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Strength probability of unidirectional hybrid composites
Authors:J. Gutans  V. Tamuzs
Affiliation:1. Centre for Research in Nanotechnology and Science, IIT Bombay, India;2. Department of Metallurgical Engineering & Materials Science, IIT Bombay, India;3. Department of Mechanical Engineering, IIT Bombay, India;4. Department of Chemical Engineering, IIT Bombay, India;1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, China;2. State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, Nanchang 330013, China;3. Engineering Research & Development Centre for Underground Technology of Jiangxi Province, Nanchang 330013, China;4. Department of Architecture and Civil Engineering, City University of Hong Kong, Kowloon, Hong Kong, China;5. College of Civil Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu Province, 224051, China;6. Department of Civil and Environment Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. DEMec, FEUP, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;2. INEGI – Instituto de Engenharia Mecânica e Gestão Industrial, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;3. Centre for the Research and Technology of Agro-Environmental and Biological Sciences, CITAB, University of Trás-os-Montes and Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal
Abstract:A probability strength analysis of an unidirectional three-component hybrid composite (HC) is carried out for the cases of high modulus (HM) fibres and low modulus (LM) elastic fibers regularly embedded in a low elastic modulus matrix. Both single layer intraply and multilayer HC are considered. The fiber strength is assumed to be a random variable with a Weibull distribution. Breaking of the HM fibers are accumulated initially while probability of LM fiber failure is low. Failure modes tend to be covered by the two extreme cases of alternative failure of HM and LM fibers only. These modes can be categorized by using graph technique. Developed are the algorithm for finding the most probable pattern of fiber breaking and method for estimating the strength and fiber damage of a HC. The stress level at which the LM fibers are found to break represents a lower bound of the HC strength. Damage of HM fibers in a three-component HC is much higher than in a two-component HM fibre composite. Negative ‘hybrid effect’ for strength is obtained.
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