A 3D ductile constitutive mixed-mode model of cohesive elements for the finite element analysis of adhesive joints

Loading and fracture response of CFRP-to-steel adhesively bonded joints with thick adherents – Part II: Numerical simulation

“…In this work, a recently developed mixed-mode model that accounts for the coupling and interdependency of pure mode EPZ laws has been utilized for the numerical simulation of the tested SLJ cases. This model has been formulated to describe the mixedmode response of an adhesive layer subjected to Mode I and II loading and fracture [22] and of an adhesive layer subjected to Mode I, II and III loading and fracture [23]. The authors have utilized the particular cohesive models, since these have proven to provide accurate predictions of the global response of adhesive joints with ductile adhesives.…”

“…However, working with CZM techniques towards predicting only the strength of joints, one should focus more on utilizing accurate values of the fracture toughness magnitudes, but still using intrinsic laws for ductile adhesives, i.e. exponentiallinear [22,23], and trapezoidal [16,20,21].…”

“…However, preliminary finite element analysis of the tested SLJ geometries in a 2D and 3D space revealed that there is a significant effect of the out-of-the loading plane shear stresses on the failure of the adhesive layer, particularly for the cases where metal adherents enter plasticity. For this purpose, the results presented in this work are based on modeling the joints in a 3D environment by utilizing the Mode I, II and III mixed-mode EPZ model [23]. Fig.…”

“…A more realistic EPZ law and mixed-mode model have been recently developed by Anyfantis and Tsouvalis [22,23] for the prediction of the mixed-mode response of ductile adhesive layers. The model has been validated with metal-to-metal [22][23][24] and composite-to-metal [25] adhesive joints and it has been concluded that it can adequately model the interaction between the adhesive and the adherents.…”

“…The main objective of this study is to provide justifications of the experimentally measured response, by examining the developed stresses and their variation through the loading history. For this purpose the 3D EPZ mixed-mode model [23] has been utilized for the mathematical description of the adhesive's layer response.…”