PSI - Issue 47

Duc Quan Pham et al. / Procedia Structural Integrity 47 (2023) 945–951 Pham Duc Quan et al./ Structural Integrity Procedia 00 (2019) 000–000

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Fig. 2. (a) Standard; (b) Remote inner rods; (c) 75 degrees; (d) 60 degrees.

Reduction of research time at the first stages was achieved due to simplified models of the researched systems instead of the main one. Also, the correspondence of the results of the simplified model to the results of the main model was proved. Thus, the problem was considered in two setups: volume and rod. The volume setup is a solid 3D model of the real "Bone – RAEF" system, with using a bone model. Rod setup is also a solid 3D model, but with the use of metal rods instead of bone, because creating a bone model is a rather time-consuming process.

Fig. 3. (a) Volume setup; (b) Rod setup.

Numerical modeling of "Bone – RAEF" was carried out taking into account that bone tissue was assumed to be an isotropic elastic material. The mechanical properties of bone tissue were taken according to data from the references. Parts of the external fixation device were made of biologically inert material - Surgical stainless steel (316L), which is widely used in surgical operations. Characteristics are given in Table 1.

Table 1. Mechanical properties of the materials of the biomechanical system. Material E (MPa) ν Cortical bone 1,5*10 4 0,25 316L 2*10 5 0,3