臺灣博碩士論文加值系統

本研究旨在設計一種具有彎曲特徵的新型骨板植入物，並進行FEA 用於觀察板與裝配組件的總變形、等效 (von Mises) 應力和等效彈性應變。 新骨板的設計是根據人體股骨的尺寸開發的，增加了一些圓形特徵和4.5mm的皮質螺釘孔。 在板 FEA 上，板的背面固定，負載施加在螺釘孔表面上。 在裝配組件 FEA 上，固定骨骼的遠端並研究軸向和彎曲加載條件。 FEA 結果顯示傳統設計和新的設計在彎曲 10° 時都是較好的，其中新的 10° 骨板具有最低的總變形。 軸向載荷下的裝配組件模擬顯示該兩個板彎曲 20° 時獲得較佳的結果，新型 20° 板具有最低的等效 (von Mises) 應力。 然而，彎曲載荷下的裝配組件模擬顯示出更多變化的結果。 換句話說，雖然新的設計在軸向載荷下的板和組件模擬上都顯示很好的結果，但該兩種骨板設計在彎曲載荷下都表現得不穩定。

This research aims to design a novel bone implant with a bending feature. FEA is performed to observe the total deformation, equivalent (von Mises) stress, and equivalent elastic strain of both the plate and the assembly. The novel design is developed based on the size of the human femur bone, adding some circular feature and 4.5mm cortical screw holes. On the plate FEA, the back surface of the plate is fixed and load is applied on the screw hole surfaces. On the assembly FEA, the distal end of the bone is fixed and axial and bending loading conditions are studied. FEA shows both traditional and novel design are the best when bent for 10°, with the novel 10° plate has the lowest total deformation. The assembly simulation under axial load shows the best result achieved by both plates bent for 20°, with the novel 20° plate has the lowest equivalent (von Mises) stress. However, the assembly simulation under bending load shows a more varied result. In other words, while the novel design shows an outstanding result on both plate and assembly simulation under axial load, both bone plate designs are not stable under bending load.

摘要...............................................................................i
Abstract..........................................................................ii
Acknowledgements.................................................................iii
Table of Contents.................................................................iv
List of Tables....................................................................vi
List of Figures..................................................................vii
Symbols..........................................................................xix
Chapter 1 Introduction.............................................................1
1.1. Background.................................................................1
1.2. Motivation.................................................................1
1.3. Research Purpose...........................................................2
1.4. Research Limitations.......................................................2
Chapter 2 Literature Review........................................................3
2.1. Introduction...............................................................3
2.2. Bone.......................................................................3
2.2.1. Bone material..............................................................3
2.2.2. Bone Fracture..............................................................4
2.3. Bone Implant...............................................................4
2.3.1. Dimension..................................................................4
2.3.2. Material...................................................................4
2.4. Fixation Method............................................................5
2.5. Load on Human Femoral Bone.................................................6
2.6. Finite Element Analysis....................................................7
2.7. Concluding Remarks.........................................................8
Chapter 3 Methodology..............................................................9
3.1. Introduction...............................................................9
3.2. Traditional Bone Plate Developed with Middle Curvature.....................9
3.3. Newly Designed Bone Plate Developed with Middle Curvature.................10
3.4. Fitting Test (Assembly)...................................................12
3.4.1. Simplified Screw Model....................................................14
3.4.2. Bone Model................................................................14
3.5. Finite Element Analysis...................................................15
3.5.1. Boundary Condition for Bone Plate Simulation..............................16
3.5.2. Boundary Condition for Assembly Simulation................................17
3.5.3. Meshing...................................................................18
3.6. Concluding Remarks........................................................19
Chapter 4 Result and Discussion...................................................20
4.1. Introduction..............................................................20
4.2. Design Feature and Function of the Novel Bone Plate.......................20
4.3. FEA Result of Bone Plate..................................................21
4.3.1. Traditional Bone Plate Simulation.........................................22
4.3.2. Newly Designed Bone Plate Simulation........................................................................29
4.3.3. Comparison between the traditional bone plate and the newly designed bone plate.............................................................................37
4.4. FEA Result of Bone Plate Assembled with Bone Model and Screw Model with Bonded Contact Condition..........................................................40
4.4.1. FEA Result of Bone Model Simulation.......................................41
4.4.2. Traditional Bone Plate Assembly Simulation................................43
4.4.3. Newly Designed Bone Plate Assembly Simulation.............................66
4.5. Comparison................................................................88
4.5.1. Comparison between axial loading and bending loading......................89
4.5.2. Comparison between the traditional bone plate and the newly designed bone plate under both axial and bending loading........................................91
4.6. Concluding Remarks........................................................96
Chapter 5 Summary, Conclusion and Recommendation..................................98
5.1. Summary...................................................................98
5.2. Conclusion................................................................98
5.3. Recommendation............................................................99
References.......................................................................101
Appendix I.......................................................................105
Appendix II......................................................................106
Appendix III.....................................................................107
Appendix IV......................................................................108
Extended Abstract................................................................109

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