Akış, Tolga

Profile Picture
Profile URL
https://hdl.handle.net/20.500.14411/6697
Name Variants
Akis T.
Akis,Tolga
Tolga, Akış
Akış,T.
Akis,T.
T., Akış
Akis, Tolga
Akış, Tolga
Tolga Akış
T., Akis
T.,Akış
Akış T.
T.,Akis
Akiş T.
A.,Tolga
A., Tolga
Tolga, Akis
Akis, T
Job Title
Profesör Doktor
Email Address
tolga.akis@atilim.edu.tr
Main Affiliation
Civil Engineering
Status
Website
ORCID ID
0000-0002-6754-4497
Scopus Author ID
55144319800
Turkish CoHE Profile ID
177192
Google Scholar ID
27HKOkIAAAAJ
WoS Researcher ID
P-6181-2014

Sustainable Development Goals

NO POVERTY1
NO POVERTY
0
Research Products
ZERO HUNGER2
ZERO HUNGER
0
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GOOD HEALTH AND WELL-BEING3
GOOD HEALTH AND WELL-BEING
1
Research Products
QUALITY EDUCATION4
QUALITY EDUCATION
0
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GENDER EQUALITY5
GENDER EQUALITY
0
Research Products
CLEAN WATER AND SANITATION6
CLEAN WATER AND SANITATION
0
Research Products
AFFORDABLE AND CLEAN ENERGY7
AFFORDABLE AND CLEAN ENERGY
0
Research Products
DECENT WORK AND ECONOMIC GROWTH8
DECENT WORK AND ECONOMIC GROWTH
0
Research Products
INDUSTRY, INNOVATION AND INFRASTRUCTURE9
INDUSTRY, INNOVATION AND INFRASTRUCTURE
0
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REDUCED INEQUALITIES10
REDUCED INEQUALITIES
0
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SUSTAINABLE CITIES AND COMMUNITIES11
SUSTAINABLE CITIES AND COMMUNITIES
6
Research Products
RESPONSIBLE CONSUMPTION AND PRODUCTION12
RESPONSIBLE CONSUMPTION AND PRODUCTION
2
Research Products
CLIMATE ACTION13
CLIMATE ACTION
0
Research Products
LIFE BELOW WATER14
LIFE BELOW WATER
0
Research Products
LIFE ON LAND15
LIFE ON LAND
0
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PEACE, JUSTICE AND STRONG INSTITUTIONS16
PEACE, JUSTICE AND STRONG INSTITUTIONS
0
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PARTNERSHIPS FOR THE GOALS17
PARTNERSHIPS FOR THE GOALS
0
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Documents

28

Citations

508

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13

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Documents

27

Citations

539

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Scholarly Output

53

Articles

34

Views / Downloads

9/0

Supervised MSc Theses

16

Supervised PhD Theses

0

WoS Citation Count

539

Scopus Citation Count

651

Patents

0

Projects

0

WoS Citations per Publication

10.17

Scopus Citations per Publication

12.28

Open Access Source

10

Supervised Theses

16

JournalCount
Iranian Journal of Science and Technology, Transactions of Mechanical Engineering3
Acta Mechanica2
Journal of the Croatian Association of Civil Engineers2
Journal of the Faculty of Engineering and Architecture of Gazi University2
Mechanics Based Design of Structures and Machines2
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Scholarly Output Search Results

