| Fracture toughness,as an important index for evaluating brittle fracture of ceramicmaterials,plays a key role in ceramic fracture mechanics.This article introduces the developmentand related research results of the single-edge notch beam method to measure the fracture tough-ness of structural ceramics. The focus will be on the SEVNB method based on femtosecond laserprocessing of ultra sharp V-notch. The femtosecond laser is used to cut an ideal notch with a tipradius of less than 0.5 um on a structural ceramic sample.Tests have proved that fracture toughness of structural ceramic materials can be measured accurately and reliably by this modified SEVNB method. In addition，the article describes the effect of the V-notch tip radius，the V-notchtip microstructure，and the thermal stress generated by the femtosecond laser on the fracturetoughness test，which provides a basis for the single-edge V-notch beam method to accurately andreliably test the fracture toughness of structural ceramics. |
