Explanipedia

High‐speed observation of dynamic delamination failure in tapered composite laminates under tensile loading Open

Mirac Onur Bozkurt, Emine Burcin Ozen, Burak Ogün Yavuz, Levend Parnas, Demirkan Çöker · 2024

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 correlation. Asymmetrical…

Experimental investigation of dynamic failure in fabric curved composite laminates under pure shear loading Open

Ahmet Çevik, Denizhan Yavaş, Demirkan Çöker · 2024

Effects of Ply-Group Thickness on the Damage Mechanisms in Cfrp Cross-Ply Laminates Under Low-Velocity Impact Open

Onur Ali Batmaz, Demirkan Çöker · 2024

Numerical simulations of low-velocity impact experiments on cross-ply CFRP beams using a heuristic boundary conditions approach with spring elements Open

Onur Ali Batmaz, Mirac Onur Bozkurt, Ercan Gürses, Demirkan Çöker · 2024

Frictional Sliding Modes using the Maxwell-Slip Model Open

Tutku Ilgın Ozcan, Aydın Amireghbali, Demirkan Çöker · 2024

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 mass-spring unit…

Effect of Ply Thickness on Dynamic Damage Progression in Cross-ply Laminates Under Low-velocity Impact Open

Onur Ali Batmaz, Demirkan Çöker · 2023

: In this study, we have conducted in-situ LVI experiments on cross-ply CFRP beams having stacking layups [04/904/02]s and [02/902/02/902/02]s. The progression of damage is observed through high-speed photography. In addition to LVI, quasi…

Effect of Ply Thickness on Dynamic Damage Progression in Cross-ply Laminates Under Low-velocity Impact Open

Onur Ali Batmaz, Demirkan Çöker · 2023

: In this study, we have conducted in-situ LVI experiments on cross-ply CFRP beams having stacking layups [04/904/02]s and [02/902/02/902/02]s. The progression of damage is observed through high-speed photography. In addition to LVI, quasi…

Frictional Sliding of Rough Surfaces Using a Quasi-static Approach to the Maxwell-slip Model Open

Aydın Amireghbali, Demirkan Çöker · 2021

The Maxwell-slip model consists of independent mass-spring units that are slipped by a driver over a rigid, flat, fixed substrate. In the present study, the model is interpreted as a multi-asperity model and is used to study both the frict…

Numerical Simulations of Dynamic Delamination In [05/903]S CFRP Beams Subjected To Transverse Impact Open

Demirkan Çöker, M. Bozkurt, Ercan Gürses · 2021

Investigation of Three-Dimensional Dynamic Delamination in Curved Unidirectional CFRP Laminates Open

Tamer Tahir Ata, Demirkan Çöker · 2021

Finite element simulations for investigating the strength characteristics of a 5 m composite wind turbine blade Open

Can Muyan, Demirkan Çöker · 2020

Full-scale structural tests enable us to monitor the mechanical response of the blades under various loading scenarios. Yet, these tests must be accompanied by numerical simulations so that the physical basis of the progressive damage deve…

Strength analysis of a 5-m composite wind turbine blade under static and fatigue loading conditions Open

Can Muyan, Demirkan Çöker · 2020

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 progressive damage analysis is used to investigate the effect of …

Virtual full-scale testing for investigating strength characteristics of a composite wind turbine blade Open

Can Muyan, Demirkan Çöker · 2020

Full-scale structural tests enable us to monitor mechanical response of the blades under various loading scenarios. Yet these tests must be accompanied with numerical simulations, so that the physical basis of the progressive damage develo…

Comparison of damage mechanisms in curved composite laminates under static and fatigue loading Open

Burcu Tasdemir, Demirkan Çöker · 2019

3D Simulation of Dynamic Delamination in Curved Composite Laminates Open

Tamer Tahir Ata, Demirkan Çöker · 2019

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 Zone Modelling (…

Interlaminar tensile strength of different angle-ply CFRP composites Open

Burak Ogün Yavuz, Levend Parnas, Demirkan Çöker · 2019

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 known to be relative…

Finite Element Modelling of TBC Failure Mechanisms by Using XFEM and CZM Open

Safa Mesut Bostancı, Ercan Gürses, Demirkan Çöker · 2019

Investigation of fretting fatigue failure mechanism of lug-bush connection members Open

