摘要
The mechanical behavior of three-dimensional integral braided carbon-carbon composites (C/C) has been explored under unconventional fatigue loading, and a series of special experimental phenomena were observed. In this present paper, one of these phenomena, the micro silk-like pleating of the pyrocarbon matrix, is discussed. With thermodynamic analysis, it is shown that small areas of high-temperature contribute to the micro-pleating formation. Moreover, slight friction between pyrocarbon laminates has been proven to produce the small high-temperature areas during cyclic tensile loading.
The mechanical behavior of three-dimensional integral braided carbon-carboncomposites (C/C) has been explored under unconventional fatigue loading, and a series of specialexperimental phenomena were observed. In this present paper, one of these phenomena, the microsilk-like pleating of the pyrocarbon matrix, is discussed. With thermodynamic analysis, it is shownthat small areas of high-temperature contribute to the micro-pleating formation. Moreover, slightfriction between pyrocarbon laminates has been proven to produce the small high-temperature areasduring cyclic tensile loading.
基金
supported by the National Natural Science Foundation of China(Grant No.50072019)
National Defense Science&Technology Fund(2000J12.5.3,HK0312).
