beam finite element (FE) models derived from skeletonization of spinodal-like stochastic microstructures produced by a leveled random field. To mimic stiffening with agglomeration of the mass at junctions, an increased Young's modulus is assigned to the elements within the junction zone. The effective Young's modulus, Poisson's ratio, and universal anisotropy index are computed. A good agreement of the Young's modulus predictions with those obtained from experimental results for phase volume fractions 0.20 < phi(B) < 0.50 is observed. Moreover, the elastic anisotropy index of the generated beam networks shows sufficient proximity to isotropy. Finally, it is demonstrated that, as compared to the simulation statistics of voxel-FE models, for the beam-FE models over 500-fold computational acceleration with 250-fold less memory requirement is provided.Article Citation Count: 4A frequency domain boundary element formulation for dynamic interaction problems in poroviscoelastic media(Springer, 2014) Argeso, Hakan; Mengi, Yalcin; Manufacturing EngineeringA unified formulation is presented, based on the boundary element method, to perform the interaction analysis for the problems involving poroviscoelastic media. The proposed formulation permits the evaluation of all the elements of impedance and input motion matrices at a single step in terms of system matrices of boundary element method without solving any special problem, such as, unit displacement or load problem, as required by conventional methods. It further eliminates the complicated procedure and the need for using scattering analysis in the evaluation of input motion functions. The formulation is explained by considering a simple interaction problem involving an inclusion embedded in an infinite poroviscoelastic medium, which is under the influence of a dynamic excitation induced by seismic waves. In the formulation, an impedance relation is established for this interaction problem, suitable for performing the interaction analysis by substructure method, which permits carrying out the analysis for inclusion and its surrounding medium separately. The inclusion is first treated as poroviscoelastic, then viscoelastic and finally rigid, where the formulation in each of these cases is obtained consecutively as a special case of the previous one. It is remarkable to note that, a cavity problem where there is a hole in place of inclusion can be also considered within the framework of the present formulation. The formulation is assessed by applying it to some sample problems. The extension of the formulation to other types of interaction problems, such as, multi-inclusion problems, the analyses of foundations supported by a poroviscoelastic medium, etc., will be the subject of a separate study.Article Citation Count: 15Elastic analysis of variable profile and polar orthotropic FGM rotating disks for a variation function with three parameters(Springer Wien, 2017) Essa, Saad; Argeso, Hakan; Manufacturing EngineeringAnalytical solutions are developed for the analysis of elastic polar orthotropic functionally graded annular disks rotating with constant angular velocity. The formulations are carried out by presuming a state of plane stress and small deformations. The elasticity moduli and thickness are varied radially by a nonlinear function controlled by three parameters, while the radial variation of density may be defined by any form of continuous function. Poisson's ratios are taken to be constant. Annular disks having traction-free inner and outer surfaces, and annular disks mounted on a circular rigid shaft having traction-free outer surface are studied separately. The analytical solutions are verified numerically by the use of a computational model based on the nonlinear shooting method. An analysis that inspects the effects of the degree of orthotropy is presented. Elastic limit angular velocities are determined according to Hosford's yield criteria. Stress, displacement