Identification algorithm for fracture parameters by combining DIC and FEM approaches

Abstract

This research program focuses on a hybrid experimental and numerical approach to identifying the mechanical state in the vicinity of a crack. The digital image correlation, as corrected by interpolating a theoretical displacement field, enables determining the crack opening intensity factors representative of the kinematic state of crack lips. A finite element model is introduced for calculating stress intensity factors. The parallelism derived from the DIC method and FEM approach is presented by means of a specific identification algorithm that allows computing the energy release rate within a common finite element mesh. This algorithm is then illustrated by testing the opening-mode configuration for a PVC sample.

Influence of Wooden Board Strength Class on the Performance of Cross‐laminated Timber Plates Investigated by Means of Full‐field Deformation Measurements

“…A lot of research work has also been performed to improve respective optimise the algorithms needed for digital image correlation . Because of their user‐friendliness systems, digital image correlation has proven to be a perfect tool for comprehensive assessment of displacements and strains being opposed to results from numerical simulation, e.g., in fracture mechanics .…”

Harmonizing PCN reporting on extended airport maneuver areas

“…This technique has been deployed since 1980 in order to deepen knowledge about the determination of crack opening (Sutton et al, 1983;Roux et al, 2009;Hild and Roux, 2006;Pop et al, 2011, Buttlar et al, 2014. The principle of this technique is to follow the positional changes of a speckled pattern located on the sample surface.…”

Mechanical and fracture properties of particleboard

“…Fewer investigations were carried out on mixed mode fracture toughness of PB and MDF, [13]. Today, several fracture approaches such as the Stress Intensity Factor (SIF) [14][15][16], the Crack Relative Displacement Factor (CRDF) [17][18][19][20] or the energy release rate [21][22][23][24] allow expressing fracture criteria. It should also be noted that usually the damage level could be evaluated from a local approach based on the mechanical fields assigned by the crack tip singularity or by a global approach using the mechanical fields far to the crack tip singularity.…”

“…As will be shown latter the CRDF allows definition of the kinematic state around to the crack tip. As defined by Dubois et al [17,18], Pop et al [19] and Jamaaoui et al [25], the crack opening state represents the relative displacement between two points positioned on the upper and the lower crack flanks. Its evaluation can be performed directly from the experimental measurements.…”