Skip to main content

Research Repository

Advanced Search

Experimental evaluation of residual tensile strength of hybrid composite aerospace materials after low velocity impact (2019)
Journal Article
Damghani, M., Ersoy, N., Piorkowski, M., & Murphy, A. (2019). Experimental evaluation of residual tensile strength of hybrid composite aerospace materials after low velocity impact. Composites Part B: Engineering, 179, https://doi.org/10.1016/j.compositesb.2019.107537

© 2019 Elsevier Ltd Although much work has considered hybridised Carbon and Glass Fibre Reinforced Polymers to positively influence the performance of composite structures when subjected to transverse impact loading, there is limited understanding co... Read More about Experimental evaluation of residual tensile strength of hybrid composite aerospace materials after low velocity impact.

Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling (2019)
Journal Article
Yuksel, O., Baran, I., Ersoy, N., & Akkerman, R. (2019). Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling. Composite Structures, 223, 110954. https://doi.org/10.1016/j.compstruct.2019.110954

© 2019 Elsevier Ltd Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been devel... Read More about Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling.

Damage mode identification in transverse crack tension specimens using acoustic emission and correlation with finite element progressive damage model (2018)
Journal Article
Oz, F. E., Ahmadvashaghbash, S., & Ersoy, N. (2019). Damage mode identification in transverse crack tension specimens using acoustic emission and correlation with finite element progressive damage model. Composites Part B: Engineering, 165, 84-95. https://doi.org/10.1016/j.compositesb.2018.11.104

© 2018 Elsevier Ltd In this study, damage progression in unidirectional composite specimens is investigated. Transverse Crack Tension specimens are used to stimulate damage in a predetermined progressive sequence. Acoustic Emission (AE) registration... Read More about Damage mode identification in transverse crack tension specimens using acoustic emission and correlation with finite element progressive damage model.

Quantifying the delamination of L-shaped composite laminates under low velocity impact using x-ray computed tomography (2018)
Presentation / Conference
Cinar, K., Guven, I., Fatih E., O., & Ersoy, N. (2018, September). Quantifying the delamination of L-shaped composite laminates under low velocity impact using x-ray computed tomography. Paper presented at 33rd Technical Conference of the American Society for Composites 2018

Low velocity impact response and failure behavior of L-shaped composite laminates were investigated. The composite laminates with variable thickness, stacking sequences, and corner radius were manufactured using autoclave manufacturing method. Tests... Read More about Quantifying the delamination of L-shaped composite laminates under low velocity impact using x-ray computed tomography.

Multi-instrument multi-scale experimental damage mechanics for fibre reinforced composites (2018)
Journal Article
Lomov, S. V., Breite, C., Carrella-Payan, D., Carvelli, V., Ersoy, N., Gigliotti, M., …Gorbatikh, L. (2018). Multi-instrument multi-scale experimental damage mechanics for fibre reinforced composites. IOP Conference Series: Materials Science and Engineering, 406(1), 012057. https://doi.org/10.1088/1757-899X/406/1/012057

© Published under licence by IOP Publishing Ltd. Reliable investigation of damage in fibre reinforced composites requires concurrent in- and ex-situ application of multiple instruments at different scale: digital image correlation, acoustic emission... Read More about Multi-instrument multi-scale experimental damage mechanics for fibre reinforced composites.

Design of a real-sized composite drive shaft and critical points from beginning to end (2018)
Presentation / Conference
Cinar, K., Ersoy, N., & Unal, M. A. (2018, June). Design of a real-sized composite drive shaft and critical points from beginning to end. Paper presented at ECCM18 - 18th European Conference on Composite Materials

In this study, the replacement of a metal drive shaft by a composite counterapart was investigated. The drive shaft considered here is a thin walled tube with an internal diameter of 60 mm and a length of 1200 mm. These dimensions correspond to the d... Read More about Design of a real-sized composite drive shaft and critical points from beginning to end.