Emine Ozen, Yezdan Medet Korkmaz, Demirkan Çöker · 2019

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 motion which cau…

Simulation of Drop-Weight Impact Test on Composite Laminates using Finite Element Method Open

Mirac Onur Bozkurt, Levend Parnas, Demirkan Çöker · 2019

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. Hemispherical impactor …

Finite Element Modelling of TBC Failure Mechanisms by Using XFEM Open

Safa Mesut Bostancı, Ercan Gürses, Demirkan Çöker · 2018

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, some of the failure mechanisms of typical Air Pl…

Damage Progression in Thick Curved Composite Laminates under Static and Fatigue Loading Open

Burcu Tasdemir, Demirkan Çöker · 2018

In this study, damage behavior of curved carbon fiber reinforced polymer (CFRP) composite laminates that are important sub-structures (ribs, shear webs and spar flanges etc.) for wind turbine blades are investigated under static and fatigu…

Strength Analysis of a Composite Turbine Blade Using Puck Failure Criteria Open

Meltem Ozyildiz, Can Muyan, Demirkan Çöker · 2018

The strength analysis of an existing 5-meter composite wind turbine blade using Tsai- Wu and Puck failure criteria is presented. Finite element analysis is performed on the blade under static flap wise loading. ANSYS APDL scripting languag…

Peridynamic Modelling of Delamination in DCB Specimen Open

Uğur Yolum, Eda Gök, Demirkan Çöker, Mehmet Ali Güler · 2018

Peridynamics is a robust theory to capture failure initiation and failure propagation in both isotropic and orthotropic materials. This paper present a method to model Mod I delamination failure in composite materials using PD approach imp…

Sliding contact on the interface of elastic body and rigid surface using a single block Burridge-Knopoff model Open

Aydın Amireghbali, Demirkan Çöker · 2018

Burridge and Knopoff proposed a mass-spring model to explore interface dynamics along a fault during an earthquake. The Burridge and Knopoff (BK) model is composed of a series of blocks of equal mass connected to each other by springs of s…

Finite element analysis of fretting contact for nonhomogenous materials Open

Yezdan Medet Korkmaz, Demirkan Çöker · 2018

Fretting problem arises in the case of relatively small sliding motion between contacting surfaces. Fatigue life of the components that are in contact with each other, especially in rotorcraft may be significantly reduced due to fretting. …

Dynamic Frictional Sliding Modes between Two Homogenous Interfaces Open

W Taj, Demirkan Çöker · 2018

Dynamic frictional sliding behaviour between two homogenous Homalite blocks is studied. The blocks are initially held together using a constant compressive stress. The sliding motion is initiated by impacting one of the blocks with an exte…

Comparison of Equivalent Stress Methods with Critical Plane Approaches for Multiaxial High Cycle Fatigue Assessment Open

Zafer Engin, Demirkan Çöker · 2017

Static analysis of a composite wind turbine blade using finite element model Open

Meltem Ozyildiz, Demirkan Çöker · 2017

This study is presented here that the stress characteristics of an existing 5-meter \n \ncomposite wind turbine blade for 30 kW wind turbine designed for METUWIND is known by using finite \nelement method. Modal and static analysis is per…

Finite element analysis of fretting contact for dissimilar and nonhomogeneous materials Open

Yezdan Medet Korkmaz, Demirkan Çöker · 2017

Role of Laminate Thickness on Sequential Dynamic Delamination of Curved [90/0] CFRP Composite Laminates Open

İmren Uyar, Burcu Tasdemir, Denizhan Yavaş, Demirkan Çöker · 2016

In aerospace industry, high demand for the lightweight structures are fostering the use of carbon fiber reinforced polymer composites in a wide variety of shapes, as primary load carrying elements. However, once a composite laminate takes …

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