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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 劉立偉 | zh_TW |
| dc.contributor.advisor | Li-Wei Liu | en |
| dc.contributor.author | 洪鈺豪 | zh_TW |
| dc.contributor.author | Yuh-Hao Hung | en |
| dc.date.accessioned | 2025-08-20T16:17:35Z | - |
| dc.date.available | 2025-08-21 | - |
| dc.date.copyright | 2025-08-20 | - |
| dc.date.issued | 2025 | - |
| dc.date.submitted | 2025-08-14 | - |
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Band gaps for wave propagation in 2-d periodic three-phase composites with coated star-shaped inclusions and an orthotropic matrix. Composites Part B: Engineering, 182:107319, 2020. [31] Z. Zhu, Z. Deng, and J. Du. Elastic Wave Propagation in Hierarchical Honeycombs With Woodpile-Like Vertexes. Journal of Vibration and Acoustics, 2019. | - |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/98921 | - |
| dc.description.abstract | 本研究針對六角與三角蜂巢結構，建立彈性動態模型與頻率帶隙模型。彈性動態模型基於固體力學的四級理論架構，納入材料組成律、變形機制與幾何特性，並考慮尺寸效應；頻率帶隙模型則透過傳遞矩陣法與Bloch理論建構，用以識別特定頻率範圍內的帶隙區域。此外，亦進行參數化分析，探討相對密度、傾角與牆厚等幾何參數對動態響應與帶隙行為的影響。為佐證理論模型，本研究亦自製哈金森衝擊桿測試儀，並以3D列印製作試體，實際觀察不同微結構配置下之波傳行為。透過理論與實驗結合之方式，建立了一套分析蜂巢材料動態行為的完整架構，可作為未來設計高強度、高韌性與具消能潛力之蜂巢結構材料的基礎。 | zh_TW |
| dc.description.abstract | This study develops elastodynamic models and frequency bandgap models for hexagonal and triangular honeycomb structures. The elastodynamic model is constructed based on a four-level solid mechanics framework, incorporating constitutive behavior, deformation mechanisms, and geometric features, while accounting for size effects. The frequency bandgap model is formulated using the transfer matrix method and Bloch's theorem to identify the bandgap regions across a specified frequency range. Parametric studies are conducted to evaluate the effects of microstructural parameters, such as relative density, inclined angle, and wall thickness, on the dynamic response and bandgap characteristics. To support the theoretical analysis, a Hopkinson bar apparatus is constructed, and 3D-printed specimens are prepared to experimentally investigate wave propagation in cellular structures with various geometries. This integrated modeling and testing framework provides a foundation for designing lightweight, high-strength, and energy-dissipative cellular materials. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2025-08-20T16:17:35Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2025-08-20T16:17:35Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | Acknowledgements i
摘要iii Abstract v Contents vii List of Figures xi List of Tables xvii Notations and Conventions xxi Chapter 1 Literature review 1 1.1 Mechanics of cellular materials . . . . . . . . . . . . . . . . . . . . 1 1.2 Theoretical studies of strain gradient and couple stress . . . . . . . . 2 1.3 Experimental studies of size-dependent behavior in cellular materials 4 1.4 Wave propagation and frequency bandgaps . . . . . . . . . . . . . . 5 Chapter 2 Elastodynamic Model of Hexagonal Honeycombs 7 2.1 Hexagonal Honeycombs . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Decoupling of biaxial stress inputs applied to hexagonal honeycombs 9 2.3 Hierarchical modeling of hexagonal honeycombs . . . . . . . . . . . 9 2.3.1 Material point level . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.3.2 Cross section level . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3.3 Cell wall level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3.4 Cellular material level . . . . . . . . . . . . . . . . . . . . . . . . . 21 2.4 Influence factors . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2.5 Dynamic responses under cyclic stress inputs . . . . . . . . . . . . . 26 2.5.1 Scenario I: influence of the relative density . . . . . . . . . . . . . 