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Recent Submissions

A crystal plasticity based finite element framework for RVE calculations of two-phase materials: Void nucleation in dual-phase steels
Yalçınkaya, Tuncay; Çakmak, Serhat Onur; Tekoğlu, Cihan (Elsevier BV, 2021-05-01)
© 2020 Elsevier B.V.A crystal plasticity based finite element (CPFE) framework is developed for performing representative volume element (RVE) calculations on two-phase materials. The present paper investigates the mechani...
Aerodynamic shape optimization of wind turbine blades for minimizing power production losses due to icing
Yirtici, Ozcan; Tuncer, İsmail Hakkı (2021-05-01)
Ice formation on a wind turbine alters the airfoil profiles of the blades and causes degradation in the aerodynamic performance of the wind turbine and the resulting power production losses. Since the blade profile plays a...
Asymmetric vortex shedding in the wake of an abruptly expanding annular jet
Vanierschot, Maarten; Perçin, Mustafa; van Oudheusden, Bas W. (2021-04-01)
© 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Abstract: In this paper, the structure of the turbulent wake behind the inner tube of a suddenly expanding annular jet...
Development of a procedure to model the mechanical behavior of composites with embedded element method by considering the matrix non-linearity
ŞIK, ALP; Gürses, Ercan; SABUNCUOĞLU, BARIŞ (2021-03-01)
Embedded element method is considered to be a reliable and efficient method to analyze the mechanical behavior of composite materials. However, the predicted behavior of individual constituents can be inaccurate in case th...
Flutter study of flapwise bend-twist coupled composite wind turbine blades
Farsadi, Touraj; Kayran, Altan (2021-03-01)
Bending-twisting coupling induced in big composite wind turbine blades is one of the passive control mechanisms which is exploited to mitigate loads incurred due to deformation of the blades. In the present study, flutter ...
Numerical investigation of vortical flows over a close-coupled delta canard-wing configuration
Yutuk, Kaan; Tikenogullari, Alp; Tuncer, İsmail Hakkı (2021-02-01)
In this study, vortex dominated flows over a close-coupled canard-wing-body configuration at high angles of attack are studied by using the open-source flow solver, SU2 in a parallel computing environment. Validation studi...
Modeling and numerical simulations of lignite char gasification with CO2: The effect of gasification parameters on internal transport phenomena
Karaca, Mehmet; Kaya, Deniz; Yozgatlıgil, Ahmet; Gokalp, Iskender (Elsevier BV, 2021-02-01)
The purpose of this study is to develop an experimental data-based char particle gasification model in order to assess the effects of particle size, gasification temperature and char generation heating rate on global gasif...
Intersonic shear crack propagation using peridynamic theory
Yolum, Ugur; Çöker, Demirkan; Guler, Mehmet A. (2021-02-01)
Dynamic crack propagation of mode-II cracks is simulated using bond-based Peridynamic Theory (PD) implemented in finite element analysis software ABAQUS. The specimen is a bonded homogeneous Homalite plate with a pre-notch...
Misorientation and grain boundary orientation dependent grain boundary response in polycrystalline plasticity
Yalçınkaya, Tuncay; ÖZDEMİR, İZZET; Tandoğan, İzzet Tarık (2021-02-01)
This paper studies the evolution of intergranular localization and stress concentration in three dimensional micron sized specimens through the Gurtin grain boundary model (J Mech Phys Solids 56:640-662, 2008) incorporated...
Vibration control of a smart piezo beam via gain scheduling H-infinity controller based on LPV model
TURAN, ABDULLAH; Şahin, Melin; ONAT, CEM (2021-01-01)
In this study, a gain scheduling H-infinity controller based on Linear Parameter Varying (LPV) model was designed and applied to suppress the first out of plane bending vibration of a variable parameter smart beam equipped...
