Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 13, Pages 14505-14510Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.06.061
Keywords
C/C-SiC; Liquid silicon infiltration; Fatigue; Cracking; Residual strength
Categories
Funding
- China Scholarship Council
- Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center in Central South University
- National Science Foundation of China [51575536, 51205417]
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An experimental investigation was performed to study the influence of fatigue damage introduced by different loading cycles on the residual tensile strength (RTS) of plain-weave reinforced C-f/C-SiC composites (2D C/C-SiC). The specimens were subjected to the fatigue stress of 57 MPa for the preselected numbers of cycles as follows: 102, 104 and 105, respectively, before the static tensile test. The microstructures and fractured surfaces after the tensile test were examined by optical and scanning electron microscopy, respectively. The results showed that the RTS of the specimens after the preselected fatigue cycles numbers of 10(2),10(4) and 10(5) increase to 89.8, 94.1 and 82.4 MPa, respectively, which are somewhat higher compared to the virgin samples (79.7 MPa). Additionally, we found that the linear part of the tensile stress-strain curve is independent on the fatigue cycles. Finally, the increased fatigue damage in C/C-SiC composites could determine a reduction of elastic modulus in all cases of fatigue tests. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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