Meso-scale process modelling strategies for pultrusion of unidirectional profiles (2018)
Presentation / Conference
Yuksel, O., Baran, I., Rasmussen, F. S., Spangenberg, J., Ersoy, N., Hattel, J., & Akkerman, R. (2018, June). Meso-scale process modelling strategies for pultrusion of unidirectional profiles. Paper presented at ECCM18 - 18th European Conference on Composite Materials

The resin injection pultrusion is an automated composite manufacturing method in which the resin is injected in a chamber. The flow and the thermo chemical mechanical (TCM) models have been studied for the pultrusion process to improve the reliabilit... Read More about Meso-scale process modelling strategies for pultrusion of unidirectional profiles.

Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension (2018)
Journal Article
Oz, F. E., Ersoy, N., Mehdikhani, M., & Lomov, S. V. (2018). Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension. Composite Structures, 196, 163-180. https://doi.org/10.1016/j.compstruct.2018.05.006

© 2018 Digital Image Correlation monitoring of the surface strains, microscopic in-situ observations of the micro-damage on the specimen edge and Acoustic Emission (AE) are utilized simultaneously during tension tests of quasi-isotropic carbon fibre... Read More about Multi-instrument in-situ damage monitoring in quasi-isotropic CFRP laminates under tension.

Analysis of residual transverse stresses in a thick UD glass/polyester pultruded profile using hole drilling with strain gage and digital image correlation (2018)
Journal Article
Yuksel, O., Baran, I., Ersoy, N., & Akkerman, R. (2018). Analysis of residual transverse stresses in a thick UD glass/polyester pultruded profile using hole drilling with strain gage and digital image correlation. AIP Conference Proceedings, 1960, 020040. https://doi.org/10.1063/1.5034841

© 2018 Author(s). Process induced stresses inherently exist in fiber reinforced polymer composites particularly in thick parts due to the presence of non-uniform cure, shrinkage and thermal expansion/contraction during manufacturing. In order to incr... Read More about Analysis of residual transverse stresses in a thick UD glass/polyester pultruded profile using hole drilling with strain gage and digital image correlation.

Core–shell PVA/gelatin nanofibrous scaffolds using co-solvent, aqueous electrospinning: Toward a green approach (2018)
Journal Article
Sengor, M., Ozgun, A., Corapcioglu, G., Ipekoglu, M., Garipcan, B., Ersoy, N., & Altintas, S. (2018). Core–shell PVA/gelatin nanofibrous scaffolds using co-solvent, aqueous electrospinning: Toward a green approach. Journal of Applied Polymer Science, 135(32), 46582. https://doi.org/10.1002/app.46582

© 2018 Wiley Periodicals, Inc. Electrospinning (ES) of gelatin often requires cytotoxic organic solvents or acidic environments, which deteriorate cell recognition sites. In this study, aqueous, non-toxic, co-solvent ES was performed to obtain core–s... Read More about Core–shell PVA/gelatin nanofibrous scaffolds using co-solvent, aqueous electrospinning: Toward a green approach.

A composite sandwich plate with a novel core design (2018)
Journal Article
Uzal, A., Sonmez, F. O., Oz, F. E., Cinar, K., & Ersoy, N. (2018). A composite sandwich plate with a novel core design. Composite Structures, 193, 198-211. https://doi.org/10.1016/j.compstruct.2018.03.047

© 2018 Elsevier Ltd In this study, a new core design is introduced for sandwich composite structures. Its strength and failure behavior are investigated via three-point bending tests. E-glass-fiber-reinforced epoxy resin is selected as the material f... Read More about A composite sandwich plate with a novel core design.

Do high frequency acoustic emission events always represent fibre failure in CFRP laminates? (2017)
Journal Article
Oz, F. E., Ersoy, N., & Lomov, S. V. (2017). Do high frequency acoustic emission events always represent fibre failure in CFRP laminates?. Composites Part A: Applied Science and Manufacturing, 103, 230-235. https://doi.org/10.1016/j.compositesa.2017.10.013

© 2017 Elsevier Ltd When damage in carbon fibre reinforced composites (CFRP) is monitored by acoustic emission (AE), it is a common belief that high frequency AE events originate from fibre failure. This shows that this statement may not correspond... Read More about Do high frequency acoustic emission events always represent fibre failure in CFRP laminates?.

