SiCウィスカー強化ガラス複合材料の破壊挙動と強度のばらつき

抄録

Fracture behavior of SiC whisker-reinforced borosilicate glass composites was investigated and the relation between the failure process and scattering of strength is discussed. Both un-notched and notched specimens were used for the fracture test. Acoustic emission signals were also monitored to clarify the failure process.
The strength and fracture toughness of the composite were larger than that of monolithic borosilicate glass. Fracture of the composite initiated at an early stage of loading. Results of Acoustic Emission revealed that the microscopic scale failure occured cumulatively during the stable failure process and this behavior was completely different from that of the glass matrix.
The scatter of strength in the composite was smaller than that of the monolithic glass matrix. This difference seemed not only to be dependent on size variation of largest defect in the composites but also on difference in the failure process.