This paper proposes an approach to defining the path of a curved crack in a single edge notched specimen with gray level residuals extracted from digital image correlation, followed by the calibration of the parameters of a cohesive zone model. Only the experimental force is used in the cost function minimized via finite element model updating. The displacement and gray level residual fields allow for the validation of the calibrated parameters. Last, the results are confronted with those given by a straight crack to highlight the benefits of accounting for the actual crack path.
Background. The mechanical response and damage mechanisms of het-1 erogeneous cementitious materials result from the mechanical properties of their 2 A. Tsitova, F. Bernachy-Barbe (formerly), B.
The safety of double wall Concrete Containment Buildings (CCBs) primarily depends on the integrity of concrete. The delayed deformations of concrete induced by creep and shrinkage cause the loss of pre-stress that may reduce the air-tightness of the CCB internal wall in accidental conditions. Creep of concrete is a complex phenomenon and its rate depends on several factors among which microcracking is of major significance. To be able to represent effectively creep/microcracking couplings in concrete with a mesoscale numerical model, a reliable damage model has to be primarily defined. The phase field method for the modeling of fracture in brittle materials implemented in the finite element software Cast3m is chosen as a basis. The interest of the study is to identify consistent phase-field parameters for mortar and cement paste. The study is carried out by comparison of experimental and numerical three-point notched bending tests using experimental elastic properties and boundary conditions measured with Digital Image Correlation (DIC). Parameter identification is performed using DIC measurements on three-point notched beam bending tests and validated in 3D cases.
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