Fracture characterization of a bi‐material bonded aluminum/CFRP joints under mixed‐mode I + II loading

Abstract

Fracture characterization under mixed-mode I + II loading of bi-material bonded joints with aluminum-carbon fiber reinforced polymer (AL-CFRP) adherends was analyzed in this work. Five different and quite simple fracture tests were employed aiming to cover properly the complete mixed-mode I + II range and identifying a representative energy-based fracture criterion. A mode partitioning method lying on cohesive zone analysis was implemented, enabling the identification of strain energy mode I and mode II components for each type of test, which is relevant regarding the estimation of the energybased criterion defining the fracture envelope of these bi-material joints.

A calculation method for the mode II fracture energy release rate of dissimilar materials adhesively bonded structures

“…Considering the numerical calculation of J-integral, Raju and Shivakumar 30 proposed an equivalent domain integration method to calculate the J-integral. As for the 2D crack, Equation ( 25) is equivalent to the surface integral of a finite domain around the crack tip as shown in Equation (26).…”

“…The mode II K-calibration was obtained for a finite crack in the elastic sandwich layer and extended to plasticity crack tip via a mode II strip-yield model of finite strength and toughness. Moreira et al 26 investigated the fracture characterization under mixed-mode I + II loading of bimaterial bonded joints with aluminum-CFRP adherends. The mode II component was determined by a mode partitioning method 27 lying on cohesive zone analysis.…”