"抗缺口冲击韧性" can be translated into English as "notched impact toughness" or "impact toughness against notches".
"Notched impact toughness" is a more concise and commonly used term in materials science and engineering to describe the ability of a material to resist fracture when subjected to an impact load with a notch present, which serves as a stress concentrator.
"Impact toughness against notches" is a slightly more descriptive phrase that explicitly mentions the presence of notches, but both expressions convey the same meaning.