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Fatigue behavior of surface cracked filament wound pipes with high tangential strength in corrosive environment |
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| Affiliation: | 1. Department of Wind Energy, Composites and Materials Mechanics, Technical University of Denmark, DTU Risø Campus, 4000, Roskilde, Denmark;2. LM Wind Power Blades, Composite Mechanics, Jupitervej 6, 6000, Kolding, Denmark;3. Manchester X-ray Imaging Facility, School of Materials, University of Manchester, Manchester, M13 9PL, United Kingdom;1. Mechanical Engineering Department, University of Bristol, UK;2. Mechanics of Solids, Surfaces and Systems Faculty of Engineering Technology, University of Twente, Netherlands;3. Rolls-Royce plc., Derby, UK;1. Ilgın Vocational School, Selçuk University, 42615, Konya, Turkey;2. Department of Mechanical Engineering, Karamanoglu Mehmetbey University, 70100, Karaman, Turkey;3. Department of Mechanical Engineering, Ahi Evran University, 40100 Kırşehir, Turkey;4. Meram Vocational School, Necmettin Erbakan University, 42000, Konya, Turkey;1. INEGI, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;3. UNIDEMI, Department of Mechanical and Industrial Engineering, NOVA School of Science and Technology, Universidade NOVA de Lisboa, Caparica 2928-516, Portugal;4. CONSTRUCT, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;5. Department of Civil and Structural Engineering, The University of Sheffield, Mappin Street, Sheffield S1 3JD, United Kingdom |
| Abstract: | The aim of this study is to examine the corrosion fatigue behavior of filament wound composite pipes with a surface crack under alternating internal pressure. The filament wound pipes are composed of multi-layered E-glass/epoxy composites with a ±75°]3 lay-up. The surface notches were formed on the outer surface of the pipe along the pipe axis. Dilute (0.6 M) HCl acid was applied to the surface crack region by a corrosion cell mounted on the outer surface of the pipe. The results of an experimental investigation into the corrosion fatigue tests are conducted to observe the oil leakage failure and the crack propagation of the composite pipe subjected internal pressure loading with an open ended condition in which the pipe can be deformed freely in the axial direction. The internal pressure was generated by conventional hydraulic oil for fatigue loading. The fatigue tests are performed at 0.42 Hz frequency and a stress ratio of R = 0.05 in accordance with ASTM D-2992 standard. The oil leakage from the crack tip was observed after the crack propagation reached to the critical stress intensity level. The fatigue crack propagation behavior with the environment exposure was strongly dependent on the crack parameters such as crack-depth ratio and crack-aspect ratio. The micro structure of the fracture surface with the effect of environment and the fatigue loading were also observed. |
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