本論文提出三種MSPT (Membrane-Stiffened Sandwich Panel Technology) 結構藉縫合技術而實現與隔框一體成型、無開孔之完全疊層結構的設計構想，藉此可免除Boeing與NASA所硏發之PRSEUS (Pultruded Rod Stitched Efficient Unitized Structure) 結構中開孔所引起的強度問題，與裝置預固化棒的製程問題。其中MSPT係利用在三明治結構中加入曲面薄層設計，例如加入曲面複材疊層。利用ABAQUS有限元素分析軟體建立各設計構想和PRSEUS模型，施予結構壓力、隔框方向與縱樑方向負載。透過線性挫曲分析、非線性分析、複材脫層非線性分析，比較各結構在完整如初與複材疊層和發泡芯材間發生嚴重脫膠的情況下，結構行為上的差異。就線性挫曲分析結果而言，各構型在隔框方向強度都優於PRSEUS許多，在縱樑方向強度也皆優於PRSEUS。以非線性分析而言，構型一、二在抗壓力的剛性表現上勝於PRSEUS。於縱樑方向負載到達到各構型線性挫曲值之前，變形已有非線性現象產生，但PRSEUS的變形在負載到達此之前幾乎全然線性。然而非線性分析結果並未顯示任何不穩定的挫曲現象。最大與最小主應變數值方面，各構型皆明顯遜於PRSEUS。且當有嚴重脫膠發生時，此三設計樣的損毀容忍度皆應屬不足。若結構設計重點在於壓力和隔框方向剛性與強度，縱樑方向損毀容忍度非關鍵時，構型一為可能方案。但如需考量到損毀容忍度，則構型二較有可能勝任。例如：構型一和二可能適用於一體成型大面積輕量之運輸機地板。

This thesis addresses three MSPT (Membrane-Stiffened Panel Technology) structural designs, in which fiber-reinforced composite sandwich panels and frames can be integrally fabricated using the stitching technique. The MSPT essentially utilizes various sandwich constructions where there is a reinforcing curved thin shell, e.g., curved composite laminate. The three MSPT designs were carried out meticulously so that they have the same weight as a PRSEUS (Pultruded Rod Stitched Efficient Unitized Structure) panel developed by Boeing and NASA. The finite element analysis software ABAQUS was used for linear buckling analyses and nonlinear analyses of the PRSEUS panel and three pristine MSPT designs. Each MSPT design with severe disbonding between composite laminates and foam cores of sandwich construction was also numerically investigated. The results of the linear buckling analyses indicate that the MSPT designs are overwhelmingly stronger than the PRSEUS in the frame direction, and also excel in the stringer direction. In the nonlinear analyses, MSPT designs I and II excel PRSEUS in stiffness against pressure loading. All the MSPT designs show nonlinear deflection responses to the loading in the stringer direction before the applied loads reach the respective linear buckling strengths, although all the deflections are stable. In contrast, the PRSEUS behaves linearly before the applied load reaches the linear buckling strength. From the computed maximum and minimum principal strains, it can be inferred that PRSEUS has higher ultimate strengths than any MSPT design. In the presence of severe disbonds, none of the MSPT designs has adequate residual strength. Therefore, designs I and II may be suitable design candidates if the structural design is driven by stiffness or strength against pressure loading or loading in the frame direction, and if damage tolerance is not a concern. Design II is the best choice from the three if there is a minor damage tolerance concern. For example, designs I and II may be suitable for integrally fabricated large lightweight floors for air transports.

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