SiCw/MB15复合材料断裂行为研究

Study on the Fracture Behavior of SiCw/MB15 Composites

扫描电镜下采用动态拉伸法 ,原位观察 Si Cw/ 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 。

WT5BZ]The nucleation, propagation of cracks to fracture of SiCw/MB15 composites 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