摘要
提出手工预缝纫方法将3K丝束的T300碳纤维引入预成型体,经过多次反复化学气相渗透工艺,在预成型体和缝线处同时渗透SiC基体,制备Z-pins增强平纹编织C/SiC陶瓷基复合材料.通过双悬臂梁对称弯曲试验测定了层间Ⅰ型应变能释放率,分析了材料的裂纹扩展行为和Z-pins增强机理,建立了层间Ⅰ型裂纹扩展预测模型.结果表明:Z-pins植入平纹编织C/SiC陶瓷基复合材料层压板能提高层间I型断裂韧性.Z-pins增强平纹编织C/SiC陶瓷基复合材料层压板Ⅰ型层间增强机理主要是Z-pins桥连和Z-pins拔出.层间裂纹扩展预测模型的预测结果与试验结果吻合较好.
A manual pre-stitching method was developed to introduce 3K T300 carbon fiber bundle into a preform.Z-pins reinforced woven C/SiC ceramic matrix composite （CMC） was manufactured by using chemical vapor infiltration （CVI） to infiltrate SiC matrix into woven preform and carbon fiber sutures simutaneously and repeatedly.Then,the mode Ⅰ strain energy release rates of the delamination of Z-pins reinforced woven C/SiC ceramic matrix composites were tested by double cantilever beam （DCB） specimen.The delamination behaviors and reinforced mechanisms of the newly manufactured CMC were analyzed and a new prediction model of delamination growth was developed.Results showed that （1） interlaminar fracture toughness of mode Ⅰ is improved by Z-pins insertion into woven C/SiC ceramic matrix composites; （2）Z-pins bridging interlaminar crack and Z-pins pull-out are the major reinforcement mechanisms of Z-pins reinforced woven C/SiC ceramic matrix composites; （3） the predicted results by the delamination growth model are in good agreement with the experiments.
出处
《固体力学学报》
CAS
CSCD
北大核心
2013年第5期466-472,共7页
Chinese Journal of Solid Mechanics
基金
高等学校博士学科点专项科研基金项目(20030699040)
陕西省教育厅专项科研基金项目(2010JK628)资助
关键词
陶瓷基复合材料
断裂韧性
应变能释放率
增强机理
Z-PINS
ceramic matrix composites
fracture toughness
strain energy release rate
reinforced mechanisms
Z-pins
