臺灣博碩士論文加值系統

熱塑性複合材料由於使用壽命長，高強度，耐衝擊性佳，加工過程容易等優點，因而有漸漸取代熱固性複合材料的趨勢，諸如在航空業、運動器材業和汽車工業上皆有許多熱塑性複合材料之零組件出現
。熱塑性複合材料機械性質會受環境溫度、溼度而影響。因此如要適當地設計熱塑性複合材料的零組件，則必須對其長期性質，如潛變響應做一詳細的了解。
在實用工程設計中，複合材料結構的可靠性評估，撓度和應力的分佈是很重要的準則。在負荷作用下，因為潛變可能會逐漸減少結構的剛性和導致不能被接受的大變形，所以潛在的長期黏彈或潛變行為必須被考慮的。本文中，探討碳纖維/尼龍六複合材料承受拉伸負荷下的黏彈行為。在潛變的試驗下，從單向性疊層板的實驗數據，建立了潛變順服並用冪次方程式來描述。和時間有關的潛變順服結合有限元素程式去預測疊層板在承受拉伸負荷下的黏彈行為。複合材料樑長期的撓曲潛變響應也一併探討。纖維角度排列和曡層順序在潛應變上的影響和樑的撓度及沿著樑厚度的應力分佈也將一併討論。

Thermoplastic matrix composites possess some advantages over
thermosetting matrix composites, such as long service life, higher toughness, higher impact resistance, improved process ability, and are now very commonplace in aircraft, sport, and automotive applications. Fiber reinforced thermoplastic composites were known to exhibit time-dependent creep behavior, which was magnified by environmental conditions such as temperature and humidity. If these materials are to be properly used in the design of critical structural components, the time-dependent creep responses must be characterized.
In practical engineering design, deflection and stress distributions are very important criteria in reliability evaluation of composite structures. The potential long term viscoelastic, or creep behavior under loading must be considered in design, because creep can lead to a gradual decrease of the structural effective stiffness and result in unacceptably large deformation. In the present investigation, the viscoelastic behavior of the carbon/nylon-6 composite material under uniform tension was performed. From the experimental data of unidirectional carbon/nylon-6 laminates under creep test, the creep compliance of the material was established and described as a power law. The time dependent creep compliance was incorporated into the finite element program to predict the viscoelastic behavior of laminated rods under uniform tension .The long term flexural creep responses of composite beams were also conducted. The influence of fiber orientation and ply lamination on the creep strains, beam deflections and bending stress distribution through the beam thickness was discussed.

摘要 I
ABSTRACT II
目錄 IV
表目錄 VII
圖目錄 VIII
第一章 緒論 1
1-1 前言 1
1-2 研究動機 1
1-3 文獻回顧 2
第二章 基本理論 5
2-1 線性黏彈行為 5
2-2 應力與潛應變之關係 7
2-3 冪次方程式 (Power-Law Equation) 11
2-4 疊層板理論 13
2-5 正交對稱疊層樑理論 15
第三章 材料機械性質與有限元素分析模型 16
3-1 有限元素分析模型 16
3-2 模型尺寸與材料機械性質 17
第四章 碳纖維/尼龍六熱塑性複合材料之黏彈行為 18
4-1 承受拉伸負荷之黏彈行為 18
4-2 承受彎矩之黏彈行為 20
第五章 結論與未來展望 23
参考文獻 26

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