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Tensile Behavior of Woven Ceramic Matrix Composites at Room and Elevated Temperature: An Experimental and Numerical Study

机译:机织陶瓷基复合材料在室温和高温下的拉伸行为:实验和数值研究

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摘要

The tensile behavior of quasi-isotropic woven silicon carbide fabric reinforced silicon-carbon-nitrogen (SiC/SiNC) matrix composites has been investigated at both room and elevated temperature. The load-displacement and subsequent stress-strain curves at a temperature range of 23℃-1380℃ were generated. The failure strength, failure strain, proportional limit and modulus of SiC/SiNC composites are reported. The failure mechanisms under monotonic tensile loading were studied using acoustic emission technique and detailed optical and scanning electron microscopic examinations. The SiC/SiNC woven composites were analyzed under tensile loading by finite element method using isoparametric layered shell elements. The thermal stresses at different temperature range are also incorporated with the mechanical stress in order to observe the influence of thermal expansion coefficient at elevated temperature. Both the normal and interlaminar shear stress distribution across the thickness are analyzed at room and elevated temperatures.
机译:研究了准各向同性编织碳化硅织物增强的硅碳氮(SiC / SiNC)基复合材料在室温和高温下的拉伸性能。在23℃-1380℃温度范围内产生了载荷-位移及随后的应力-应变曲线。报道了SiC / SiNC复合材料的破坏强度,破坏应变,比例极限和模量。使用声发射技术以及详细的光学和扫描电子显微镜检查研究了单调拉伸载荷下的破坏机理。使用等参层状壳单元,通过有限元方法对拉伸载荷下的SiC / SiNC编织复合材料进行了分析。为了观察高温下热膨胀系数的影响,还将不同温度范围内的热应力与机械应力结合在一起。在室温和高温下,都可以分析整个厚度上的正向和层间剪切应力分布。

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