本研究主要探討竹纖維蓆經真空預型以及VARTM製程於轉角處的成形變化。第一部分以不同的預型方式探討彎曲竹纖維蓆之成形特性。結果表明，凸模預型使用鉛片做為均佈壓力用層板(caul plate)可降低角度偏差量，且不論何種預型方式，成品之曲率半徑皆與模具之設計無明顯偏差；在凹模中，使用到鉛片的所有製程都可使預型的角度低於模具設計的角度，且使用鉛片加鋁棒的預型可以獲得最接近模具設計的曲率半徑。第二部分研究預型的品質對複合材料成型的影響。結果表明，隨著預型曲率半徑的偏差量提升，複合材料之厚度偏差率以及角度偏差率也會隨之提升。第三部分則探討竹纖維蓆疊層數對於複合材料製造的影響。疊層數的提升可以幫助複合材料的厚度以及角度變異減小，但凹模雙層結構的上層纖維相較於下層纖維更容易有纖維損傷影響複合材料結構。第四階段則討論不同纖維方向對複合材料製造的影響。在單層方面，0º比 90º纖維方向之複合材料與模具有較佳的貼合性，但受到聚酯纖維線的影響，使複合材料的平板處有較大的平均厚度；在雙層方面，90º/0º疊層相較於 90º/90º疊層有較佳的複合材料成形角度，但無法減少轉角處複合材料的厚度偏差。

The purpose of this study is to understand the process of vacuum preforming of bamboo fiber mat and use the preform to fabricate composites by vacuum assisted resin transfer molding. In vacuum preforming process, employment of the lead caul plate and aluminum rod can reduce the deviation of the corner radius of the preform. The smaller the difference of corner radius between preforms and the mold design is, the lower the thickness and angle deviations of composites become. Raising the preform temperature can reduce the deviation of the corner radius, resulting in a composite with more precise dimensions. Furthermore, increasing the number of layers of bamboo fiber mats can also reduce thickness and angle deviations of the composite. Bamboo fiber mat with fibers oriented at 0° exhibits better conformity with the mold during preforming as compared to 90°. In comparison, 90°/0° laminate layers have better formability than 90°/90° laminate layers.

[1] Z. Chen, X. Liu, H. Chen, J. Li, X. Wang, and J. Zhu, "Application of epoxy resin in cultural relics protection," Chinese Chemical Letters, p. 109194, 2023.
[2] C. M. Albert and K. C. Liew, "Recent development and challenges in enhancing fire performance on wood and wood-based composites: A 10-year review from 2012 to 2021," Journal of Bioresources and Bioproducts, 2023.
[3] T. Bai et al., "Wetting mechanism and interfacial bonding performance of bamboo fiber reinforced epoxy resin composites," Composites Science and Technology, vol. 213, p. 108951, 2021.
[4] J. Hao, J. Bardon, G. Mertz, C. Rojas, and A. W. Van Vuure, "Effect of plasma treatment on hygrothermal creep behaviour of flax fibre composite," Composites Part A: Applied Science and Manufacturing, p. 108322, 2024.
[5] M. Liu et al., "Cotton fiber-based composite aerogel derived from waste biomass for high-performance solar-driven interfacial evaporation," Industrial Crops and Products, vol. 211, p. 118220, 2024.
[6] S. Hashmi, I. A. Choudhury, Ed. Encyclopedia of Renewable and Sustainable Materials. New York: Elsevier, 2020.
[7] F. Albermani, G. Goh, and S. L. Chan, "Lightweight bamboo double layer grid system," Engineering structures, vol. 29, no. 7, pp. 1499-1506, 2007.
[8] B. Yang, Bamboo and Bamboo Architecture. Kumming: Yunnan People’s Publishing House, 2014.
[9] S. C. Chin, K. F. Tee, F. S. Tong, H. R. Ong, and J. Gimbun, "Thermal and mechanical properties of bamboo fiber reinforced composites," Materials Today Communications, vol. 23, p. 100876, 2020.
[10] P. Liu, Q. Zhou, N. Jiang, H. Zhang, and J. Tian, "Fundamental research on tensile properties of phyllostachys bamboo," Results in Materials, vol. 7, p. 100076, 2020.
