Browsing by Author "Ponthot, Jean-Philippe"

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    Damage Prediction in the Wire Drawing Process
    (2024) Gonzalez, Alvaro; Cruchaga, Marcela; Celentano, Diego; Ponthot, Jean-Philippe
    In this study, the prediction of damage in the wire drawing process of 2011 aluminum alloy was investigated through both experimental and numerical methods. A comprehensive experimental setup was designed involving 20 cases of wire drawing with varying die angles (10 degrees, 15 degrees, 21 degrees, 27 degrees, and 34 degrees) and reductions (21%, 29%, 31%, and 38%). Each case was tested three times, and the drawing forces, as well as occurrences of wire breakage, were recorded. The mechanical behavior of the material was firstly characterized using uniaxial tensile tests, whose results were used to determine the material parameters of both the hardening Voce law and those of uncoupled and coupled damage models. Then, the numerical simulations of the wire drawing process were performed using a finite element model, accounting for axisymmetric conditions and mesh convergence analysis to ensure accuracy. The previously characterized damage models were applied to evaluate their fracture prediction capabilities. A novel presentation method using three-dimensional graphs was employed to indicate the level of damage for each angle and reduction, providing greater sensitivity and insight into the damage values. Good agreement between the experimental and numerical data was demonstrated for the bilinear coupled damage model, validating its effectiveness. This study contributes to a better understanding of damage prediction in the wire drawing process, with implications for improving industrial practices and material performance evaluations.
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    Mechanical Characterization of the Elastoplastic Response of a C11000-H2 Copper Sheet
    (2020) Pacheco, Matías; García-Herrera, Claudio; Celentano, Diego J.; Ponthot, Jean-Philippe
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    Simulation of the Marangoni Effect and Phase Change Using the Particle Finite Element Method
    (2021) Bobach, Billy-Joe; Boman, Romain; Celentano, Diego J.; Terrapon, Vincent E.; Ponthot, Jean-Philippe
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    The Triaxiality Effect on Damage Evolution in Al-2024 Tensile Samples
    (2024) Gonzalez, Alvaro; Celentano, Diego; Cruchaga, Marcela; Ponthot, Jean-Philippe
    The effect of triaxiality on the evolution of damage in Al-2024 aluminum cylindrical specimens is studied in this work. Uncoupled and coupled damage models, all of them explicitly dependent on triaxiality, are assessed and compared. These models are characterized by tensile tests on cylindrical specimens without notches, to obtain the material parameters for each model. The capability of each model to predict fracture when different positive triaxial conditions evolve is then evaluated through tensile tests on notched cylindrical specimens. In particular, the damage index, evaluated at the fracture strain level, is compared with the experimental results validating the models. Moreover, the triaxiality evolution in the different specimens is studied in order to assess its effect on damage, demonstrating that the fracture strain decreases at greater triaxiality values. Observations through scanning electron microscopy confirm this pattern; i.e., an increase in triaxiality reveals a shift in the fracture mechanism from a more ductile condition in the original specimens to a more brittle one as the notch radius decreases. In addition, bilinear damage evolution is proposed to describe the physical behavior of the material when the Lemaitre coupled model is considered. In such a case, special attention must be devoted to the material characterization since coupling between hardening material parameters and damage affects the results.