Fatigue behavior and residual strength evolution of 2.5D C/C-SiC composites

Fatigue behavior and residual strength evolution of 2.5D C/C-SiC composites
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2.5D C/C-SiC 复合材料的疲劳行为和残余强度演变

DOI:
10.1016/j.jeurceramsoc.2016.07.009
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发表时间:
2016-12
影响因子:
5.7
通讯作者:
Krenkel Walter
Krenkel Walter
中科院分区:
材料科学1区
文献类型:
--
作者:
Li Yang;Xiao Peng;Luo Heng;Almeida Renato S. M.;Li Zhuan;Zhou Wei;Brueckner Alex;er;Reichert Florian;Langhof Nico;Krenkel Walter

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研究了2.5维C/C-SiC(2.5DC/C-SiC)复合材料在疲劳载荷作用下的剩余拉伸强度(RTS)变化规律。结果表明,2.5D C/C-SiC复合材料的疲劳极限(106周)达到58.2MPa,相当于原始静拉伸强度(77.7MPa)的75%。此外,疲劳加载后,观察到的极限强度提高。当试样承受69.3MPa的疲劳应力105次循环时,最显著的RTS增加到92.5MPa。微观结构分析表明,循环加载后的RTS是由裂纹的形成和扩展以及界面退化的影响。此外,在这项工作中提出的模型可以很好地评估RTS的复合材料的施加疲劳循环的数量。
The residual tensile strength (RTS) evolution of a chemical vapor infiltration and liquid silicon infiltration based 2.5 dimensional reinforced C/C-SiC (2.5D C/C-SiC) composites after fatigue loadings has been investigated. The results show that the fatigue limit (106cycles) of the 2.5D C/C-SiC composites reaches 58.2 MPa, which corresponds to 75% of the virgin static tensile strength (77.7 MPa). Moreover, an ultimate strength enhancement is observed after fatigue loading. The most pronounced RTS increases to 92.5 MPa when specimens are subjected to fatigue stress of 69.3 MPa for 105cycles. The microstructural analysis indicates that RTS after cyclic loading is affected by the formation and propagation of cracks and interfacial degradation. Furthermore, a model proposed in this work can well evaluate the RTS of the composites in relation to the number of the applied fatigue cycles.
DOI: 10.1520/stp27977s
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