On the effect of substrates type in fracture strength of adhesively bonded DCB joints by a cohesive zone model analysis

A debonding comparative study between Adhesively Bonded Composite Joints and single material joints and software convergence using pre-determined crack growth fracture mechanics based Continuous/Discrete Cohesive Zone Model (CZM) is performed using ANSYS commercial software. A nonlinear spring element is first introduced and then by means of mode I cohesive law (Mode I is an opening mode where the loadings are normal to the crack)cohesive strength σC, fracture energy GIC and cohesive stiffness KIP are calculated for the mentioned nonlinear spring element. This spring serves as the adhesion of the joints. Composite Joints are the joints that are made between two different materials, (here Aluminum-Steel, Aluminum-Composite and Steel-Composite) whereas single material joint are simply joints made between similar materials. Similar adhesive fracture energy is considered for different joints to examine resistance of joints against opening normal to the crack, flexural rigidity of substrates shows direct influence of on the required force to open substrates

Keywords:

Adhesive Bonding , Composite Joint , CZM , DCB , fracture energy