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

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 230 deg C-13800 deg C were generated. The failure strength, failure strain. proportional limit and modulus of SiC/SiNC composites are reported. The failure mechamsms under monotonic tensile loading were studied using acoustic emission techinque and detailed optical and scanning electron microscopic examinations. The SiC/SiNC woven composites were analyzed under tensile loading by finite element method using isoparanietric 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.