Potential of High Compressive Ductility of Ultrafine Grained Copper Fabricated by Severe Plastic Deformation
Asano, Mayu; Yuasa, Motohiro; Miyamoto, Hiroyuki; Tanaka, Tatsuya; Erdoğan, Can; Yalçınkaya, Tuncay (2020-11-01)
Severe plastic deformation (SPD) can fabricate high-strength materials by forming an ultrafine grained (UFG) microstructure. Low elongation to failure of UFG materials in tensile tests, which has often been regarded as a m...
Quaternion-based nonlinear attitude control of quadrotor formations carrying a slung load
Ariyibi, Segun O.; Tekinalp, Ozan (Elsevier BV, 2020-10-01)
Control of a pair of quadrotors carrying a slung load is addressed. A hierarchical control algorithm is implemented on the leader quadrotor. The control system features a linear quadratic tracking controller on its outer l...
Experiences with two detached eddy simulation approaches through use of a high-order finite volume solver
Cengiz, Kenan; Özyörük, Yusuf (Wiley, 2020-08-01)
In the present study, two advanced detached eddy simulation (DES) approaches, shear-layer-adapted delayed DES and zonal DES in mode II, which are known to help transition from RANS to LES mode, are employed in various flow...
Classical flutter analysis of composite wind turbine blades including compressibility
Farsadi, Touraj; Kayran, Altan (Wiley, 2020-08-01)
For wind turbine blades with the increased slenderness ratio, flutter instability may occur at lower wind and rotational speeds. For long blades, at the flutter condition, relative velocities at blade sections away from th...
Pervane ve pervane kolu Arasındaki etkileşimin askıda uçuş durumu için hesaplamalı yöntemle incelenmesi
Yener, Serkan; Perçin, Mustafa (2020-07-01)
This study exploresthe interaction between a propellerand various framearm geometries,which are typically used in multi-rotor applications. The influence of the arm on the propulsiveperformance of the ...
Filtering-Based Three-Axis Attitude Determination Package for Spinning Spacecraft: Preliminary Results with Arase
Söken, Halil Ersin; Sakai, Shin-ichiro; Asamura, Kazushi; Nakamura, Yosuke; Takashima, Takeshi; Shinohara, Iku (2020-07-01)
JAXA's ERG (Exploration of Energization and Radiation in Geospace) Spacecraft, which is nicknamed Arase, was launched on 20 December 2016. Arase is a spin-stabilized and Sun-oriented spacecraft. Its mission is to explore h...
Değişken Parametreli Bir Akıllı Kiriş için Düşük Dereceli H∞ Kontrolcü Tasarımı
Onat, Cem; Şahin, Melin (2020-06-01)
Bu çalışmada PZT (kurşun-zirkonyum-titanyum) yamalar ile donatılmış değişken parametreli bir akıllı kirişin düzleme dik birinci eğilme titreşim biçimlerini bastırmak için düşük dereceli bir H∞ kontrolcü tasarlanmış ve uygu...
Enhancing thermal conductivity of epoxy with a binary filler system of h-BN platelets and Al2O3 nanoparticles
Yetgin, Hasan; Veziroglu, Salih; Aktas, Oral Cenk; Yalçınkaya, Tuncay (Elsevier BV, 2020-04-01)
Epoxy resin is a common adhesive bonding material used to join dissimilar materials, especially in the electronics and aerospace industries. However, its low thermal conductivity and high coefficient of thermal expansion l...
Identification of Physical Helicopter Models Using Subspace Identification
Avcioglu, Sevil; Kutay, Ali Türker; Leblebicioğlu, Mehmet Kemal (2020-04-01)
Subspace identification is a powerful tool due to its well-understood techniques based on linear algebra (orthogonal projections and intersections of subspaces) and numerical methods like singular value decomposition. Howe...
Attitude estimation and magnetometer calibration using reconfigurable TRIAD plus filtering approach
Söken, Halil Ersin; Sakai, Shin-ichiro (Elsevier BV, 2020-04-01)
This paper proposes using TRIAD and Unscented Kalman Filter (UKF) algorithms in a sequential architecture as a part of a small satellite attitude estimation algorithm. This TRIAD+UKF approach can both provide accurate atti...
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