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研究生: 李哲豪
Lee, Che-Hao
論文名稱: 結構配置及孔隙率對蜂巢結構材料的力學影響
Influence of architecture and porosity on mechanical behavior of honeycomb structures
指導教授: 劉立偉
Liu, Li-Wei
學位類別: 碩士
Master
系所名稱: 工學院 - 工程科學系
Department of Engineering Science
論文出版年: 2020
畢業學年度: 108
語文別: 英文
論文頁數: 114
中文關鍵詞: 蜂巢結構結構配置孔隙率單軸實驗循環載重有限元素分析力-位移曲線遲滯迴圈應力場
外文關鍵詞: Honeycombs, architecture, porosity, monotonic experiment, cyclic loading, finite element analysis, load-displacement curve, hysteresis loop, stress field
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  • 本研究以實驗與計算的方式來探討在單調與循環載重下結構配置與孔隙率對於蜂巢結構材料的塑性行為之影響。藉由改變方向性與孔隙率,或者是固定孔隙率而改變蜂巢結構的配置,設計出4類17種不同的蜂巢結構材料。其中的1類3種蜂巢結構,以三維列印方式製出試體,施以單調拉伸路徑,觀察實驗位移-力曲線,並制定降伏力/位移決定準則。在獲得降伏力/位移與彈性勁度後,運用具備von Mises降伏面與Prager線性走動硬化的彈塑性材料模式,以此基礎來建立有限元素分析模型,使用ANSYS來模擬單軸拉伸試驗,並且觀察了4種類別的蜂巢結構的整體力與位移的行為還有局部的應力場變化。此外,也模擬了循環加載,發現在位移控制±2mm以及力量控制±800N的循環加載下,遲滯迴圈的面積、迴圈端點間的斜率以及最高載重的值會隨著結構配置以及孔隙率的改變而產生變化。

    In this study, the influence of architecture and porosity on the plastic behaviorof honeycombs structural materials under monotonic and cyclic loading was explored experimentally and computationally. By changing the orientation and porosity, or changing the configuration of the honeycombs by fixing the porosity, 4 categories with 17 types honeycombs were designed. Among these specimens, one category with three types honeycombs were manufactured by 3D printing and the applied monotonic displacement path to experimentally observe the displacement-force curves. We further defined the determination of the yield load/displacement to obtain the yielding load/displacement and the elastic stiffness. Then the elastic-plastic material model with von Mises yield surface and Prager's kinematic hardening rule were used in the finite element analysis. We conducted ANSYS to simulate uniaxial tensile tests of the 4 categories of honeycombs and then observed the global behavior of load and displacementand the local detail of the stress field. Furthermore, the cyclic loading tests with the displacement-controlled (±2mm) and the force-controlled (±800N) were simulated and the influence of the orientation, the porosity, and the architecture on the area of hysteresis loop, slope of the endpoints and peak load were explored from simulation.

    摘要 I Abstract II 致謝 III List of Figures VII List of Tables XVI Chapter 1 Introduction 1 1.1 Background 1 1.1.1 Mechanical behavior of honeycombs under monotonic loading 2 1.1.2 Mechanical behavior of honeycombs under biaxial loading 3 1.1.3 Hierarchical structures and energy absorption 3 1.1.4 Plastic behavior of materials under cyclic test 4 1.2 Objective 5 1.3 Outlines 6 Chapter 2 Experimental study on influence of porosity 7 2.1 Specimen design 8 2.2 The manufacture of honeycomb specimen 8 2.2.1 Layer height 9 2.2.2 Initial layer height 10 2.2.3 Line width 10 2.2.4 Infill density 10 2.3 Tensile tests of honeycombs 11 2.3.1 Experiment methods 11 2.3.2 Experimental results 11 2.4 Determination of yield loads 12 2.5 Influence of porosity on yield loads & elastic stiffness 13 Chapter 3 Computational study of influence of porosity and architecture 26 3.1 Specimen design 26 3.2 Finite element modelling 27 3.2.1 Constitutive modelling 28 3.2.2 Convergence analysis 29 3.2.3 Validation of finite element models 30 3.3 Computational simulation and results 33 3.3.1 Displacement-controlled 33 3.3.2 Force-controlled 33 3.4 Comparison & discussions 34 3.4.1 Area of hysteresis loop (displacement-controlled) 34 3.4.2 Peak load (displacement-controlled) 34 3.4.3 Slope of the endpoints (displacement-controlled) 35 3.4.4 Area of hysteresis loop (force-controlled) 35 3.4.5 Peak displacement (force-controlled) 36 3.4.6 Slope of the endpoints (force-controlled) 36 Chapter 4 Conclusion 109 Reference 111 Appendix 114

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