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

Bioinspired soft-hard interfaces fabricated by multi-material additive manufacturing: A fracture mechanics investigation using essential work of fracture ALTUNTAŞ, UMUT; Çöker, Demirkan; Yavas, Denizhan (2024-08-01) This study employs the Essential Work of Fracture (EWF) concept to evaluate the interfacial fracture toughness of bioinspired interfaces between soft and hard polymer phases. The experimental framework utilizes a model mat...
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 ...
Experimental investigation of dynamic failure in fabric curved composite laminates under pure shear loading Çevik, Ahmet; Yavass, Denizhan; Çöker, Demirkan (2024-01-01) In this paper, an experimental investigation of the failure mechanism in fabric curved composite laminates having a stacking sequence of [(45/0)7/45/45/0/45] is presented. The curved beam specimens are manufactured from AS...
Numerical simulations of low-velocity impact experiments on cross-ply CFRP beams using a heuristic boundary conditions approach with spring elements BATMAZ, ONUR ALİ; Bozkurt, Mirac Onur; Gürses, Ercan; Çöker, Demirkan (2024-01-01) A high-fidelity finite element model is constructed to simulate the low-velocity line-impact experiments conducted previously by Bozkurt and Coker on [05/903]s CFRP beam specimens. In the finite element simulations, we imp...
Bioinspired Interfaces for Improved Interlaminar Shear Strength in 3D Printed Multi-material Polymer Composites ALTUNTAŞ, UMUT; Çöker, Demirkan; Yavas, Denizhan (2024-01-01) Additively manufactured soft-hard composite materials are significant because they combine the benefits of both soft and hard materials, creating a new class of materials with unique properties. The interfaces between the ...
High-speed observation of dynamic delamination failure in tapered composite laminates under tensile loading Bozkurt, Mirac Onur; ÖZEN, EMİNE BURÇİN; Yavuz, Burak Ogun; Parnas, Kemal Levend; Çöker, Demirkan (2024-01-01) This article presents high-fidelity observations of the time evolution of unstable delamination growth in tapered composite beams under tensile loading via ultra-high-speed camera in conjunction with digital image correlat...
Frictional Sliding Modes using the Maxwell-Slip Model Özcan, Tutku Ilgın; Amireghbali, Aydin; Çöker, Demirkan (2024-01-01) This study investigates the frictional sliding dynamics occurring at the interface between two bodies in contact by using the Maxwell-slip model at the microscopic scale. The elastic body is modeled as a set of independent...
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...
EFFICIENT MODELING OF BLADES VIA BEAM ELEMENT IN THE MULTI-OBJECTIVE OPTIMIZATION OF SMALL WIND TURBINE BLADES Kayran, Altan; Çöker, Demirkan; Muyan, Can; Batmaz, Onur Ali; Pourrajabian, Abolfazl; Wood, David (2023-01-01) A study is conducted to propose an efficient structural analysis method to be included in the multi-objective optimization of small wind turbine (SWT) blades. For this purpose, initially aerodynamic optimization of a SWT b...

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