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Stiffness Analysis of the External Fixation System at Axial Pressure Load

Pervan Nedim, Mešić Elmedin, Muminović Adis J., Delić Muamer, Muratović Enis

Advances in Science and Technology. Research Journal

2022

Vol. 16, no 3

226--233

The paper analyzes the stiffness of the Orthofix external fixation system at axial pressure load, applied to the lower leg in case of an unstable fracture. Based on the actual construction of the Orthofix fixator, its 3D model was formed, and then a structural analysis was performed in the CATIA V5 software system. The aim of this paper is to investigate the mechanical properties of Orthofix fixator. FEM analysis of the fixator revealed displacements at characteristic points of the structure and fractures. During the FEM analysis, it is possible to change the load values, all with the aim of obtaining the best possible information about the behavior of the fixator during installation and use by the patient. Based on the results obtained from the FEM analysis, it can be concluded that the Orthofix fixative shows very good stiffness, but also that it can be improved by using newer materials, such as composite or some alloys of titanium and aluminum.

Analysis of Mechanical Stability for External Fixation Device in the Case of Anterior-Posterior Bending

Pervan Nedim, Muminović Adis J., Mešić Elmedin, Delić Muamer, Muratović Enis

Advances in Science and Technology. Research Journal

2022

Vol. 16, no 3

136--142

Analysis of mechanical stability for external fixation device Orthofix in the case of anterior-posterior bending is carried out in this paper. Device is applied to the lower leg for the case of unstable fracture. Real device is measured and 3D CAD model is developed. CAD model is used for numerical structural stress analysis which is carried out using CATIA V5 software. Results for displacements are obtained for selected critical places on the device and for the place of fracture. In addition, values of principal and von Misses stresses are obtained and analyzed. Using obtained results, conclusions about mechanical stability of device are formulated.

Structural Size Optimization of External Fixation Device

Mešić Elmedin, Muminović Adil, Čolić Mirsad, Petrović Marin, Pervan Nedim

Advances in Science and Technology. Research Journal

2020

Vol. 14, no 2

233-240

Structural size optimization of a device for external bone fixation within a formed iterative hybrid optimization algorithm was presented in this paper. The optimization algorithm was in interaction with the algorithms for generative design and FEM analysis and completely integrated within CATIA CAD/CAM/CAE system. The initial model, representing the current design of the bone external fixation device Sarafix, was previously verified by experimental testing. The formed hybrid optimization algorithm was created as an integration of the global (SA method) and local (CG method) algorithm. The constraints of the optimization model are the clinical limitations of the interfragmentary displacements and the material strength. The optimized design has less weight, greater rigidity and less transverse interfragmentary displacements at the point of fracture compared to the current design.