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研究生(外文):JUI-PIN HUNG
論文名稱(外文):The Mechanical Study on the Contact Wear Behavior in Artificial Hip Prostheses
指導教授(外文):J.S.S. WU
中文關鍵詞:人工髖關節聚乙烯髖臼杯磨耗 速率
外文關鍵詞:Artifical Hip JointAcetabular CupWear Rate
  • 被引用被引用:4
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本文主要研究項目包括 1.髖關節磨耗機制之實驗文獻探討與分析模式2.建立磨耗分析模式並建立銷對盤磨耗試驗模型進行驗證 3.聚乙烯髖臼杯與金屬及陶瓷關節頭之磨耗分析4.聚乙烯髖臼杯與金屬關節頭之衝擊磨耗 5.聚乙烯髖臼杯接觸破裂分析。
In this study, a numerical simulation technique based on three-dimensional finite element contact model and modified Archard’s wear law was proposed to analyze the wear behavior and contact characteristics at the articulating surface of artificial hip prosthesis. For polyethylene acetabular cup against metallic or ceramic heads, current results showed that the estimated wear rates were very closed to the results obtained from clinical measurements and experimental data available in literature. Furthermore, the ratio of wear rates for polyethylene cups against alumina and the metallic femoral heads was 0.5, which agreed well with that deduced from clinical studies or laboratory hip simulators.
Concerning the contact characteristic at the articulating surface, results from finite element analysis showed that the polyethylene acetabular cup was subjected to cyclic loading under normal walking condition. Meanwhile, the maximum principal stress within the acetabular cups is less then the yielding strength. Under such low stress state, the sliding wear was considered as the dominant mechanism of surface damage. However, higher tensile stress was induced when the non-conforming articulating surface was formed owing to surface wear. It has been proved that for acetabular cup with embedded surface crack the stress intensity factor around surface crack will exceed the fatigue threshold of the material. At this moment, that may enable the inception of crack propagation and will cause the bearing surface to break away, which was the mechanism of fatigue wear.
For the investigation on polyethylene wear rate, the proposed numerical approach can provides a more efficient and reliable manner than wear tests on hip simulators or clinical observations, which take considerable time and expense. It is believed that current analysis model also contributes to further investigation on wear problem and future design improvements of the hip prostheses.
中文摘要 Ⅰ
誌謝 Ⅲ
CHAPTER 1 : Introduction 1
1.1 Overview of total artificical hip prostheses 1
1.2 Overview of total artificical hip prostheses 2
1.3 State of the purpose 3
1.4 Organization of this dissertation 4
CHAPTER 2 : Wear Analysis Model 8
2.1 Wear mechanism in hip prostheses 8
2.2 Wear model 11
2.3 Contact stress 13
CHAPTER 3 : Validation of the Wear Analysis Model 16
3.1 Introduction 16
3.2 Materials and method 17
3.2.1 Pin-on-disk model 17
3.2.2 Computational processes 19
3.3 Results and discussion 20
CHAPTER 4 : Wear Simulation for UHMWPE Acetabular Cup against Metallic Femoral Head 24
4.1 Introduction 24
4.2 The artificial hip joint model 25
4.3 Computational processes 30
4.4 Results and discussion 33
4.4.1 Contact stress 33
4.4.2 Wear rates 38
4.5 Conclusion 48
CHAPTER 5 : Comparative Study on Wear Behavior of UHMWPE Acetabular Cup against Metallic and Ceramic Head 50
5.1 Introduction 50
5.2 Material and method 51
5.2.1 Model description 51
5.2.2 Computational process 53
5.3 Results and discussion 54
5.4 Conclusion 64
CHAPTER 6 : Investigation for Impact Effect on Wear Behavior in Total Hip Prosthesis 666
6.1 Introduction 66
6.2 Impact-contact status 70
6.3 Wear Estimation 72
6.3.1 Model description 72
6.3.2 Computational process 73
6.4 Results and discussion 75
6.4.1 Contact stress 75
6.4.2 Wear rate 81
6.5 Conclusion 85
CHAPTER 7: Contact Fracture Analysis of UHMWPE Acetabular Cup against Ceramic Head 87
7.1 Introduction 87
7.2 Calculation of stress intensity factor 89
7.3 FEM crack analysis 93
7.4 Results and discussion 98
7.5 Conclusion 111
CHAPTER 8 : Conclusion and Suggestion for Future Researches 112
8.1 Conclusion 112
8.2 Suggestions for future researches 114
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