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研究生:潘國興
研究生(外文):QUOC-HUNG PHAN
論文名稱:PAA-Alg-Si水膠於單軸與雙軸荷重下的機械性質於探討
論文名稱(外文):Investigation of PAA-Alg-Si Hydrogel Mechanical Properties under Uniaxial and Biaxial Load
指導教授:劉乃上
指導教授(外文):Nai-Shang lious
學位類別:碩士
校院名稱:南台科技大學
系所名稱:機械工程系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:80
中文關鍵詞:水膠超彈性本構方程
外文關鍵詞:hydrogeluniaxial tensile testbiaxial tensile testhyperelasticity
相關次數:
  • 被引用被引用:0
  • 點閱點閱:120
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  • 下載下載:18
  • 收藏至我的研究室書目清單書目收藏:0
水膠因為具有良好的生物組織相容性,因此被廣泛應用於醫療用途。最近所開發的紫外光聚合PAA-Alg-Si (Polyacrylic acid-Alginate-Silica) 水膠具有低摩擦係數和高機械強度等特點,因而有應用於修補損壞關節軟骨之潛力。本研究對含有不同 PAA 重量百分(3%和5%)與不同Silica重量百分比(0%, 6%, 9%, 12% 和16%) 的紫外光聚合PAA-Alg-Si水膠於單軸負載與雙軸負載之下的機械性質進行探討。在本研究中發現紫外光聚合的PAA-Alg-Si水膠其PAA重量百分及Silica重量百分比對其機械強度與應力應變曲線特性有相當影響。此外在本研究中也發展了適合描述水膠於單軸、雙軸變形之下應力-應變關係的超彈性本構方程式模型。
Articular cartilage is a highly organized avascular tissue and could be injured as a result of sports related trauma. It has very limited capacity for repair due to its avascular nature. Medical treatments for injured articular cartilage are required in many circumstances. Hydrogels have inherently weak mechanical strength. However, the advantages of bio-compatibility and hydrophilicity make hydrogels become biomaterials for many medical applications. Recent advances in the development of high strength hydrogels for new load-bearing medical applications such as repair of damaged articular cartilage necessitate the mechanical properties investigation of these hydrogels. Developing suitable constitutive equations for hydrogels is also important for these applications. In this research, mechanical properties, under tensile load, of new developed UV polymerized Poly acrylic acid-Alginate-Silica (PAA-Alg-Si) hydrogels with different weight percentages of PAA (3% and 5%) and Silica (0%, 3%, 6%, 9%, 12% and 16%) were investigated. These hydrogels have potential for repairing the damaged articular cartilage due to its low friction and high mechanical strength. Mechanical properties of hydrogels were investigated under uniaxial and biaxial load. The experiments were performed with a loading displacement rate of 0.2mm/sec. It can be seen from the stress-strain relations of these hydrogels that the mechanical properties of PAA-Alg-Si hydrogels are strongly dependent on the weight percentages of Silica and PAA in PAA-Alg-Si hydrogels. Furthermore the uniaxial and biaxial stress-strain relations of aforementioned hydrogels were fitted to hyperelastic constitutive models. Good agreements between experiment/numerial/analytical results were obtained. It can be seen that the imcompressible hyperelastic models is suitable for these hydrogels.
ABSTRACT……………………….. 2
ACKNOWLEDGEMENTS……….. 3
TABLE OF CONTENTS………...………………………………………………………4
LIST OF TABLES…………………. 5
LIST OF FIGURES……………….. 6
CHAPTER 1: INTRODUCTION…. 8
1.1 Research motivation 8
1.2 Mechanical tests of hydrogels 9
1.3 Method to investigate PAA-Alg-Si mechanical properties 11
CHAPTER 2: HYPERELASTIC MATERIAL BEHAVIOR 12
2.1 Hyperelastic models of hydrogels 12
2.2 Hyperelasticity 13
2.3 Isotropic Hyperelasticity 15
2.5 Incompressible hyperelastic material and polynomial form 16
2.5.1 Incompressible Elasticity 16
2.5.2 Polynomial form 17
CHAPTER 3: UNIAXIAL AND BIAXIAL EXPERIMENTS 19
3.1 Experimental setup 19
3.2 Material and method 20
3.2.1 Material 20
3.2.2 Experimental method 21
3.3 Least squares fit method 22
3.3.1 Uniaxial tensile test 23
3.3.2 Biaxial tensile test 25
CHAPTER 4: EXPERIMENTAL RESULTS 27
4.1 Uniaxial tensile experimenal results 27
4.2 Biaxial tensile experimental results 42
4.3 Finite element method results and comparision 61
CHAPTER 5: DISCUSSION AND CONCLUSION 74
REFERENCE……………………… 76
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