Influence of temperature on the delamination process under mode I fracture and dynamic loading of two carbon–epoxy composites |
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| Affiliation: | 1. Department of Construction and Manufacturing Engineering, University of Oviedo, Edificio Departamental Oeste n°7, Campus de Viesques, 33203 Gijón, Spain;2. Department of Materials Science and Metallurgical Engineering, University of Oviedo, Edificio Departamental Este, Campus de Viesques, 33203 Gijón, Spain;1. Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial (INEGI), Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. Institute of Innovative Research (IIR), Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-Ku Ward, Yokohama, Kanagawa Prefecture 226-8503, Japan;3. Departamento de Engenharia Mecânica, Instituto Superior de Engenharia do Porto (ISEP), Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida, 431, 4200-072 Porto, Portugal;4. Departamento de Engenharia Mecânica, Faculdade de Engenharia (FEUP), Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;1. AMADE, Polytechnic School, University of Girona, Campus Montilivi s/n, 17003 Girona, Spain;2. Structural Engineering Dept., Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Sharkia, Egypt;3. Dept. of Materials and Production, Aalborg University, Fibigerstraede 16, DK-9220 Aalborg East, Denmark;1. AMADE, Polytechnic School, University of Girona, Campus Montilivi s/n, 17003 Girona, Spain;2. Structural Engineering Dept., Faculty of Engineering, Zagazig University, P.O. Box 44519, Zagazig, Sharkia, Egypt;3. Dept. of Materials and Production, Aalborg University, Fibigerstraede 16, DK-9220 Aalborg East, Denmark |
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| Abstract: | This paper experimentally analyzes the influence of temperature and type of matrix on the delamination process of two composites subjected to fatigue loading through the study of their fracture under mode I behavior. The materials were manufactured with the same AS4 unidirectional carbon reinforcement and two epoxy matrices with different fracture behavior. The chosen temperatures for the experiments were 20 (room temperature), 50 and 90 °C.The experimental study carried out under dynamic loading enabled the authors to determine the influence that temperature has on the onset of delamination for the entire range of fatigue life of the material, from the low number of cycles zone to the high number of cycles zone. That is, it enabled the plotting of fatigue curves, represented as GImax–N (number of cycles required for the onset of delamination given a certain energy release rate) for an asymmetry coefficient of 0.2 (the ratio between the maximum and minimum fracture energies applied during the dynamic tests).The experimental data obtained were treated with a probabilistic model based on a Weibull distribution which allowed the identification of relevant aspects of the fatigue behavior of the materials such as the estimation of fatigue strength for periods greater than the tested values and the analysis of the reliability of the results. |
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| Keywords: | B Delamination B Fracture C Statistical properties/methods |
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