摘要
使用夏比摆锤冲击试验机对C/C和C/SiC两种复合材料进行了冲击试验,打击瞬时线速率为2.9 m/s,刀刃半径为2 mm。使用光学显微镜和扫描电子显微镜观察了试样断口形貌。结果表明:C/C和C/SiC两种复合材料的夏比冲击能量随着材料密度的增加而减小,冲击能量与密度基本呈线性关系。密度低的C/C和C/SiC复合材料冲击后的断口参差不齐,有大量纤维束和纤维拔出,夏比冲击韧度较高;高密度试样的宏观断口较为平整,仅有少量的纤维拔出,具有脆性断裂特征。
The charpy impact properties of C/C and C/SiC composites were investigated.The specimens were impacted with the knife radius of 2 mm at a linear velocity of 2.9 m/s.The fracture morphologies were examined by Optical Microscope and Scanning Electron Microscope.The results indicate that a linear relationship is present between the impact energy and the density of both composites.The composites with higher density failed at smaller impact energy and their fractured surface are characteristic of few pull-out fibers.Whereas,the fractured surface is rougher for the sample with a lower density,in dicating a large amount of fibers or fiber bundles were pulled out from the matrix.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第2期95-98,共4页
Journal of Aeronautical Materials
基金
国家自然科学基金(50702045)
高等学校博士学科点专项科研基金(20070699007)
新世纪优秀人才支持计划(NCET-08-0460)
关键词
夏比冲击
冲击能量
密度
charpy impact
impact energy
density