Custom Design Multi-Axial Engine Mount Load-Cell Development for Road Load Identification and Fatigue Life Estimation (2016)
Journal Article
Ozturk, U. E., Ucar, L., Shahidi, K., Ersoy, N., Zobi, O., Bagdat, U., …Elmalı, S. (2016). Custom Design Multi-Axial Engine Mount Load-Cell Development for Road Load Identification and Fatigue Life Estimation. SAE International Journal of Materials and Manufacturing, 9(3), 642-648. https://doi.org/10.4271/2016-01-0413

Copyright © 2016 SAE International. Internal combustion engines are attached on the vehicle body using engine mounts composed of two cast iron brackets and a rubber isolator connecting them. Engine mount road load identification during vehicle durabi... Read More about Custom Design Multi-Axial Engine Mount Load-Cell Development for Road Load Identification and Fatigue Life Estimation.

3D finite element model for predicting manufacturing distortions of composite parts (2016)
Journal Article
Çınar, K., & Ersoy, N. (2016). 3D finite element model for predicting manufacturing distortions of composite parts. Journal of Composite Materials, 50(27), 3791-3807. https://doi.org/10.1177/0021998315625789

A 3D finite element model has been developed for predicting manufacturing distortions of fibre-reinforced thermosetting composite parts. The total curing process is divided into three steps that correspond to the states that resin passes through duri... Read More about 3D finite element model for predicting manufacturing distortions of composite parts.

A Review on the Mechanical Modeling of Composite Manufacturing Processes (2016)
Journal Article
Baran, I., Cinar, K., Ersoy, N., Akkerman, R., & Hattel, J. H. (2017). A Review on the Mechanical Modeling of Composite Manufacturing Processes. Archives of Computational Methods in Engineering, 24(2), 365-395. https://doi.org/10.1007/s11831-016-9167-2

© 2016, The Author(s). The increased usage of fiber reinforced polymer composites in load bearing applications requires a detailed understanding of the process induced residual stresses and their effect on the shape distortions. This is utmost necess... Read More about A Review on the Mechanical Modeling of Composite Manufacturing Processes.

Failure behavior of composite laminates under four-point bending (2016)
Journal Article
Koc, M., Sonmez, F. O., Ersoy, N., & Cinar, K. (2016). Failure behavior of composite laminates under four-point bending. Journal of Composite Materials, 50(26), 3679-3697. https://doi.org/10.1177/0021998315624251

In this study, failure behavior of fiber-reinforced composites under four-point bending is investigated. First, the tests are modeled analytically using the classical lamination theory (CLT). The maximum allowable moment resultants of [ 12]Toffaxis l... Read More about Failure behavior of composite laminates under four-point bending.

Effect of fibre wrinkling to the spring-in behaviour of L-shaped composite materials (2014)
Journal Article
Çinar, K., Çınar, K., & Ersoy, N. (2015). Effect of fibre wrinkling to the spring-in behaviour of L-shaped composite materials. Composites Part A: Applied Science and Manufacturing, 69, 105-114. https://doi.org/10.1016/j.compositesa.2014.10.025

© 2014 Elsevier B.V. All rights reserved. To determine the amount of deformation resulting from fibre wrinkling at corner regions, a set of experiments have been conducted. As known in the conventional lay-up method, the prepregs are laid sequentiall... Read More about Effect of fibre wrinkling to the spring-in behaviour of L-shaped composite materials.

Modelling manufacturing deformations in corner sections made of composite materials (2013)
Journal Article
Çinar, K., Wisnom, M. R., Çınar, K., Öztürk, U. E., Ersoy, N., & Wisnom, M. R. (2014). Modelling manufacturing deformations in corner sections made of composite materials. Journal of Composite Materials, 48(7), 799-813. https://doi.org/10.1177/0021998313477896

A three-step finite element model has been implemented to predict the spring-in of L-shaped parts. The material property development during the cure has been modelled as step changes during transitions between viscous, rubbery and glassy states of th... Read More about Modelling manufacturing deformations in corner sections made of composite materials.


;