Interfacial fatigue in a fiber reinforced metal matrix composite |
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| Affiliation: | 1. Institute for Infrastructure Engineering, Western Sydney University, Penrith, NSW 2751, Australia;2. Centre for Infrastructure Engineering and Safety, School of Civil and Environmental Engineering, University of New South Wales, NSW 2052, Australia;3. Department of Civil Engineering, Tsinghua University, Beijing 100084, PR China;1. Department of Civil Engineering, Tsinghua University, Beijing 100084, PR China;2. Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia;1. School of Urban Construction, Yangtze University, Jingzhou 434023, China;2. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China;3. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;4. College of Civil Engineering, Huaqiao University, Xiamen 361021, China |
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| Abstract: | An experimental investigation of interface fatigue in a fiber reinforced metal matrix composite has been conducted. For this purpose, the cyclic traction law (the relationship between the fiber stress and the pullout displacement) was measured using fiber pullout tests. On the first loading cycle, the traction law was found to be parabolic, in accord with predictions of a micromechanical model based on a constant interface sliding stress. Upon subsequent unloading and re-loading, the relationship changed, following trends which suggest that the sliding resistance degrades with cyclic sliding. Such effects have been confirmed through SEM examinations of the fiber coatings following fatigue testing. Furthermore, the degradation was found to be greatest near the plane of the matrix crack. The results are consistent with the notion that the degradation in sliding stress occurs most rapidly in regions where the relative sliding distance (fiber/matrix) is greatest. A phenomenological model incorporating such degradation is presented and compared with the experimental measurements. |
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