Abstract
In this thesis, a double-scale model for 3 Dimension-4 directional(3D-4d) braided C/SiC composites(CMCs) has been proposed to investigate mechanical properties of it. The double-scale model involves micro-scale which takes fiber/matrix/porosity in fibers tows into consideration and the unit cell scale which considers the 3D-4d braiding structure. Basing on the Micro-optical photographs of composite, we can build a parameterized finite element model that reflects structure of 3D-4d braided composites. The mechanical properties of fiber tows in transverse direction are studied by combining the crack band theory for matrix cracking and cohesive zone model for interface debonding. Transverse tensile process of 3D-4d CMCs can be simulated by introducing mechanical properties of fiber tows into finite element of 3D-4d braided CMCs. Quasi-static tensile tests of 3D-4d braided CMCs have been performed with PWS-100 test system. The predicted tensile stress-strain curve by the double scale model finds good agreement with the experimental results.
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The work was supported 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); Funding of Jiangsu Innovation Program for Graduate Education(CXLX13_165) and the Fundamental Research Funds for the Central Universities.
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Niu, X., Sun, Z. & Song, Y. Transverse Tensile Properties of 3 Dimension-4 Directional Braided Cf/SiC Composite Based on Double-Scale Model. Appl Compos Mater 25, 1001–1019 (2018). https://doi.org/10.1007/s10443-017-9648-y
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DOI: https://doi.org/10.1007/s10443-017-9648-y