Flexural Strength Analysis of Continuous Fiber Reinforced Ceramic Matrix Composites
Experimental researches reveal that bulk density determines the porosity in CMCs structure, which may reduce the effective load bearing area and elastic modulus of the composites, and meanwhile induce stress concentrations, However, the carbon interface with appropriate thickness can adjust the stress distribution in fiber and relieve stress concentration, consequently increase the flexural strength. In this paper, the tensile and flexural properties of a 2D-C/SiC composite were studied by experimental method. The load-displacement curve of the composite under bending load is nearly linear before fracture happens, while the uniaxial tensile stress-strain behavior is obviously non-linear. The measured data shows that the three-point-bending strength is higher than the uniaxial tensile strength. Meanwhile, based on the above analysis, a flexural strength model was presented for fiber reinforced CMCs by applying statistic theory, shear lag theory, and the rule of mixture Effects of material density and carbon interphase on the mechanical properties of the composites were considered. The predictions are in good agreement with experimental results.
ceramic matrix composites(CMCs) flexural strength density porosity interface
Yang Chengpeng Jiao Guiqiong Wang Bo
Department of Engineering Mechanics, Northwestern Polytechnical University, Xian 710129, China
国际会议
2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)
西安
英文
877-880
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）