Abstract
This paper presents an intriguing fatigue hysteresis behavior of 2.5 dimensional woven C/SiC composites via the integration tool of advanced experimental techniques with a multiscale theoretical model. Tension-tension fatigue experiment has been carried out to predict the fatigue hysteresis properties of 2.5D woven C/SiC composite at room temperature, accompanied with the fracture of specimens to investigate the mechanism of fatigue damage. Meanwhile, a multiscale fatigue model of 2.5D woven C/SiC composites, which encompasses a micro-scale model of fiber/matrix/porosity in fiber tows and a macro-scale model of unit-cell, has been proposed to provide a reliable validation of the experimental results based on fiber damages resulting from relative slip motion with respect to matrix at interfaces and the architecture of 2.5D woven C/SiC composites. The predicted hysteresis loop from theoretical model at room temperature holds great agreement with that from tension-tension fatigue experiments. Also, effects of fatigue load, braided structural parameters and material properties at micro scale on fatigue hysteresis behavior have been investigated.
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Supports of this project provided by National Basic Research Program of China, National Natural Science Foundation of China (51675266), Aeronautical Science Foundation of China (2014ZB52024), the Fundamental Research Funds for the Central Universities (NJ20160038, NS2017011), the 2016 graduate innovation base (Laboratory) open fund (kfjj20160203) are gratefully acknowledged.
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Hu, X., Sun, Z., Yang, F. et al. Fatigue Hysteresis Behavior of 2.5D Woven C/SiC Composites: Theory and Experiments. Appl Compos Mater 24, 1387–1403 (2017). https://doi.org/10.1007/s10443-017-9591-y
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DOI: https://doi.org/10.1007/s10443-017-9591-y