A generalized- Park-Paulinho-Roesler cohesive zone model to simulate moderate ductile adhesive joints

Among all the mechanical joints available in the industry, adhesively bonded joints are highly regarded due to their unique advantages. Therefore, it is of great importance to present an accurate numerical simulation of adhesive joints to predict their mechanical. In this regard, the Cohesive Zone Model (CZM) is the most suitable material model for simulating the adhesive layer in adhesively bonded joints. However, the existing CZM has some limitations to predict the behavior of ductile adhesives, especially under mixed-mode loading. In this paper, a new potential-based CZM based on the Park-Paulinho-Roesler (PPR) model named G-PPR (Generalized - PPR) has been developed to eliminate these limitations. Here, various forms of Traction-Separation Law (TSL) for Araldite® 2015 as a moderate ductile adhesive are directly extracted using Double Cantilever Beam (DCB) and End Notched Flexure (ENF) tests at different adhesive thicknesses. To validate the new model, the numerically derived force-displacement responses of the ENF and Single Lap Joint (SLJ) simulation by G-PPR model were compared with the PPR and Bi-linear numerical responses and experimental results. The G-PPR responses show a more accurate prediction compared to other models for force-displacement curves and different shapes of TSL, especially in a thicker layer of moderate ductile adhesive.