Browsing by Author "Garcia-Herrera, Claudio"

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    Computational Shape Design Optimization of Femoral Implants: Towards Efficient Forging Manufacturing
    (2024) Tuninetti, Victor; Fuentes, Geovanni; Onate, Angelo; Narayan, Sunny; Celentano, Diego; Garcia-Herrera, Claudio; Menacer, Brahim; Pincheira, Gonzalo; Garrido, Cesar; Valle, Rodrigo
    Total hip replacement is one of the most successful orthopedic operations in modern times. Osteolysis of the femur bone results in implant loosening and failure due to improper loading. To reduce induced stress, enhance load transfer, and minimize stress, the use of Ti-6Al-4V alloy in bone implants was investigated. The objective of this study was to perform a three-dimensional finite element analysis (FEA) of the femoral stem to optimize its shape and analyze the developed deformations and stresses under operational loads. In addition, the challenges associated with the manufacturing optimization of the femoral stem using large strain-based finite element modeling were addressed. The numerical findings showed that the optimized femoral stem using Ti-6Al-4V alloy under the normal daily activities of a person presented a strains distribution that promote uniform load transfer from the proximal to the distal area, and provided a mass reduction of 26%. The stress distribution was found to range from 700 to 0.2 MPa in the critical neck area of the implant. The developed computational tool allows for improved customized designs that lower the risk of prosthesis loss due to stress shielding.
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    Hybrid numerical-experimental strategy for damage characterization of SAE 1045 steel
    (2023) Aranda, Pedro Miguel; Garcia-Herrera, Claudio; Celentano, Diego; Tuninetti, Victor; Toro, Sebastian Andres; Landeros, Felipe
    In this work, the elastoplastic behavior with continuous mechanical damage in a SAE 1045 steel is characterized using mainly torsional tests and simulations. A numerical-experimental inverse analysis procedure is proposed to fit a von Mises-type elastoplastic model and a Lemaitre-type continuous damage model to the material's mechanical response obtained in torsional tests. A FEM simulation campaign is carried out to calibrate the damage model, considering a two-step linear evolution of the damage variable in terms of the degradation of the elastic torsional stiffness measured in cyclic torsional tests. The procedure is validated with a numerical- experimental comparison in tensile tests to demonstrate the validity of the solution in other loading paths. The numerical model obtained is used to analyze the local effects of the damage and its distribution in torsional and tensile tests.