and strain profiles are compared within the elastic range.Article Citation Count: 16ANALYTICAL SOLUTIONS TO VARIABLE THICKNESS AND VARIABLE MATERIAL PROPERTY ROTATING DISKS FOR A NEW THREE-PARAMETER VARIATION FUNCTION(Taylor & Francis inc, 2012) Argeso, Hakan; Manufacturing EngineeringAnalytical solutions of two different annular rotating disk problems are obtained under the assumptions of plane stress, isotropy, and small deformations. The first problem involves a homogeneous variable profile disk, whereas the second one is a functionally graded disk having a variation in elasticity modulus. For the variations of disk thickness and elasticity modulus in these problems, a new form of nonlinear function controlled by three parameters is introduced. The derivations of the closed form solutions for both type of rotating disk problems are carried out in a unified form. The closed form solutions are verified numerically by the nonlinear shooting method.Master Thesis Isı üreten çok katmanlı kompozit silindir ve tüplerin termoelastik analizi(2012) Yıldırım, Murat; Argeşo, A. Hakan; Manufacturing EngineeringIsıya bağımlı malzeme özelliklerine sahip içten ısı üreten çok katmanlı kompozit silindir ve tüplerin termoelastik analizi için bir sayısal hesaplama yöntemi geliştirilmiştir. Kompozit sistemin sonsuz uzunlukta ve uçlarının sabitlenmiş olduğu kabul edilmiştir. Formülasyonlarda, küçük şekil değiştirme teorisi kullanılmıştır. Kompozit yapıyı oluşturan katmanlar izotrop ve sabit ısı üretimine sahiptir. Termal ve mekanik problemler girişimsiz ve eksenel simekriktir. Termal problem kararlı ve mekanik problem düzlem gerinme problemidir. Hesaplamalı yöntem atış algoritmasına dayanmaktadır. Hem thermal hem mekanik problemler atış algoritması ile çözülmüştür. Hesaplamalı yöntem ilk olarak analitik çözümü bilinen ve fiziksel özellikleri ısıya bağlı olmayan bazı test problemleri ile doğrulanmıştır. Hesaplamalı yöntem daha sonra, fiziksel özellikleri ısıya bağlı olan kompozit silindir/tüp sistemlerinin çözümünde kullanılmıştır.Doctoral Thesis Kutupsal ortotrop fonksiyonel olarak kademelendirilmiş içi boş dönen disklerin elastik analizi(2015) Essa, Saad; Argeşo, Ahmet Hakan; Manufacturing EngineeringBu çalışmada, kutupsal ortotrop, içi boş ve fonksiyonel olarak kademelendirilmiş dönen diskler için yarı analitik ve analitik çözümler geliştirilmiştir. Çözümler disk kalınlığının değişimini de gözönüne almaktadır. Formülasyonlar kutupsal koordinatlar kullanılarak gerçekleştirilmiş ve malzeme özelliklerinin radyal koordinat doğrultusunda değişim gösterdiği varsayılmıştır. Problemleri tarif eden denklemler düzlem gerilme ve küçük şekil değişmeler varsayımları altında elde edilmiştir. Çalışmada iki farklı sınır koşuluna sahip disk gözönüne alınmıştır. Birincisinde diskin iç ve dış yüzeylerinin serbest, ikincisinde ise, diskin iç tarafında rijit bir cisim bulunduğu ve dış yüzeyinin serbest olduğu durum gözönüne alınmaktadır. Yarı-analitik çözümler elastisite modüllerinin ve disk kalınlığının üç parametre ile kontrol edilen ve doğrusal olmayan bir fonksiyonla değiştiği kabul edilerek bulunmuştur. Poisson oranları sabit kabul edilmiş ve yoğunluğun ise herhangi bir sürekli fonksiyonla tariflenelebileceği varsayılmıştır. Üç parametreli doğrusal olmayan fonksiyon literatürde malzeme kademelendirilmesini tarif etmek için yaygın olarak kullanılan eksponansiyel ve kuvvet formunda ifade edilen fonksiyonların birleşimidir. Analitik çözümler elastisite mödüllerinin, disk kalınlığının ve yoğunluğun kuvvet formunda değiştiği kabul edilerek bulunmuştur. Çözümler doğrusal olmayan atış yöntemine dayalı bir sayısal yöntem kullanılarak doğrulanmıştır. Çalışmada ilk olarak doğrulama örnekleri sunulmuştur. Sonrasında, ortotropi derecesi ve malzeme kademelendirilmesinin disklerin elastik davranışına etkisi parametrik analiz yaparak gösterilmiştir. Analizlerde disklerin elastik limit açısal hızları Horford'un akma kriterine göre elde edilmiştir.