[11] Q. Chen et al., "Real-time flexural fracture behaviors and toughening mechanisms of bamboo slivers with different fiber content and moisture content," Engineering Fracture Mechanics, vol. 288, p. 109244, 2023.
[12] N. Jiyas, I. Sasidharan, and K. B. Kumar, "Tensile properties and morphological insights into chemically modified fibres of Pseudoxytenanthera bamboo species as sustainable reinforcements in composites," Advances in Bamboo Science, vol. 5, p. 100050, 2023.
[13] J. Kaima, I. Preechawuttipong, R. Peyroux, P. Jongchansitto, and T. Kaima, "Experimental investigation of alkaline treatment processes (NaOH, KOH and ash) on tensile strength of the bamboo fiber bundle," Results in Engineering, vol. 18, p. 101186, 2023.
[14] M. G. S. Ribeiro, I. P. Miranda, W. M. Kriven, A. Ozer, and R. A. S. Ribeiro, "High strength and low water absorption of bamboo fiber-reinforced geopolymer composites," Construction and Building Materials, vol. 411, p. 134179, 2024.
[15] Q. Lin et al., "Advanced functional materials based on bamboo cellulose fibers with different crystal structures," Composites Part A: Applied Science and Manufacturing, vol. 154, p. 106758, 2022.
[16] P. O. Awoyera, A. Akin-Adeniyi, A. Bahrami, and L. M. B. Romero, "Structural performance of fire-damaged concrete beams retrofitted using bamboo fiber laminates," Results in Engineering, vol. 21, p. 101821, 2024.
[17] S. M. Belal, M. S. Anwar, M. S. Islam, M. Arifuzzaman, and M. A. Al Bari, "Numerical study on the design of flax/bamboo fiber reinforced hybrid composites under bending load," Hybrid Advances, vol. 4, p. 100112, 2023.
[18] G. S. Rao, K. Debnath, and R. Mahapatra, "Recycling and degradation behaviour of the bamboo fibre reinforced green composite fabricated by injection moulding," Sustainable Materials and Technologies, p. e00865, 2024.
[19] K. Aruchamy, S. P. Subramani, S. K. Palaniappan, B. Sethuraman, and G. V. Kaliyannan, "Study on mechanical characteristics of woven cotton/bamboo hybrid reinforced composite laminates," Journal of Materials Research and Technology, vol. 9, no. 1, pp. 718-726, 2020.
[20] H. Kim, K. Okubo, T. Fujii, and K. Takemura, "Influence of fiber extraction and surface modification on mechanical properties of green composites with bamboo fiber," Journal of Adhesion Science and Technology, vol. 27, no. 12, pp. 1348-1358, 2013.
[21] 許家泓, "竹纖維/聚酯纖維編織預型與複合材料之研究," 碩士, 航空太空工程學系, 國立成功大學, 臺南市, 2023.
[22] L. Gao, W. Guo, and S. Luo, "Investigation of changes in compressed moso bamboo (Phyllostachys pubescens) after hot-press molding," Journal of wood science, vol. 64, pp. 557-565, 2018.
[23] R. Hao and W. Liu, "竹片弯曲加工工艺技术探讨," 家具与室内装饰, no. 4, pp. 28-29, 2014.
[24] H.-H. Chiu and W.-B. Young, "Characteristic study of bamboo fibers in preforming," Journal of Composite Materials, vol. 54, no. 25, pp. 3871-3882, 2020.
[25] B.-J. Wang and W.-B. Young, "The natural fiber reinforced thermoplastic composite made of woven bamboo fiber and polypropylene," Fibers and Polymers, vol. 23, no. 1, pp. 155-163, 2022.
[26] A. Levy and P. Hubert, "Vacuum-bagged composite laminate forming processes: Predicting thickness deviation in complex shapes," Composites Part A: Applied Science and Manufacturing, vol. 126, p. 105568, 2019.
[27] M. Brillant and P. Hubert, "Modelling and characterization of thickness variations in L-shape out-of-autoclave laminates," in 18th International Conference on Composites Materials, Jeju, South Korea, 2011.
[28] Y. Ma, T. Centea, and S. R. Nutt, "Defect reduction strategies for the manufacture of contoured laminates using vacuum BAG‐only prepregs," Polymer composites, vol. 38, no. 9, pp. 2016-2025, 2017.
