三明治結構是一常見的複合材料結構，由上下面材與芯材構成。主要優點在於其高強度與高勁度；除此之外，也具備吸收能量、消音或是抗震、阻燃、抵抗衝擊等優良性能，其應用層面十分廣泛，如航空、造船、汽車、建築、國防等都有使用三明治結構的例子。三明治複合材料之表面材料通常選擇是金屬合金和纖維複合材料，主要原因在於其高強度和高境度的優勢。為了減輕整體結構的重量，核心材料多採用輕質材料如發泡高分子材料或蜂巢狀結構。本文所探討之三明治結構，表面材料為纖維強化複合材料，核心材料則為添加奈米碳管之高分子複材。
本文討論含脫層三明治結構在四點彎曲試驗下，觀察其彎曲行為及局部挫曲與脫層的現象；文中之三明治結構由兩種複合材料構成，面材為碳纖維疊層板，芯材採用多壁奈米碳管/環氧樹脂高分子材料，利用環氧樹脂為黏著劑接合。實驗方面，進行四點彎曲試驗，探討含脫層三明治結構挫曲與脫層相對應之負載值；文中將討論改變芯材碳管含量、疊層板疊層角度與未黏著區域長度對三明治結構彎曲行為及面材局部挫曲與脫層之影響，並進行有限單元模擬分析，與實驗結果相互驗證。

1.Pagano, N. J. and Pipes, R. B., “The Influence of Stacking Sequence on Laminate Strength,” Journal of Composite Materials, Vol. 5, pp.50-57, 1971
2.Muc, A., “Optimal Fiber Orientation for Simply-Supported, Angle-Ply Plate Under Biaxial Compression,” Composite Structures, Vol. 9, pp.161-172, 1988
3.Brillaur, J. and Mahi, A. E., “Numerical Simulation of the Influence of Stacking Sequence on Transverse Ply Cracking in Composite,” Composite Structures, Vol. 17, pp. 23-35, 1991
4.T. C. Truong, M. Vettori, S. Lomov and I. Verpoest, “Carbon Composites Based on Multi-axial Multi-ply Stitched Preforms. Part 4. Mechanical Properties of Composites and Damage Observation,” Composites:Part A, Vol. 36, pp. 1207–1221, 2005.
5.I. M. Daniel and J. L. Abot, “Fabrication, Testing and Analysis of Composite Sandwich Beams,” Composites Science and Technology, Vol. 60, pp. 2455-2463, 2000.
6.J. Kim and S. R. Swanson, “Design of Sandwich Structures for Concentrated Loading, Composite Structures,” Vol. 52, pp. 365-373, 2001.
7.F. Mujika, “On the Difference Between Flexural Moduli Obtained by Three-Point and Four-Point Bending Tests,” Polymer Testing, Vol. 25, pp. 214-220, 2006.
8.E. E. Gdoutos, I. M. Daniel, K. A. Wang and J. L. Abot, “Nonlinear Behavior of Composite Sandwich Beams in Three-Point Bending,” Experimental Mechanics, Vol. 41, pp. 182-189, 2001.
9.M. Styles, P. Compston and S. Kalyanasundaram, “The Effect of Core Thickness on The Fexural Behaviour of Aluminium Foam Sandwich Structures,” Composite Structures, Vol. 80, pp. 532-538, 2007.
10.N. Pokharel and M. Mahendran, “Experimental Investigation and Design of Sandwich Panels Subject to Local Buckling Effects,” Journal of Constructional Steel Research, Vol. 59, pp. 1533-11552, 2003.
11.F. Avilès and L. A. Carlsson , “Elastic Foundation Analysis of Local Face Buckling Indebonded Sandwich Columns,” Mechanics of Materials, Vol. 37, pp. 1026-1034, 2004.
12.K. Y. Volokh and A. Needleman, “ Buckling of Sandwich Beams with Compliant Interfaces,” Computers and Structures, Vol. 80, pp. 1329-1335, 2002.
13.A. L. Mouritz and R. S. Thomson, “Compression, Flexure and Shear Properties of A Sandwich Composite Containing Defects,” Composite Structures, Vol. 44, pp. 263-278, 1999.
14.Liangjin Gui, Zhengneng Li, “Delamination buckling of stitched laminates”, Composite Structures, Vol. 61, pp. 629-636, 2001.
15.J. Hohe and W. Becker, “Assessment of the Delamination Hazard of the Core Face Sheet Bond in Structural Sandwich Panels,” International Journal of Fracture, Vol. 109, pp. 413-432, 2001.
16.S. J. Huang., “ Mathematical modeling of the stress-strain state of adhesive layer in sandwich structure, ” Journal Mechanics of Composite Materials, Vol. 38, No. 2, pp. 103-120, 2002.
17.Chai, H., Babcock, C. D. and Knauss, W. G., “One Dimensional Modeling of Failure in Laminated Plates by Delamination Buckling, ” International Journal of Solids and Structures, Vol. 17, pp.1069-1083, 1983
18.V. Vadakke and L. A. Carlsson, “Experimental Investigation of Compression Failure of Sandwich Specimens with Face/Core Debond,” Composites:Part B, Vol. 35, pp. 583-590, 2004.
19.蕭銘志，三明治板的挫曲分析-五層理論法，國立中正大學機械工程研究所碩士論文，2005。
20.H. Mahfuz, S. Islam, M Saha, L. Carlsson and S. Jeelani, “Buckling of Sandwich Composites Effects of Core–Skin Debonding and Core Density,” Applied Composite Materials, Vol. 12, pp. 73-91, 2005.
21.Ho, S. S. and Yeh, M. K., “Effects of Geometrical Imperfections on the Buckling of Cured Cylindrical Composite Panels,”The Nineteenth National Conference on Theoretical and Applied Mechanics, Taoyuan, