Demirkan Çöker

E-mail

coker@metu.edu.tr

Department

Department of Aerospace Engineering

ORCID

0000-0001-7385-7089

Scopus Author ID

35569393500

Web of Science Researcher ID

B-3386-2011

High-fidelity simulations of low-velocity impact induced matrix cracking and dynamic delamination progression in CFRP beams Batmaz, Onur Ali; Bozkurt, Mirac Onur; Gürses, Ercan; Çöker, Demirkan (2024-02-01) A high-fidelity finite element model is constructed to simulate the low-velocity line-impact experiments conducted by Bozkurt and Coker on [05/903]s CFRP beams. The simulations utilize a user-implemented three-dimensional ...
In-situ observation and numerical study of dynamic delamination in tapered composite laminates Dashatan, Saeid Hosseinpour; Parnas, Kemal Levend; Çöker, Demirkan; Bozkurt, Mirac Onur; Ozen, Emine Burcin (2023-05-15) In this study, dynamic delamination behavior in asymmetric GFRP tapered laminates under quasi-static tensile loading is investigated experimentally and numerically. Abaqus/Explicit cohesive interface modeling is utilized t...
Creating tougher interfaces via suture morphology in 3D-printed multi-material polymer composites by fused filament fabrication Altuntas, Umut; Çöker, Demirkan; Yavas, Denizhan (2023-01-05) This study presents a facile strategy for architecting the interface morphology to create tougher and stronger interfaces in additively manufactured multi-material polymer composites. A sutural interfacial morphology betwe...
Crack propagation in the Double Cantilever Beam using Peridynamic theory Yolum, Ugur; Bozkurt, Mirac Onur; Gok, Eda; Çöker, Demirkan; Gueler, Mehmet Ali (2022-12-01) In this study, Peridynamic (PD) theory is used to model mode-I delamination in unidirectional and multi-directional laminated composites. Experiments are conducted to determine mode-I fracture toughness in a unidirectional...
Fatigue and static damage in curved woven fabric carbon fiber reinforced polymer laminates Tasdemir, Burcu; Çöker, Demirkan (2022-06-01) Failure mechanisms of curved cross-ply laminates under static and fatigue loading have been studied extensively, but the examination of fabric laminates which are the most commonly used ply type in curved supports in airpl...
Understanding mechanical failure of graphite rocket nozzle throats under thermal stresses Nigar, Barış; Dönmez, Serhan; Çöker, Demirkan; Özerinç, Sezer (2021-12-01) © 2021 Elsevier Masson SASMechanical failure of graphite nozzle throats is a common problem of rocket engines. The extreme operating conditions constitute the main cause of the problem, resulting in thermal shock-induced c...
2D and 3D simulations of dynamic delamination in curved unidirectional CFRP laminates subjected to moment/axial combined loading Ata, Tamer Tahir; Çöker, Demirkan (2021-07-15) Dynamic failure of 30-ply curved unidirectional CFRP laminate under quasi-static moment/axial combined loading used in the experiments of Tasdemir (2018) is investigated numerically. 2D and 3D explicit finite element analy...
In-situ investigation of dynamic failure in [0(5)/90(3)](5) CFRP beams under quasi-static and low-velocity impact loadings Bozkurt, Mirac Onur; Çöker, Demirkan (2021-03-01) In this paper, experimental work to investigate the failure sequence in cross-ply CFRP beams under quasi-static and low-velocity impact (LVI) loadings is presented. [0(5)/90(3)](s) CFRP beams with thick clustered plies are...
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...
Improvement of structural characteristics of composite thin-walled beams using variable stiffness concept via curvilinear fiber placement Farsadi, Touraj; Bozkurt, Mirac Onur; Çöker, Demirkan; Kayran, Altan (2021-01-01) This study presents the use of variable stiffness concept via curvilinear fiber placement to achieve improved structural characteristics in composite thin-walled beams (TWBs). The TWB used in the study is constructed in ci...

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