Fatigue Crack Growth Behavior of Adhesively-Bonded Unidirectional and Woven CFRP/Aluminum Joints with Acylic Adhesive

Abstract

Structural acrylic adhesives have been attracted special interest because theses adhesives can be cured at room temperature and can be bonded to oily substrates. To use adhesively bonded joints more widely for structural use, it is necessary to clarify fatigue crack propagation characteristics. In this study, fatigue crack growth rate was measured using adhesively bonded unidirectional and woven CFRP/aluminum double cantilever beam (DCB) joints with an acrylic adhesive. To elucidate the difference of fatigue crack growth rates between adhesive joints with unidirectional and woven CFRP adherends, finite element analysis was conducted for these joints, wherein Gurson's model was applied to the adhesive layer. The differences of fatigue crack growth rate can be elucidated from the distributions of void fraction in front of the crack tip for the both joints.