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Optimisation topologique de structures lattices à base de surface minimale triplement périodique en Ti-6Al-4V pour implants osseux humains obtenus par fabrication additive

Abstract : Lattice structures offer the opportunity to control the mechanical properties of the structures they replace. From a mechanical point of view, the use of lattices in orthopedic implants is then a promising solution to the stress shielding problem that may occur postoperatively. Apart from the widely known strut-based lattices, the Triply Periodic Minimal Surfaces (TPMS) concept has been introduced to create surface-based lattices with tailored mechanical properties. Eight TPMS-based and two strut-based unit cell topologies have been numerically investigated to compute their apparent elastic properties and local stress distribution, considering a periodic homogenization method. The topology-dependence of the local stress distribution is highlighted by a statistical analysis of the unit cells. The validation of the numerical results has been performed by experimentally-obtained results following the fabrication of several lattices by an SLM machine and compression testing. Two solicitation types were investigated: a functional case emphasizes on the apparent Young modulus of lattices, and a destructive case focusing on fracture mechanism. According to all previous results, a numerical partial replacement of a real bone subjected to real boundary conditions by a TPMS-based unit cell is proposed according to various mechanical requirements.
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https://pastel.archives-ouvertes.fr/tel-03707088
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Submitted on : Tuesday, June 28, 2022 - 11:39:12 AM
Last modification on : Thursday, September 15, 2022 - 9:50:56 AM

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  • HAL Id : tel-03707088, version 1

Citation

Chrysoula Chatzigeorgiou. Optimisation topologique de structures lattices à base de surface minimale triplement périodique en Ti-6Al-4V pour implants osseux humains obtenus par fabrication additive. Mécanique des matériaux [physics.class-ph]. HESAM Université, 2022. Français. ⟨NNT : 2022HESAE011⟩. ⟨tel-03707088⟩

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