Fracture Toughness Measurement of Adhesively Bonded Joints at Cryogenic Temperatures

摘要

A sharp initial crack tip is required for measuring the fracture toughness or energy release rate of adhesive joints, especially at cryogenic temperatures because a blunt initial crack tip in the adhesive may lead to a higher value of fracture toughness than a sharp initial crack tip. Although ASTM D3433 standard specifies how to measure the fracture toughness of adhesive layers in bonded joints, it does not state the way to generate crack tips.