Effects of frequency on fatigue behavior of CVIC/SiC at elevated temperature

被引:62
作者
Mall, S
Engesser, JM
机构
[1] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA
[2] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA
关键词
ceramics matrix composites; fatigue; frequency effects; elevated temperature; carbon/silicon carbide;
D O I
10.1016/j.compscitech.2005.06.020
中图分类号
TB33 [复合材料];
学科分类号
摘要
Effects of frequency on fatigue behavior of a chemical vapor infiltrated carbon fiber reinforced silicon carbide composite (C/SiC) were investigated at an elevated temperature of 550 degrees C. Tension-tension fatigue tests were conducted at three frequencies: 0.1, 10 and 375 Hz to establish stress versus cycles to failure (S-N) relationships. There was an increase in cycles to failure at a given stress level as frequency increased from 0.1 to 375 Hz at elevated temperature. This trend was different at room temperature where cycles to failure decreased when frequency changed from 40 to 375 Hz but remained almost same below 40 Hz. There was a reduction in cycles to failure at frequencies less than 40 Hz but cycles to failure remained same at a higher frequency of 375 Hz when test environment changed from room temperature to 550 degrees C. Analysis of damage mechanisms showed that the oxidation of carbon fibers was the major difference between the room and elevated temperatures, which caused a reduction in cycles to failure with lower frequencies at elevated temperature in comparison to that at room temperature. However, oxidation of carbon fibers was almost absent or negligible at higher frequency at elevated temperature, which caused practically no reduction in cycles to failure at elevated temperature in comparison to their counterparts at room temperature. Published by Elsevier Ltd.
引用
收藏
页码:863 / 874
页数:12
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