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頁籤選單縮合
題名 | The Effect of Material Inhomogeneous for Femoral Finite Element Analysis=股骨非均質材料特性對有限元素分析之影響 |
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作者 | 張志涵; 許瑞廷; 陳守義; 陳文斌; 張冠諒; | 書刊名 | Journal of Medical and Biological Engineering |
卷期 | 22:3 2002.09[民91.09] |
頁次 | 頁121-128 |
分類號 | 410.1644 |
關鍵詞 | 有限元素法; 股骨; 非均質性; 三點彎距; Finite element method; Femur; Heterogeneous; Three-point bending test; |
語文 | 英文(English) |
中文摘要 | 有限元素模擬中,模型建立的好壞是影響模擬正確性與否的重要因素。影響模型好壞的因素很多,在骨科生物力學中,骨骼材料性質的設定是一重要因素。以往研究中有限元素模擬模型大多是假設骨骼為均質性或近似非均質性的材料,但這和骨骼非均質的特性有很大的不同,若以多組不同彈性係數來模擬骨骼的非均質性,則需要有幾組才是恰當?當組數不同時其影響又為何?都有待探討。本研究以相同幾何外型但不同材料數目的股骨有限元素模型,以三點彎距(three-point bend)位移量的比對,探討股骨有限元素分析中皮質骨(cortex)材料非均質性的影響。模型中材料性質的判定,是利用電腦斷層掃瞄影像的亮度值和彈性係數(elastic modulus)關係轉換而得,由最多種材料數目開始做不同程度的減少,探討模型中材料數目對模擬結果影響的分析。並且以成兔股骨實驗量測three-point bending位移量,和對應的有限元素模型分析比較。結果顯示,模擬分析three-point bending之位移量會隨著模型材料數目減少而下降,比對實驗結果,建議在做骨骼有限元素模擬時,皮質骨的材料數目最少要超過60種,才可以得到位移量有5%收斂。 |
英文摘要 | The accuracy of a finite element simulation depends mostly on the mesh model. Many parameters influence the precision of a finite element mesh. In orthopedic biomechanics, the material property of bone is one of the major parameters in the simulation, especially the heterogeneous of cortex and cancellous bone. The common approach to simulate the heterogeneous of bone is to model with several sets of elastic modulus for the bone material. However, the required set numbers of elastic modulus to obtain a feasible solution is still unclear for bone structure. The objective of this study was therefore to investigate the necessary of heterogeneous femoral material for finite element simulation. Three rabbit femora were selected as the target subjects and three-point bending test was used as the loading mode. Experimental measurement of the displacement value under the three-point bending test was used as the reference point for justification the analytical results and convergence. The results indicated that the displacement value decreased as the set number of cortex elastic modulus reduced. To achieve a 5% absolute convergence for displacement, a minimum of 60 sets of cortex bone elastic modulus is required. |
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