29 2.5.2 Scenario II: influence of the thickness . . . . . . . . . . . . . . . . 32 2.5.3 Scenario III: influence of the inclined angle . . . . . . . . . . . . . 35 Chapter 3 Elastodynamic model of triangular honeycombs 41 3.1 Triangular honeycombs . . . . . . . . . . . . . . . . . . . . . . . . . 41 3.2 Decoupled stress states of triangular honeycombs . . . . . . . . . . . 43 3.3 Hierarchical modeling of triangular honeycombs . . . . . . . . . . . 43 3.3.1 Material point level . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3.3.2 Cross section level . . . . . . . . . . . . . . . . . . . . . . . . . . 44 3.3.3 Cell wall level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 3.3.4 Cellular material level . . . . . . . . . . . . . . . . . . . . . . . . . 52 3.4 Responses under cyclic stress inputs . . . . . . . . . . . . . . . . . . 53 3.4.1 Scenario I: influence of the relative density . . . . . . . . . . . . . 56 3.4.2 Scenario II: influence of the inclined angle . . . . . . . . . . . . . . 57 Chapter 4 Dispersion analysis of cellular mateials 61 4.1 Frequency bandgap model of hexagonal honeycombs . . . . . . . . . 61 4.2 Investigation on the influence of microstructures of hexagonal honeycombs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 4.2.1 Scenario I: influence of the relative density . . . . . . . . . . . . . 67 4.2.2 Scenario II: influence of the thickness . . . . . . . . . . . . . . . . 69 4.2.3 Scenario III: influence of the inclined angle . . . . . . . . . . . . . 70 4.3 Frequency bandgap model of triangular honeycombs . . . . . . . . . 72 4.4 Investigation on the influence of microstructures of triangular honeycombs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.4.1 Scenario I: influence of the relative density . . . . . . . . . . . . . 77 4.4.2 Scenario II: influence of the inclined angle . . . . . . . . . . . . . . 79 Chapter 5 Experimental studies of cellular materials 81 5.1 Hopkinson bar testing machine . . . . . . . . . . . . . . . . . . . . . 81 5.2 Experimental setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 5.3 Experimental results . . . . . . . . . . . . . . . . . . . . . . . . . . 84 Chapter 6 Conclusions and future works 91 6.1 Comparative conclusions of microstructural influences on dynamic responses in hexagonal and triangular honeycombs . . . . . . . . . . 91 6.2 Comparative conclusions of microstructural influences on frequency bandgaps in hexagonal and triangular honeycombs . . . . . . . . . . 92 6.3 Future works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 References 95 | - |
| dc.language.iso | en | - |
| dc.subject | 頻率帶隙模型 | zh_TW |
| dc.subject | 彈性動態模型 | zh_TW |
| dc.subject | 自製哈金森衝擊桿測試儀 | zh_TW |
| dc.subject | 微結構 | zh_TW |
| dc.subject | Elastodynamic model | en |
| dc.subject | Microstructural architecture | en |
| dc.subject | Frequency bandgap model | en |
| dc.subject | Self-made Hopkinson bar testing machine | en |
| dc.title | 孔隙材料頻散特性之探討 | zh_TW |
| dc.title | Investigation on dispersion of cellular materials | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 113-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 陳正宗;郭茂坤;張為光 | zh_TW |
| dc.contributor.oralexamcommittee | Jeng-Tzong Chen;Mao-Kuen Kuo;Wei-Kuang Chang | en |
| dc.subject.keyword | 彈性動態模型,頻率帶隙模型,微結構,自製哈金森衝擊桿測試儀, | zh_TW |
| dc.subject.keyword | Elastodynamic model,Frequency bandgap model,Microstructural architecture,Self-made Hopkinson bar testing machine, | en |
| dc.relation.page | 99 | - |
| dc.identifier.doi | 10.6342/NTU202504275 | - |
| dc.rights.note | 未授權 | - |
| dc.date.accepted | 2025-08-15 | - |
| dc.contributor.author-college | 工學院 | - |
| dc.contributor.author-dept | 土木工程學系 | - |
| dc.date.embargo-lift | N/A | - |
| 顯示於系所單位： | 土木工程學系 | |
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