扫描电镜下采用动态拉伸法,原位观察SiCw/MB15复合材料在动态受载条件下裂纹形成、扩展至断裂的全过程,并对断口进行了分析。结果表明,裂纹主要在折断的晶须处萌生,在主裂纹前端应力集中区内长大、连结,在与主应力垂直方向上形成宏观裂纹。
The nucleation, propagation of cracks to fracture of SiCw/MB15composites were observed with tensile loading under SEM. It is discovered that cracks mainly nucleate at clearance between broken whiskers. The whole process of crack formation is that micro-cracks propagated and linked each other in the stress concentration zone of the main crack tip, then combined in the perpendicular direction of main stress to form a macro-crack.
参考文献
[1] | Pekguleryuz M O.Proceedings of 1st Canadian International Composite Conference and Exhibition[C].Monteral,1991:278. |
[2] | Duffy L .[J].Materials World,1996,3:127. |
[3] | 吴昆;严峰.SiCw/MB15复合材料挤压板材的力学性能和断口分析[J].物理测试,1999(02) |
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