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    Buckling and compressive failure of stepped-lap joints repaired with composite patches
    (SAGE PUBLICATIONS LTD, 2012) Beylergil, Bertan; Aktas, Alaattin; Cunedioglu, Yusuf
    In this study, the buckling and compressive failure of adhesively-bonded stepped-lap joints (with/without composite patches) composed of pultruded glass fiber-reinforced polymer composite laminates was investigated experimentally and numerically. Two-component epoxy adhesive was used for bonding purposes. Composite patches were woven glass-epoxy layer. They were added onto the conventional stepped-lap joints so that additional load transfer paths were created and localized stress concentrations near joint edge were reduced. The axial compression tests were performed and the results revealed that the buckling and failure load of new stepped lap composite joints with composite patches were significantly higher than the conventional stepped lap joints. The influence of the overlap length was evaluated. For both types of joints, a small increase was observed in failure loads by increase of the overlap length. Numerical results showed a very good agreement with experimental results.
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    Enhancement of Single-Lap Composite Joints Strength at Different Temperatures
    (TAYLOR & FRANCIS LTD, 2012) Beylergil, Bertan; Cunedioglu, Yusuf; Aktas, Alaattin
    In this study a novel reinforcing method was examined for glass-fiber reinforced composites consisted of inter-adherend glass fibers which acted as pins to pierce the composite adherend. Two types of inter-adherends were investigated. One of the types involved fibers which acted as pins (type B), and the other type was made up of pin like fibers with bent edges which stuck to the surface of the adherend (type C). Static tensile tests were performed on both types of single-lap joints (SLJ) and for joints without inter-adherend fibers (type A) at four different temperatures (20, 40, 60 and 80 degrees C) in accordance with ASTM standards. The results showed that the fibers improved the ultimate static strength of the single-lap joints over the entire temperature range. (C) Koninklijke Brill NV, Leiden, 2012
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    Experimental and numerical analysis of single lap composite joints with inter-adherend fibers
    (ELSEVIER SCI LTD, 2011) Beylergil, Bertan; Cunedioglu, Yusuf; Aktas, Alaattin
    In this study, a novel reinforcing method for glass-fiber reinforced composites, which consists of inter-adherend glass fibers (IAF) that get through the composite adherend like a pin, was investigated experimentally and numerically. Two types of joints were investigated. One is the traditional single lap joint without inter-adherend (Type A) and the other is Type B in which the fiber pin was used. Static tensile tests were performed at ambient environment in accordance with ASTM standards. In the numerical analysis, ANSYS 12.0 software package was used. The results show that the fibers improve the ultimate strength and damage tolerance of composite joints. In addition, the numerical results show a good agreement with the experimental ones. (C) 2011 Elsevier Ltd. All rights reserved.
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    Experimental and numerical failure analysis of pinned-joints in composite materials
    (ELSEVIER SCI LTD, 2009) Aktas, Alaattin; Imrek, Hueseyin; Cunedioglu, Yusuf
    In this paper, failure load and failure mode of glass-epoxy composite plates with single and double parallel pinned-joints have analysed experimentally and numerically. Two variables were investigated during analyses; the distance from the free edge of plate to the diameter of the first hole (E/D) ratio (2, 3, 4, 5), and the width of the specimen to the diameter of the holes (W/D) ratios (2, 3, 4, 5). Experiments were carried out according to the ASTM D953-D [ASTM D 953-D, Standard test method for bearing strength of plastics, ASTM designation. p. 342-6.]. The numerical study was performed by means of ANSYS finite element analysis program. Yamada-Sun failure criterion was used for failure analyses. Mechanical properties of the composite material were obtained according to ASTM standards. The results showed that the pin hole farthest from the free edge is subjected to the highest stress. A good agreement was obtained between experimental results and numerical predictions. (C) 2008 Elsevier Ltd. All rights reserved.