CRYOGENIC FRACTURE BEHAVIOR OF STRUCTURAL ADHESIVE FILM WITHIN CFRP-ALUMINUM BOND JOINTS

摘要

The cryogenic fracture performance of structures adhesively bonded between an aluminum metal liner (Al) and CFRP laminate using structural adhesive film AF163-2K is examined in this study. The tensile Mode-I and shear Mode-II fracture strengths of CFRP-AF163-2K bond joints and AI-AF163-2K bond joints are separately evaluated at room temperature (RT) and cryogenic temperature (-163℃) using various standard testing methods for different adherend materials. The experimental results indicate that both cryogenic Mode-I and Mode-II fracture strengths of CFRP-AF163-2K bond joints dropped much more than AI-AF163-2K bond joints. The mismatch of thermal expansion ratios between CFRP laminate and AF163-2K adhesive film, which exceeds that between aluminum and AF163-2K, is considered to be the primary reason for the different cryogenic fracture behavior of the two bond structures.