Now showing 1 - 10 of 21
  • Thumbnail Image
    Article
    Isı Etkisi Altındaki Fonksiyonel Derecelendirilmiş Malzemeden Yapılmış Uzun Tüplerde Plastik Akmanın Başlaması
    (2006) Akış, Tolga
    İçerisinde düzgün olmayan ısı üreten, fonksiyonel derecelendirilmiş malzemeden yapılmış uzun bir tüpün elastik davranışı analitik olarak incelenmiştir. Tüpün ısı iletim katsayısının ve elastisite modülünün radyal koordinat boyunca lineer olmayan formda değiştikleri varsayılmıştır. Tresca akma kriteri kullanılarak, fonksiyonel derecelendirme parametrelerinin tüpteki plastik akmanın başlangıcına etkileri incelenmiş, akmanın bu parametrelere bağlı olarak önce iç yüzeyden, önce dış yüzeyden, ya da tüpün iç bölgesinden başlayabileceği gözlenmiştir.
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    Master Thesis
    Dönen İki Katmanlı Kompozit Tüplerin Akması
    (2009) Dalkılıç, Mehmet; Akış, Tolga
    Bu çalışmanın amacı, dönen iki katmanlı kompozit tüplerin elastik analizi için analitik bir yaklaşım sunmaktır. Gerilme ve yer değiştirmelere ait ifadeler elde edilmiş ve kritik akma koşulları von Mises akma kriteri kullanılarak incelenmiştir. Analitik çözümler ayrıca çeşitli malzeme setleri için uygulanmış ve dönme etkisi altındaki gerilme ve yer değiştirme dağılımları bulunmuştur. Akmanın sistemin iç yüzeyinden, iki tüpün etkileşim yüzeyinden veya özel bir durum olarak, iki tüpün iç yüzeylerinden eş zamanlı başlayabileceği bulunmuştur.
  • Thumbnail Image
    Article
    Citation - WoS: 33
    Citation - Scopus: 36
    Exact Solution of Rotating Fgm Shaft Problem in the Elastoplastic State of Stress
    (Springer, 2007) Akis, Tolga; Eraslan, Ahmet N.
    Plane strain analytical solutions to estimate purely elastic, partially plastic and fully plastic deformation behavior of rotating functionally graded (FGM) hollow shafts are presented. The modulus of elasticity of the shaft material is assumed to vary nonlinearly in the radial direction. Tresca's yield criterion and its associated flow rule are used to formulate three different plastic regions for an ideal plastic material. By considerina different material compositions as well as a wide range of bore radii, it is demonstrated in this article that both the elastic and the elastoplastic responses of a rotating FGM hollow shaft are affected significantly by the material nonhomogeneity.
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    Article
    Citation - WoS: 20
    Citation - Scopus: 20
    The Stress Response of Partially Plastic Rotating Fgm Hollow Shafts: Analytical Treatment for Axially Constrained Ends
    (Taylor & Francis inc, 2006) Eraslan, Ahmet N.; Akis, Tolga
    analytical solutions to estimating the elastoplastic response of rotating functionally graded (FGM) hollow shafts with fixed ends are presented. The modulus of elasticity, as well as the uniaxial yield limit of the shaft material, are assumed to vary nonlinearly in the radial direction. The plastic model is based on Tresca's yield criterion, its associated flow rule, and ideal plastic material behaviour. Elastic, partially plastic, fully plastic, and residual stress states are investigated. It is shown that the elastoplastic stress response of a rotating FGM hollow shaft is affected significantly by the nonhomogeneity of the material. Unlike the case of a homogeneous hollow shaft, plastic deformation may commence at the inner surface, at the outer surface, or simultaneously at both surfaces. Accordingly, each case requires different mathematical treatment to arrive at its partially plastic solution. It is also shown that, by taking a numerical limit, the complete FGM solution presented herein converge to the solution of a homogeneous rotating shaft.
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    Article
    Citation - WoS: 22
    Citation - Scopus: 27
    The Stress Response and Onset of Yield of Rotating Fgm Hollow Shafts
    (Springer Wien, 2006) Akis, T.; Eraslan, A. N.
    An analytical model is developed to study the stress response and the yielding of rotating functionally graded hollow shafts in the framework of generalized plane strain. The modulus of elasticity and the uniaxial yield limit of the shaft material are assumed to vary radially in nonlinear forms. It is shown that different modes of plasticization may take place. Analytical expressions for the critical values of the material parameters leading to different modes of plastic deformation and the corresponding elastic limit rotation speeds are derived by the use of Tresca's yield criterion.
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    Article
    Citation - WoS: 23
    Citation - Scopus: 30
    On the Elastic-Plastic Deformation of a Rotating Disk Subjected To a Radial Temperature Gradient
    (Marcel dekker inc, 2003) Eraslan, AN; Akis, T
    Elastic-plastic stress distribution in a nonisothermal rotating annular disk is analyzed by the use of Tresca and von Mises criteria. An energy equation that accounts for the convective heat transfer with a variable heat transfer coefficient is modeled. For a given angular velocity, the steady temperature distribution in the disk is obtained by the analytical solution of the energy equation. Tresca yield criterion and its associated flow rule are used to obtain the analytical stress distributions for a linearly hardening material. A computational model is developed to analyze elastic-plastic deformations of the disk using von Mises yield criterion and its flow rule. This model incorporates Swift's hardening law to simulate linear as well as nonlinear hardening material behavior. It is shown that the stress distribution in the disk is affected significantly by the presence of the temperature gradient.
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    Article
    Citation - Scopus: 13
    Deformation Analysis of Elastic-Plastic Two Layer Tubes Subject To Pressure: an Analytical Approach
    (2004) Eraslan,A.N.; Akiş,T.
    Analytical solutions are obtained for axisymmetric elastic-plastic deformations in tightly fitted concentric tubes with fixed ends subjected to either internal or external pressure. Tresca's yield criterion and its associated flow rule are used to estimate the elastic-plastic response of the assembly. The closed form solutions for all elastic-plastic deformation stages are obtained by assuming linear hardening material behavior. Some numerical examples are handled using the mechanical properties of real engineering materials.
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    Article
    Numerical Solutions of a Simplified Reactive Flow Model
    (2007) Eraslan,A.N.; Akiş,T.
    A simple model problem well describing the interaction of convection, diffusion and fast chemistry in laminar reactive flows is formulated. The model involves a minimum number of parameters which are chosen to be close to those in real problems so that the strong interaction of various important processes taking place in reactive flows can be evaluated. Dimensionless forms of the strongly coupled model equations are solved numerically using the collocation method. Steady-state solutions are obtained as the time-asymptotic solution of unsteady problems by using arbitrary initial profiles for temperature. Parametric analyses are performed to investigate the effect of important model parameters on the calculated temperature and concentration distributions.
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    Article
    Citation - WoS: 1
    Citation - Scopus: 3
    Modeling of Asymmetric Shear Wall-Frame Building Structures
    (Architectural inst Japan, 2009) Akis, Tolga; Tokdemir, Turgut; Yilmaz, Cetin
    Based on the conventional wide column analogy, two different three-dimensional shear wall models for open and closed sections are proposed. These approximate models are verified in comparison to not only the results available in the literature but also the ones obtained by Using models containing shell elements. With the help of these new models five different groups of shear wall-frame structures with different floor plans and different heights are analyzed. The first three natural vibration periods are determined and time history analyses are performed. The results Of these computations are observed to be in good agreement with those obtained by detailed models containing shell elements.
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    Article
    Citation - Scopus: 1
    Yielding of Functionally Graded Long Tubes Under Thermal Loading;
    (2006) Akiş,T.
    The elastic behavior of a functionally graded non-uniform heat generating long tube is investigated analytically. The thermal conductivity and the modulus of elasticity of the tube material are assumed to vary radially in nonlinear forms. Making use of Tresca's yield criterion, the effect of grading parameters on the yielding behavior of the tube is investigated. It is observed that plastic flow may commence at the inner surface, at the outer surface or inside the tube depending on the functionally grading parameters.