Kreative Methoden

Lachmayer, Roland; Ehlers, Tobias; Lippert, René Bastian

doi:10.1007/978-3-662-65924-3_4

Cited by 1 publication

(1 citation statement)

References 89 publications

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“…Since the stiffness depends on the density of the implant and the density mainly affects the elastic modulus E implant , this relationship must be determined by a density-dependent material law. To represent the material behavior of the density-reduced elements, a body-centered (BC) cell is chosen in this work due to its straightforward geometry, adaptability through parametric adjustments, and compatibility with additive manufacturing techniques without support structures 8 . To determine the mechanical substitute model of the BC unit cell, the elastic modulus is assessed for various densities using the asymptotic homogenization outlined by Dong et al 34 .…”

Section: Homogenized Fe Modelsmentioning

confidence: 99%

Development of a density-based topology optimization of homogenized lattice structures for individualized hip endoprostheses and validation using micro-FE

Müller,

Synek,

Stauß

et al. 2024

Sci Rep

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Prosthetic implants, particularly hip endoprostheses, often lead to stress shielding because of a mismatch in compliance between the bone and the implant material, adversely affecting the implant’s longevity and effectiveness. Therefore, this work aimed to demonstrate a computationally efficient method for density-based topology optimization of homogenized lattice structures in a patient-specific hip endoprosthesis. Thus, the root mean square error (RMSE) of the stress deviations between the physiological femur model and the optimized total hip arthroplasty (THA) model compared to an unoptimized-THA model could be reduced by 81 % and 66 % in Gruen zone (GZ) 6 and 7. However, the method relies on homogenized finite element (FE) models that only use a simplified representation of the microstructural geometry of the bone and implant. The topology-optimized hip endoprosthesis with graded lattice structures was synthesized using algorithmic design and analyzed in a virtual implanted state using micro-finite element (micro-FE) analysis to validate the optimization method. Homogenized FE and micro-FE models were compared based on averaged von Mises stresses in multiple regions of interest. A strong correlation (CCC > 0.97) was observed, indicating that optimizing homogenized lattice structures yields reliable outcomes. The graded implant was additively manufactured to ensure the topology-optimized result’s feasibility.

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Section: Homogenized Fe Modelsmentioning

confidence: 99%