BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI

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62 Marius Catană and Daniela Tarniţă Special methods were used to mesh elements bolt type, method "Sweep" automatically controls the direction of formation of elements from source to target, complicated areas, narrow and difficult and discretized mesh of tetrahedra. For cartilage and menisci have used items such as bolt and the femur, tibia, fibula or used with node tetrahedral elements in the middle. Fig.3 – Support "Remote Displacement" model that allows rotation of the head of the tibia and fibula after distal axis Y. Tabel 1 Mesh nodes and elements on components Geometric component Number of nodes Number of elements Femur 185,402 58,604 Cartilage femur 80,036 22,061 Tibia 127,919 38,401 Cartilage tibie 33,787 8,795 Lateral meniscus 8,182 2,596 Medial meniscus 7,965 2,519 Peroneu 39,118 12.876 Cartilage peroneu-tibie 6,678 2.365 LCM 6449 2223 LCL 7876 2747 LIA 1,660 620 LIP 1,885 679 Total 488,092 148,397 For efficient discretization for this analysis we used elements of size 1 or 1.5 mm for areas of greatest interest, the possible transition (transition) from this to a larger size through options "Smoothing" the environment and "Transition" on fast, for each component added a dimension element "element size", obviously a smaller contact areas tibio-femoral, and greater the jamb. For
Bul. Inst. Polit. Iaşi, t. LVIII (LXII), f. 3, 2012 63 areas of less interest used elements of 4mm. Finer mesh or higher but can be attributed to solid components and parts thereof, that surfaces (faces) or lines. For contacts between components of this analysis used contact type "Bonded" and "NoSeparation". Calculation algorithm is used to contact type "AugmentedLagrange" is used here a detection refer the identical "On Gauss Points". To better understand these contacts have given option "Pindball Region" with a radius of 0.1mm, which means that before you come into contact, the solver to impose a more efficient mathematical representation of these contact areas. Fig. 4 – Network of nodes and elements - Mesh geometrical model wiht nodes and elements. The linear material properties (Bae, 2012), (Kubicek, 2009) used whitin this study are shown in the Table 2. Tabel 2 Material properties for components Geometriy Young’s Modulus Mpa Poisson’s ratio Cortical – Femur bone 18600 0.3 Cortical – Tibie bone 12500 0.3 Spongio bone 500 0.3 Cartilage 12 0.475 Meniscus 59 0.49 LCM 10 0.49 LCL 10 0.49 LIP - LIA 1 0.49 For the set of materials values was calculated Von Misses, total and directional movements and deformations that occur both but the whole ensemble as well as the individual components. Due to subjected load 800N, the eqhilibrum of the forces in the knee joint was achieved for lateral displacement of 1.23 mm (Fig. 5). Because of this
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BULETINUL INSTITUTULUI POLITEHNIC D
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BULETINUL INSTITUTULUI POLITEHNIC D
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