Dynamic Observation of Fracture Process in a Silicon Carbide-Matrix Laminated Ceramic Composite
The dynamic process of crack initiation and propagation in a SiC/BN-Al2O3 laminated composite was observed in situ by scanning electron microscopy.During a bending test with a single-edge notched-beam specimen,an interfacial crack first initiated in the interlayer near the notch tip,after which a through-thickness crack formed in the matrix layer at the notch tip.After the through-thickness crack had grown across the first matrix layer,it was deflected by the next interlayer and again became an interfacial crack.Interfacial cracks and through-thickness cracks were generated alternately until the composite failed.The load-displacement plot of the laminated composite exhibited several peaks,each caused by one propagation of a through-thickness crack.The toughening mechanisms of the laminated composite included crack deflection,interfacial cracking,and through-thickness branch cracking.
Laminated composite Silicon carbide Fracture In situ observation
Yang Zhou Guangjiang Yuan Jianfeng Tong Linhu Du Daming Chen Hongxiang Zhai
Institute of Materials,School of Mechanical & Electronic Control Engineering,Beijing Jiaotong Univer Beijing Institute of Aeronautical Materials,Beijing 100095,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
1847-1850
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）