Demirkan Çöker

Department of Aerospace Engineering
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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...
Strength analysis of a 5-m composite wind turbine blade under static and fatigue loading conditions
Muyan, C.; Çöker, Demirkan (2020-10-23)
© Published under licence by IOP Publishing Ltd.This study focuses on the static and fatigue strength analysis of the existing 5-m RUZGEM composite wind turbine blade with and without defect in the form of debonding. Puck ...
Development of Bolted Flange Design Tool Based on Artificial Neural Network
Yıldırım, Alper; Akay, Ahmet Arda; Gülaşık, Hasan; Çöker, Demirkan; Gürses, Ercan; Kayran, Altan (ASME International, 2019-7-17)
<jats:p>Finite element analysis (FEA) of bolted flange connections is the common methodology for the analysis of bolted flange connections. However, it requires high computational power for model preparation and nonlinear ...
Comparison of damage mechanisms in curved composite laminates under static and fatigue loading
Tasdemir, B.; Çöker, Demirkan (Elsevier BV, 2019-04-01)
In this paper, damage progression in curved CFRP composite laminates are experimentally investigated for static and fatigue loadings. Two different cross-ply laminate thicknesses are examined with grouped plies to elucidat...
Simulation of Drop-Weight Impact Test on Composite Laminates using Finite Element Method
Bozkurt, Mirac Onur; Parnas, Levend; Çöker, Demirkan (Elsevier BV; 2019-01-01)
This study presents the simulation of standard drop-weight impact test on a [0/90/0]s composite laminate. For this purpose, a three-dimensional virtual test setup is developed in ABAQUS/Explicit finite element tool. Hemisp...
Interlaminar tensile strength of different angle-ply CFRP composites
Yavuz, Burak Ogun; Parnas, Levend; Çöker, Demirkan (Elsevier BV; 2019-01-01)
Due to high specific strength and modulus requirements, demand for the use of polymer-based composites in structural applications has been increasing more than ever. On the other hand, their interlaminar properties are kno...
3D Simulation of Dynamic Delamination in Curved Composite Laminates
Ata, Tamer Tahir; Çöker, Demirkan (Elsevier BV; 2019-01-01)
In this study, dynamic fracture of curved carbon fiber reinforced plastic (CFRP) laminates under quasi-static loading is investigated using explicit three dimensional (3D) finite element method in conjunction with Cohesive...
Investigation of fretting fatigue failure mechanism of lug-bush connection members
Özen, Emine Burçin; Korkmaz, Yezdan Medet; Çöker, Demirkan (Elsevier BV; 2019-01-01)
Lug-bush connection members are widely used in aerospace industry, specifically in the connection of rotor to helicopter main body. Under small amplitude cyclic loadings, a fraction of the contact area experiences relative...
Finite Element Modelling of TBC Failure Mechanisms by Using XFEM and CZM
Bostanci, Safa Mesut; Gürses, Ercan; Çöker, Demirkan (Elsevier BV; 2019-01-01)
Thermal Barrier Coatings have been widely used in modern turbine engines to protect the nickel based metal substrate from the high temperature service conditions, 1600-1800 K. In this study, failure mechanisms of typical A...
Fretting fatigue failure of lug-bush connection members under tensile loading
Özen, Emine Burçin; Çöker, Demirkan; Korkmaz, Yezdan Medet (2019-01-01)
© 2019 The Vertical Flight Society. All rights reserved.Lug-bush connection members are used widely in the aerospace industry. Under cyclic loads, these connection members fail due to fretting fatigue. The tensile fatigue ...
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