PSI - Issue 47

Duc Quan Pham et al. / Procedia Structural Integrity 47 (2023) 945–951

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Pham Duc Quan et al. / Structural Integrity Procedia 00 (2019) 000–000

fracture has drawbacks. Because the rods located near the fracture site will penetrate the bone tissue, which has changes in biomechanical characteristics. This is due to the formation of a zone of shock wave osteoporosis and decreases with distance from the defect. Therefore, it is important to modernize the RAEF taking into account the drawbacks, which will improve the quality of patient treatment. The best method of researching RAEF’s to obtain appropriate results for their modernization is a full-scale experiment. Nevertheless, it is not always possible to conduct full-scale experimental studies to determine the stiffness of osteosynthesis systems due to their complexity. Thus, to solve the problems, as an alternative to experimental studies, the deformation processes of the tibia-external fixation device systems with different arrangements of rods were modelled by modern computer tools using CAD/CAE methods to get the strength, stiffness, and stress-strain state of biomechanical systems. 2. Problem Specification Numerical simulation of the "Bone – RAEF " system was carried out using the ANSYS Workbench software complex. The tibia with an external fixation device, shown in Fig. 1.

Fig. 1. The system “Bone – RAEF”.

In order to understand the options of modernization, 4 options of the placement of the rods (Fig. 2) of the studied model were considered. Data from computer tomography images of the bone were used to build 3D bone model.