折紙是一種古老的科學(xué)藝術(shù),近年來,基于折紙的結(jié)構(gòu)設(shè)計(jì)受到普遍關(guān)注,本文將折紙圖案與薄壁結(jié)構(gòu)相結(jié)合,通過三種不同薄壁折紙結(jié)構(gòu)的研究與分析,以探究折紙薄壁結(jié)構(gòu)更廣泛的應(yīng)用。本文首先設(shè)計(jì)了多種不同幾何屬性的薄壁折紙管狀結(jié)構(gòu),以數(shù)值模擬的方式分析其在準(zhǔn)靜態(tài)軸向載荷作用下的后屈曲行為。通過分析塑性鉸鏈的形成與運(yùn)動(dòng)研究其在壓潰過程中塑性變形與吸能的關(guān)系。成功探索出移動(dòng)塑性鉸鏈對(duì)吸能效率的影響。其次,在塑性鉸鏈與折痕分析的基礎(chǔ)上,設(shè)計(jì)了一種箏形截面薄壁管狀吸能結(jié)構(gòu),其在準(zhǔn)靜態(tài)軸向載荷下可以得到非剛性伴隨模態(tài)的壓潰失效模式。使其能量吸收能力較傳統(tǒng)結(jié)構(gòu)高出29.2%,初始峰值載荷降低56.5%,同時(shí)使得沖擊過程更加平穩(wěn)。其更加優(yōu)秀的特性使其更加適合應(yīng)用于能量吸收裝置的設(shè)計(jì)與使用中。第三,在折痕分布與運(yùn)動(dòng)的基礎(chǔ)上,本文還詳細(xì)分析了waterbomb圖形的幾何特點(diǎn),剛性折疊條件下形成waterbomb折紙管的幾何條件。系統(tǒng)進(jìn)行了waterbomb折紙管的運(yùn)動(dòng)學(xué)分析,結(jié)構(gòu)分析,力學(xué)超材料特性分析以及機(jī)構(gòu)-結(jié)構(gòu)-機(jī)構(gòu)的運(yùn)動(dòng)轉(zhuǎn)化分析,為折紙超材料的應(yīng)用提供了理論基礎(chǔ)。最后,本文進(jìn)行了彈性硅膠平板在正交的兩個(gè)軸線下... 

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【學(xué)位級(jí)別】：碩士

【文章目錄】：
中文摘要
ABSTRACT
NOTATION
CHAPTER 1 INTRODUCTION
    1.1 Thin-walled Structures
    1.2 Origami Patterns
    1.3 Scope and Layout of Dissertation
CHAPTER 2 LITERATURE REVIEW
    2.1 Current Research on Origami Techniques
        2.1.1 Origami Mathematics
        2.1.2 Rigid Origami Patterns
    2.2 Thin-walled Tubes as Energy Absorbing Devices
        2.2.1 Background
        2.2.2 General Axial Crushing Stages and Performance Criteria
        2.2.3 Axial Crushing of Square and Polygonal Tubes
        2.2.4 Thin-walled Tubes with Origami Patterns
    2.3 Thin-walled Structures as Deployable Devices
        2.3.1 The Waterbomb Origami Tube
        2.3.2 The Deployable Antenna Reflectors
CHAPTER 3 THE ORIGAMI TUBE DESIGN: GEOMETRY ANDNUMERICAL ANALYSIS
    3.1 Origami Geometry
        3.1.1 Geometry of the Tachi Pattern
        3.1.2 Geometry of the Crash Box Pattern
        3.1.3 Geometry of the Derivative Origami Patterns
    3.2 Quasi-static Axial Crushing Modelling
        3.2.1 Finite Element Analysis
        3.2.2 Convergence Tests
    3.3 Numerical Simulation Results
        3.3.1 Origami Tubes with Tachi Pattern
        3.3.2 Origami Tubes with Crash Box Pattern
        3.3.3 Origami Tubes with Derivative Origami Patterns
    3.4 Summary
CHAPTER 4 THIN-WALLED TUBES WITH A KITE-SHAPE RIGIDORIGAMI PATTERNS
    4.1 Tube Geometry
    4.2 Numerical Simulation
        4.2.1 Finite Element Modeling
        4.2.2 Conventional Square Tube
        4.2.3 Origami tubes with the kite-shape pattern
        4.2.4 Geometry Optimization
    4.3 Theoretical Analysis
        4.3.1 Rigid Complying Mode
        4.3.2 Non-rigid Complying Mode
        4.3.3 Basic Folding Element I and II
        4.3.4 Basic Folding Element III and IV
        4.3.5 Theoretical Mean Crushing Force
    4.4 Summary
CHAPTER 5 THE WATERBOMB ORIGAMI TUBE
    5.1 Introduction of the Waterbomb Pattern
    5.2 Geometrical Analysis of the Waterbomb Origami Tube
        5.2.1 Pattern Geometry and Assumptions
        5.2.2 Conditions for a Rigidly Foldable Tube of a Uniform Radius
        5.2.3 Creation of a Tube by Rigid Folding from a Flat Sheet
    5.3 Kinematic Analysis Review of the Waterbomb Origami Tube
        5.3.1 The Waterbomb Origami Tube When m is Odd
        5.3.2 The Waterbomb Origami Tube When m is Even
    5.4 Numerical Analysis of the Waterbomb Origami Tube
        5.4.1 The Mechanism Mode
        5.4.2 The Mechanism-Structure-Mechanism Transition
    5.5 Summary
CHAPTER 6 ANALYSIS OF CROSS FOLDING A SURFACE
    61 Modelling in ABAQUS
        6.1.1 Folding Scheme
        6.1.2 Loading methods and Boundary Conditions
        6.1.3 Material Properties and ABAQUS Setting
    6.2 Positions of Controlling Rigid Bodies and Curvature
        6.2.1 Deformed Shape after Step 1
        6.2.2 Deformed Shape after Step 2 Folding
    6.3 Mechanical Analysis
        6.3.1 Study of the Thin Surface after the First Folding (Step 1)
        6.3.2 Study of the Thin Sheet after the Second Folding (Step 2)
    6.4 The Effects of Shell Thickness
        6.4.1 Deformed Shapes and Shell Thickness
        6.4.2 Elastic strain energy along the defined path and shell thickness
    6.5 Peak Stress Relieve Methods
        6.5.1 Central Hole Method
        6.5.2 Slit Method
CHAPTER 7 FINAL REMARKS
    7.1 Main Achievements
    7.2 Future Works
REFERENCES
發(fā)表論文和參加科研情況說明
ACKNOWLEDGEMENTS



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