臺灣博碩士論文加值系統

多年來，人類一直在尋找最佳利用周圍材料的方法，人們發明了許多具有獨特特性的不同結構。蜂窩結構之所以重要，是因為它們的重量輕，並且在增強機械性能方面具有若干優勢。當蜂窩結構被壓縮時，它們會發生顯著變形，並在相對恆定的應力下通過大量變形有效地耗散大量能量。由於其突出的特性，蜂窩結構已在廣泛的應用中得到應用，包括汽車、航空航天、體育、海洋和醫療行業。研究人員已經多次嘗試通過修改其幾何特徵或引入新結構來改善現有結構的機械性能。近年來，拉脹結構是一種新型的超材料，其幾何設計表現出負泊鬆比 (NPR) 行為。拉脹結構在受拉力時會橫向膨脹，在受壓時橫向收縮此外，拉脹結構因其獨特的機械性能、體積變化控制和卓越的衝擊能量吸收性能而對各種工程應用具有吸引力。這種結構的拉脹行為使它們能夠在廣泛的實際應用中發揮作用，包括夾芯板芯、醫用支架、智能過濾器、吸音器、減振器、紡織品、座墊和個人防護設備。
本研究的目的是設計一種具有前景的拉脹結構，可用於各種應用，同時滿足更高的工程標準。在這項工作中，通過結合兩種常見的拉脹蜂窩，可重入和抗四手性蜂窩的拓撲特性，開發了一種新的拉脹結構。這種新結構稱為抗四手性可重入拉脹劑（ARA）。樣品使用 Solidworks 設計，並使用具有特定尺寸的 PLA 材料利用3D打印技術製造，3D 打印樣品用於比較凹入拉脹蜂窩和 ARA 結構的平面內單軸壓縮和拉伸行為。當沿 X 和 Y 方向壓縮或拉伸時，觀察到這些結構是均勻的。對它們的變形、強度和泊鬆比進行了研究和討論。此外，使用 ANSYS 軟件進行有限元分析，並通過相應的實驗結果進行驗證。結果表明，數值模擬與實驗數據吻合良好。

Humans have always been looking for ways to make optimal use of surrounding materials, and over the years, have invented many different structures with unique properties. Cellular structures are significant because of their lightweight and several advantages in terms of enhanced mechanical properties. When cellular structures are compressed, they undergo significant deformation and efficiently dissipate a huge quantity of energy through massive deformation under relatively constant stress. Cellular structures have been employed in a wide range of applications, including the automotive, aerospace, sports, marine, and medical industries, due to their outstanding characteristics. Researchers have made several attempts to improve the mechanical performance of existing structures by modifying their geometric characteristics or by introducing new structures. Recently, auxetic structures are a novel type of metamaterial with a geometric design that exhibits negative Poisson's ratio (NPR) behavior. Auxetic structures expand laterally in tension and contract laterally in compression. Additionally, auxetic structures are attractive for various engineering applications because of their unique mechanical properties, volume change control, and superior impact energy absorption performance. The auxetic behavior of such structures enables them to perform in a broad variety of practical applications, including sandwich panel cores, medical stents, smart filters, sound absorbers, vibration dampers, textiles, seat cushions, and personal protective equipment.
The purpose of this study was to design an auxetic structure with promising features that might be employed in a variety of applications while meeting higher engineering criteria. A novel auxetic structure was developed in this work by combining the topological properties of two common auxetic honeycombs, re-entrant and anti-tetrachiral honeycombs. The new structure is called anti-chiral re-entrant auxetic (ARA). Specimens are designed using Solidworks and fabricated using the additive manufacturing method (3D printing) from PLA material with specific dimensions. 3D printed samples were used to compare the in-plane uniaxial compression and tensile behavior of re-entrant auxetic honeycomb and ARA structures. These structures were observed to be uniform when compressed or tensioned along the X and Y directions. Their deformation, strength, and Poisson’s ratio were studied and discussed. Moreover, finite element analyses were performed using ANSYS software and confirmed by the corresponding experimental results. The results show that there was a good agreement between numerical simulations and experimental data.

摘要................................................................... i
Abstract............................................................... iii
Acknowledgments........................................................ v
Contents............................................................... vi
List of Tables......................................................... ix
List of Figures........................................................ x
Symbol Description..................................................... xv
Chapter 1 Introduction................................................. 1
1.1 General............................................................ 1
1.2 Auxetic cellular structures........................................ 2
1.3 Research purpose................................................... 5
1.4 Research aim and objectives........................................ 6
Chapter 2 Literature review............................................ 7
2.1 Auxetic structures................................................. 7
2.2 Properties of auxetic structures................................... 8
2.2.1 Shear and bulk modulus........................................... 8
2.2.2 Indentation resistance........................................... 9
2.2.3 Fracture toughness............................................... 9
2.2.4 Fatigue properties............................................... 9
2.2.5 Energy absorption................................................ 9
2.2.6 Curvature shape.................................................. 10
2.2.7 Permeability..................................................... 10
2.3 Potential applications............................................. 11
2.3.1 Medical applications............................................. 11
2.3.2 Sport applications............................................... 13
2.3.3 Textiles......................................................... 14
2.3.4 Sensing and actuating devices.................................... 16
2.3.5 Energy absorption................................................ 17
Chapter 3 Theoretical Framework........................................ 19
3.1 Additive Manufacturing (AM)........................................ 19
3.2 Key mechanical performance indicators.............................. 20
3.2.1 Stress and Strain................................................ 20
3.2.2 Stress – strain diagrams......................................... 21
3.2.3 Material characteristics......................................... 23
3.2.4 Poisson’s ratio.................................................. 23
3.3 Basic Principles of Finite Element Method.......................... 25
Chapter 4 Research Methodology......................................... 27
4.1 Workflow........................................................... 27
4.2 Software Introduction.............................................. 28
4.2.1 Solidworks 2016.................................................. 28
4.2.2 Ansys Workbench 2020 R2.......................................... 29
4.2.3 Ultimaker Cura 4.8.0............................................. 29
4.3 Equipment Introduction............................................. 30
4.3.1 Fused deposition AM machine...................................... 30
4.3.2 PLA material for AM process...................................... 31
4.3.3 Universal Testing Machine (UTM).................................. 32
Chapter 5 Design, Experiments and Simulations.......................... 33
5.1 Development of a new auxetic structure............................. 33
5.2 Design of specimens................................................ 34
5.2.1 Specimens for compression test................................... 34
5.2.2 Specimens for tensile test....................................... 35
5.2.3 Manufacturing process............................................ 36
5.3 Experimental test.................................................. 38
5.3.1 Material characterization........................................ 38
5.3.2 Compression test................................................. 40
5.3.3 Tensile test..................................................... 43
5.3.4 Poisson’s ratio.................................................. 46
5.4 Numerical simulation............................................... 48
5.4.1 Simulation of compression test................................... 48
5.4.2 Simulation of tension test....................................... 50
Chapter 6 Results and Discussion....................................... 51
6.1 Compression test................................................... 51
6.1.1 ARA specimen..................................................... 51
6.1.2 Re-entrant specimen.............................................. 54
6.2 Tensile test....................................................... 58
6.2.1 ARA specimen..................................................... 58
6.2.2 Re-entrant specimen.............................................. 61
6.3 Poisson’s ratio.................................................... 65
6.3.1 Compression test................................................. 65
6.3.2 Tensile test..................................................... 68
Chapter 7 Conclusions and Devlopment Direction......................... 72
7.1 Conclusions........................................................ 72
7.2 Development Direction.............................................. 73
References............................................................. 74
Extended Abstract...................................................... 81

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