本文乃設計採用三維纖維織物係將兩層同時編織之平織布加上同步上下聯接之垂直纖維所構成，然後含浸樹脂成為改良式三明治結構複材。此一結構複材具有以下之優點：(一) 可使 FRP 製造業者改進相關產品，如低重量、高剛性及高強度；(二) 由於使用較少之樹酯及垂直纖維之毛細管作用，故具有較低材料成本及降低人工費用之效應；較傳統式三明治結構複材之內部心材更易加工及可塑性；(三) 其內部中空結構可作為防漏檢測、冷卻及隔熱等功能。以期改善傳統式三明治結構複材實際應用於構材時，會因外在載重而造成面板的張力破壞或皺摺破壞、心材的剪力破壞、面材與心材間的脫層破壞等現象之缺點。為發展一強度高、韌度佳之改良式三明治結構複材，乃需對其製程與力學性質充分瞭解，所以本文特著眼於此，故研究內容包含：(一) 如何製造三維纖維織物作為改良式三明治結構複材；(二) 經由理論的分析及實驗的量測來瞭解此一材料之力學特性。研究之結果將可用於三維纖維織物產品的開發與性能評估，且可對改良式三明治結構複材選用及力學性提供設計依據。

In effort to overcome the drawbacks of traditional sandwich such as wrinkling failure, shear failure in core materials, and delamination, this paper proposes to make a specially modified fabrics as sandwich composites. Such a modified fabric is made up of two bi-directional woven fabrics separated by vertical fibers as integrated sandwich composites. The resulting sandwich composites have the following advantages: high bending stiffness, high strength, no delamination or stress cracking, easy handling of large parts and good formability at a low weight compared with other core materials like honeycombs and foams. In addition, the hollow structure enables the modified fabrics to use as leak detection, cooling, insulated, and noise control materials. In an effort to take full advantages of sandwich composites, a thorough understanding of their fabrication and characterization is necessary. To this end, the research topics include (a) fabrication of modified fabrics as a sandwich composite, and (b) characterization of the material effective properties of the composite through theoretical analysis and experimental measurement. It is believed that this research will offer valuable results for composite designer to tailor the end products and for the related industries in the material fabrication.