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題 名 | 複合材料三明治殼構件最佳製程參數設計與製造=The Mechanical Behavior Study and Optimal Process Variables of Laminated Composite Foam-filled Sandwich Shells |
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作 者 | 賴峰民; | 書刊名 | 修平學報 |
卷 期 | 2 2001.03[民90.03] |
頁 次 | 頁161-172 |
分類號 | 440.34 |
關鍵詞 | 殼; 填充發泡材料; 三明治; 輕量化設計; 音洩系統; 首層破壞; Shell; Foam-filled; Sandwich; Minimum weight design; Acoustic emission AMS3 system; First-ply failure strength; AE; |
語 文 | 中文(Chinese) |
中文摘要 | 本文採用多層一階剪變形理論來推導殼的有限單元法,利用此方法進行分析及設計複合材料三明治殼構件。而本文所推導的分層一階剪變形理論之殼元素不僅考慮了側向的剪應變,同時亦考慮了側向的正向應變,因此本文所發展的有限單元法可精確地分析薄殼元素及適當的厚殼元素之力學行為及首層破壞載重。 最佳化理論乃採用一具束制條件的全域最佳化設計方法及結合branch and bound方法,並以兩階段的最佳化設計技巧來研究複合材料三明治殼構件於殼構件強度之限制條件下的輕量化設計,以尋找出最佳的連續的製程參數(纖維角度)及不連續的製程參數(層組厚度)。除此之外,本文利用實驗結果及理論分析方法來探討複合材料三明治殼構件受到不同載重時的首層破壞載重,而首層破壞實驗是利用音洩系統(AE system)來量測三明治殼構件的首層破壞載重,藉由實驗結果來驗證複合材料三明治殼構件之理論分析方法的精確性。 |
英文摘要 | The finite element formulation of a shell element based layerwise linear displacement theory are developed for the design and analysis of laminated composite foam-filled sandwich shells. This element takes into account transverse shear strains and normal strain. It also permits both thin and moderately thick shells to be included in a single solution scheme. The previously proposed constrained global optimization method is incorporated into the branch and bound method to formulate a two level optimization technique for conducting the minimum weight design of thick laminated composite foam-filled sandwich shells with continuous (core thickness) and discrete (number of layer) design variables subject to strength constraint. Besides, experimental and theoretical methods are presented to study the first-ply failure strength of laminated composite foam-filled sandwich shells under loading conditions. The first-ply failure loads are determined using the acoustic emission AMS3(AE) system. The test results are used to verify the accuracy of the analytical techniques. |
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