三维针刺碳纤维增强SiC复合材料在加载-卸载下的拉伸行为  

TENSILE BEHAVIOR OF THREE-DIMENSIONAL NEEDLED CARBON FIBER REINFORCED SiC COMPOSITE UNDER LOAD-UNLOAD

作　　者：聂景江[1] 徐永东[1] 万玉慧[1] 张立同[1] 成来飞[1] 马军强[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,西安710072

出　　处：《硅酸盐学报》2009年第1期76-82,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50672076;90405015)资助项目。

摘　　要：对T300碳纤维增强三维针刺碳纤维增强SiC(C/SiC)复合材料(纤维体积含量为30%)的单调和加载-卸载拉伸载荷下的拉伸行为进行了研究。结果表明:T300碳纤维增强三维针刺C/SiC复合材料的拉伸强度和断裂应变分别为129.6MPa和0.61%。单调和加载-卸载拉伸应力-应变曲线均为非线性变化,主要是复合材料中裂纹的扩展,界面相脱黏和滑移,以及纤维的逐步断裂和拔出所致,使得复合材料在拉伸载荷下呈非脆性破坏。卸载应力水平对卸载后的残余应变和再加载模量有较大影响。卸载应力小于80 MPa时,随着卸载应力的增加,残余应变线性增加,模量线性降低:卸载应力高于80MPa时,二者随着卸载应力的增加而呈二次函数快速变化。The monotonic and load-unload tensile behaviors of three-dimensional(3D)needled T300 C/SiC composite were investi- gated.The results show that the tensile strength and strain of the 3D needled T300 C/SiC composite are 129.6MPa and 0.61%,re- spectively.The stress-strain curves of the 3D needled T300 C/SiC composite under monotonic and step tensile loads exhibit a nonlin- ear behavior,which is caused by the propagation of micro-cracks,debonding and sliding of interfaces,and gradually results in frac- turing a...

关 键 词：三维针刺 碳/碳化硅复合材料 加载卸载 拉伸行为 

分 类 号：TB332[一般工业技术—材料科学与工程]