Identification of adhesive properties in GLARE assemblies using digital image correlation

Abstract

a b s t r a c tAn experimental-numerical methodology is introduced to identify the parameters of a cohesive law of an adhesive layer within a joined assembly on the basis of kinematic data provided by digital image correlation. Non-conventional experiments on joined samples were designed to generate within the assembly and the adhesive film complex strain and stress states close to those expected in-service and up to complete debonding. The modeling is developed with reference to the observed sub-domain in which the experimental boundary conditions are prescribed. The nonlinear behavior of the adhesive layer is described as a finite-thickness interface endowed with a mixed-mode cohesive law whose parameters are identified so as to match at best the measured displacement field.

Digital image correlation and fracture: an advanced technique for estimating stress intensity factors of 2D and 3D cracks

“…However, other quantities may be identified. For instance, cohesive laws are identified by using measured displacement fields [74,75], or enriched kinematics since they can be incorporated in the measurement basis. The analysis and modeling of fracture process zones is also made possible, especially when low or very low scale imaging techniques are considered.…”

Mechanics-aided digital image correlation

“…Further, boundary regularization has not received a lot attention. When comparing experimental and simulated displacement elds for identication or validation purposes, the raw measured boundary conditions are considered [21] or ltered [22]. They can also be parts of the unknowns in an integrated approach to DIC [23].…”

Identification algorithm for fracture parameters by combining DIC and FEM approaches

“…Another positive aspect of digital image correlation is the possibility it offers to create a finite element mesh from the results of experimental measurements and displacement supports (Fedele et al 2009). In this work, the DIC package Correla was used.…”

“…The experimental data lead to a finite element mesh generated with 4-node quadrilateral elements (Fedele et al 2009). It should be pointed out that mesh nodes are associated with the subset centers, as indicated in Fig.…”

“…As for boundary conditions, we would like to add certain clarifications. Several authors, like Fedele et al (2009), have adopted the experimental full-field from DIC as their boundary conditions. Knowing mechanical properties, this displacement field is employed in the stress and strain tensor evaluations, stress intensity factor being calculated with a J-integral method.…”