Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 6, Pages 6433-6442Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.01.038
Keywords
Joining; Z-pinned joint; Progressive damage analysis; Micro-CT; Composite
Categories
Funding
- Chinese National Foundation for Natural Sciences [51602257, 51702260]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JM5110]
- Postdoctoral Science Foundation of China [2015M570853]
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Progressive failure model is developed to investigate shear behaviors of 2D C/SiC z-pinned joint prepared by chemical vapor infiltration (CVI). It includes progressive failure model of 2D C/SiC composites and cohesive model of faying plane, in order to describe joint nonlinear shear behaviors and z-pin shear-off failure mode, respectively. All cohesive parameters are directly obtained from mechanical properties of 2D C/SiC composites. Results show that the model can almost reproduce joint shear behaviors and z-pin shear-off failure process. Joint failure results from coupled fiber tensile and fiber-matrix shearing damages at faying plane. The model also successfully demonstrates that joint shear properties can be effectively improved by changing z-pin density and diameter. The relationship between joint properties and mechanical properties of 2D C/SiC composites are subsequently obtained with the model. In this sense, joint shear strength increases with cohesive or in-plane shear strengths of 2D C/SiC composites.
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