Production of nanofibers by electrospinning for interfacial toughening of composites

Özçınar, Zeynep Cansu
In this work, electrospinning technique was selected for the production of nanofiber mats to be used in improving the fracture toughness of carbon fiber reinforced composites. The main purpose of this study is to improve GIC delamination mode of polyamide-6 (PA6) nanofibers interleaved carbon fiber reinforced polymer (CFRP) composite. Many studies [1]-[4] have shown that when PA6 nanofiber is used as an interleaving material for improving delamination modes of composites GIIC sliding mode could be significantly increased. However, GIC opening mode could not be improved or even worsened. In an attempt to solve this problem, nanofibers were produced with different combinations and mass ratios of Polyamide 6 (PA6), poly (trimethylene carbonate) (PTMC), poly (Ɛ-caprolactone) (PCL) and shellac polymers. These nanofibers were used as an interleaving material for carbon fiber reinforced polymer (CFRP) composites. GIC fracture toughness of produced composite laminates were tested by means of Double Cantilever Beam (DCB) test. After this test, fracture surfaces of composites were analyzed with the help of Scanning Electron Microscopy (SEM). Among the all results obtained during this study, 13% enhancement in GIC initiation stage compared to neat composite laminate were obtained with combination of PA6 nanofiber and shellac beads interleaving mat.


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Akgül, Alican; Palmeiro-Sanchez, Tania; Lange, Heiko; Magalhaes, Duarte; Moore, Sean; Paiva, Alexandre; Kazanç Özerinç, Feyza; Trubetskaya, Anna (2022-10-05)
© 2022 The AuthorsThe aim of this study was to investigate the pyrolysis products of polyhydroxyalkanoates (PHAs), polyethylene terephthalate (PET), carbon fiber reinforced composite (CFRC), and block co-polymers (PS-b-P2VP and PS-b-P4VP). The studied PHA samples were produced at temperatures of 15 and 50 oC (PHA15 and PHA50), and commercially obtained from GlasPort Bio (PHAc). Initially, PHA samples were analyzed by nuclear magnetic resonance (NMR) spectroscopy and size exclusion chromatography (SEC) to de...
Sonat, Emine Evren; Özerinç, Sezer; Department of Mechanical Engineering (2021-12-10)
Carbon fiber reinforced polymer (CFRP) composites are increasingly used in the aerospace industry due to their high specific strength compared to conventional metallic materials. However, a significant shortcoming of these composites is their increased susceptibility to damage. Structural repair is a common method to restore the load-carrying capacity of a damaged part when the damage size exceeds the pre-defined tolerances. Scarf and stepped bonded repair methods are the primary choice for cases that requi...
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Peker, Zühal; Akkök, Metin; Kılıç, S. Engin; Department of Mechanical Engineering (2015)
In order to fulfill growing demand for lighter aircraft, Carbon fiber reinforced polymers (CFRP) have been developed, which differ from metals with regards to their machinability characteristics. The main problem in machining process is the damage caused by delamination of CFRP materials which need to be both cut and shorn of fibers at the same time, since they are remarkably abrasive in nature. This research aims at accessing the most appropriate cutting condition with less tool wear in routing and trimmin...
Production of in situ aluminum-titanium diboride master alloy formed by slag-metal reaction
CHANGIZI, Ahmad; Kalkanlı, Ali; SEVINC, NACİ (Elsevier BV, 2011-01-12)
Al-TiB(2) master alloys have received much attention in recent years owing to their potential as efficient grain refiners for aluminum foundry alloys. In this study, the process of production of master alloys was investigated to develop a low cost method, namely, slag-metal reaction. This method can be used to fabricate Al-TiB2 master alloy in situ from the TiO(2)-H(3)BO(3)-Na(3)AlF(6) and Al system. Since the price of the raw materials is low and the technology is simple, the processing technique appears t...
Behavior of CFRP confined concrete specimens under temperature cycles and sustained loads
Erdil, Barış; Akyüz, Uğurhan; Yaman, İsmail Özgür; Department of Civil Engineering (2012)
The application of carbon fiber reinforced polymers (CFRP) is one of the effective retrofitting and strengthening methods that is used worldwide and is starting to be used in Turkey as well because they have high strength and high modulus in the fiber direction, have very low coefficient of thermal expansion when compared to concrete and steel and are known not to corrode. Since FRPs are lightweight, their mass can be neglected when compared to concrete and steel. However, before proposing this material as ...
Citation Formats
Z. C. Özçınar, “Production of nanofibers by electrospinning for interfacial toughening of composites,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Chemical Engineering., Middle East Technical University, 2019.