Tolga Akış

Scholarly Output Search Results

Now showing 1 - 4 of 4

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.
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.
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.
Citation - WoS: 50
Citation - Scopus: 55
Plane Strain Analytical Solutions for a Functionally Graded Elastic-Plastic Pressurized Tube
(Elsevier Sci Ltd, 2006) Eraslan, Ahmet N.; Akis, Tolga
Plane strain analytical solutions to functionally graded elastic and elastic-plastic pressurized tube problems are obtained in the framework of small deformation theory. The modulus of elasticity and the uniaxial yield limit of the tube material are assumed to vary radially according to two parametric parabolic forms. The analytical plastic model is based on Tresca's yield criterion, its associated flow rule and ideally plastic material behaviour. Elastic, partially plastic and fully plastic stress states are investigated. It is shown that the elastoplastic response of the functionally graded pressurized tube is affected significantly by the material nonhomogeneity. Different modes of plasticization may take place unlike the homogeneous case. It is also shown mathematically that the nonhomogeneous elastoplastic solution presented here reduces to that of a homogeneous one by appropriate choice of the material parameters. (c) 2006 Elsevier Ltd. All rights reserved.

Journal	Count
Iranian Journal of Science and Technology, Transactions of Mechanical Engineering	3
Acta Mechanica	2
Journal of the Croatian Association of Civil Engineers	2
Journal of the Faculty of Engineering and Architecture of Gazi University	2
Mechanics Based Design of Structures and Machines	2

Akış, Tolga

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Sustainable Development Goals

NO POVERTY

ZERO HUNGER

GOOD HEALTH AND WELL-BEING

QUALITY EDUCATION

GENDER EQUALITY

CLEAN WATER AND SANITATION

AFFORDABLE AND CLEAN ENERGY

DECENT WORK AND ECONOMIC GROWTH

INDUSTRY, INNOVATION AND INFRASTRUCTURE

REDUCED INEQUALITIES

SUSTAINABLE CITIES AND COMMUNITIES

RESPONSIBLE CONSUMPTION AND PRODUCTION

CLIMATE ACTION

LIFE BELOW WATER

LIFE ON LAND

PEACE, JUSTICE AND STRONG INSTITUTIONS

PARTNERSHIPS FOR THE GOALS

Documents

28

Citations

508

h-index

13

Documents

27

Citations

539

Scholarly Output

53

Articles

34

Views / Downloads

9/0

Supervised MSc Theses

16

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0

WoS Citation Count

539

Scopus Citation Count

651

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0

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0

WoS Citations per Publication

10.17

Scopus Citations per Publication

12.28

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10

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16

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