A novel traction–separation law for the prediction of the mixed mode response of ductile adhesive joints

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

“…Thus, a value of error e less than 1% yields accurate strength predictions and conservative predictions regarding the corresponding displacement. This conclusion is in agreement with the corresponding one reported in reference [20], where the simulation of the adopted adhesive joints is based on a 2-dimensional space and thus only Mode I and II loading and fracture are present. When designing an adhesive joint with respect to its strength, the proposed EPZ model yields very promising results, since an error e value ranging from 0.01 to 1% does not affect the linear and the non-linear load path (see Figure 11) up to the strength limit.…”

“…However, it is impossible to formulate the coupling (interdependency) between a linear and a highly non-linear softening response within a numerical scheme, in order to yield a mixed-mode constitutive model. Additionally, several studies [20,22,31,32,33,34,35] state that a linear softening is adequate for modelling the physical phenomena occurring during damage propagation in the EPZ. For this purpose, within the present study, no efforts were made to utilize a non-linear softening function and thus a linear description (Equation (5)) has been adopted.…”

“…A step forward has been made with the introduction of the well-known cohesive elements to the simulation of adhesive joints, under the framework of Cohesive Zone Modeling (CZM) techniques [19,20,21,22,23,24,25]. This methodology allows the study of the debonding initiation and propagation process, without considering the presence of initial flaws and leads to the calculation of the load carrying capacity of the considered adhesive joint [2].…”

“…The current work is an extension of the proposed T-S law developed by Anyfantis and Tsouvalis in [20] which accounts for Mode I and II in a 2-dimensional space. It is noteworthy that the proposed model cannot distinguish between the fracture type (cohesive or adhesive), since the entire adhesive layer is modelled by cohesive elements that do not provide stress variations through-the-adhesive thickness.…”

Fracture mechanics‐based progressive damage modelling of adhesively bonded fibre‐reinforced polymer joints

“…10 Damage initiation and propagation can be both simulated with the cohesive zone models (CZMs). [11][12][13][14][15] An iterative numerical process to simulate the experimental global response, 16,17 requiring significant computational efforts is typically conducted for the estimation of the cohesive law parameters.…”