[29] K.-J. Wu and W.-B. Young, "Fabrication and quality analysis of angle composite part by vacuum-bag-only process with interleaved woven fiber/prepreg layup," The International Journal of Advanced Manufacturing Technology, vol. 122, no. 7, pp. 3281-3297, 2022.
[30] K.-J. Wu and W.-B. Young, "Complex angle part fabricated by vacuum bag only process with interleaved dry fiber and prepreg," Journal of Composite Materials, vol. 57, no. 2, pp. 199-211, 2023.
[31] 呂錦明, 台灣竹圖鑑. 晨星出版社, 2010.
[32] 黃千桓. "桂竹." 自然谷環境信託基地. https://teia.tw/archives/natural_valley_star/ph2016-04-02 (accessed 2016).
[33] C. Lian et al., "Ultrastructure of parenchyma cell wall in bamboo (Phyllostachys edulis) culms," Cellulose, vol. 27, no. 13, pp. 7321-7329, 2020.
[34] X. Wang et al., "Investigation of the microstructure, chemical structure, and bonding interfacial properties of thermal-treated bamboo," International Journal of Adhesion and Adhesives, vol. 125, p. 103400, 2023.
[35] Q. Lin, Y. Huang, and W. Yu, "An in-depth study of molecular and supramolecular structures of bamboo cellulose upon heat treatment," Carbohydrate polymers, vol. 241, p. 116412, 2020.
[36] D. Kumar and P. Mohanraj, "Review on natural fiber in various pretreatment conditions for preparing perfect fiber," Asian Journal of Applied Science and Technology (AJAST), vol. 1, no. 2, pp. 66-78, 2017.
[37] H. Chen et al., "Effect of alkali treatment on microstructure and mechanical properties of individual bamboo fibers," Cellulose, vol. 24, pp. 333-347, 2017.
[38] T. M. Joseph et al., "Polyethylene terephthalate (PET) recycling: A review," Case Studies in Chemical and Environmental Engineering, p. 100673, 2024.
[39] E. I. M. Bardoquillo, J. M. B. Firman, D. B. Montecastro, and A. M. Basilio, "Chemical recycling of waste polyethylene terephthalate (PET) bottles via recovery and polymerization of terephthalic acid (TPA) and ethylene glycol (EG)," Materials Today: Proceedings, 2023.
[40] Y. Liu et al., "Recyclable epoxy resins with different silyl ether structures: structure–property relationships and applications in diverse functional composites," Composites Part A: Applied Science and Manufacturing, vol. 179, p. 108017, 2024.
[41] M. Grujicic, K. Chittajallu, and S. Walsh, "Non-isothermal preform infiltration during the vacuum-assisted resin transfer molding (VARTM) process," Applied surface science, vol. 245, no. 1-4, pp. 51-64, 2005.
[42] L. A. Khan, A. Kausar, and R. J. Day, "Aerospace composite cured by quickstep and autoclave processing techniques: Evaluation and comparison of reaction progress," Aerospace Science and Technology, vol. 65, pp. 100-105, 2017.
[43] L. Moretti, T. Lavaggi, P. Simacek, and S. G. Advani, "Behavior of perforated flexible impermeable interlayers during VARTM processes," Composites Part A: Applied Science and Manufacturing, vol. 173, p. 107691, 2023.
[44] A. Goren and C. Atas, "Manufacturing of polymer matrix composites using vacuum assisted resin infusion molding," Archives of materials Science and Engineering, vol. 34, no. 2, pp. 117-120, 2008.
[45] V. R. Tamakuwala, "Manufacturing of fiber reinforced polymer by using VARTM process: A review," Materials Today: Proceedings, vol. 44, pp. 987-993, 2021.
[46] M. A. Yalcinkaya, E. M. Sozer, and M. C. Altan, "Fabrication of high quality composite laminates by pressurized and heated-VARTM," Composites Part A: Applied Science and Manufacturing, vol. 102, pp. 336-346, 2017.
[47] A. de Sá et al., "Influence of the outer skin on the flexural properties and thermal conductivity of densified Dendrocalamus asper bamboo," Advances in Bamboo Science, vol. 5, p. 100041, 2023.