Abstract
The development of additive manufacturing technology leads to new concepts for design implants and prostheses. The necessity of such approaches is fueled by patient-oriented medicine. Such a concept involves a new way of understanding material and includes complex structural geometry, lattice constructions, and metamaterials. This leads to new design concepts. In the article, the structural design method is presented. The general approach is based on the separation of the micro- and macro-mechanical parameters. For this purpose, the investigated region as a complex of the basic cells was considered. Each basic cell can be described by a parameters vector. An initializing vector was introduced to control the changes in the parameters vector. Changing the parameters vector according to the stress-strain state and the initializing vector leads to changes in the basic cells and consequently to changes in the microarchitecture. A medium with a spheroidal pore was considered as a basic cell. Porosity and ellipticity were used for the parameters vector. The initializing vector was initialized and depended on maximum von Mises stress. A sample was designed according to the proposed method. Then, solid and structurally designed samples were produced by additive manufacturing technology. The samples were scanned by computer tomography and then tested by structural loads. The results and analyses were presented.
Highlights
The modern approach for design implants and prostheses implies patient-oriented solutions
It is obvious that additive manufacturing and patient-oriented design can notably increase the quality of the medical treatments
We propose that the stiffness tensor can be presented as a function of the parameters vector, the initializing vector, and the spatial coordinate:
Summary
The modern approach for design implants and prostheses implies patient-oriented solutions. The widespread approach is to use representative volumes to determine the fabric tensor and the effective mechanical properties [15,16]. It has been shown [17,18,19] that implants interact with bone tissue and that the structure and the microstructure of the implant influence the quality of this interaction. The ability to design material within a product opens up new possibilities in patientspecific prostheses [24,25] The complexity of such an approach appears in defining the external loads and the formulation criteria of the design [26,27]. The designed and regular constructions were manufactured and compared in natural experiments
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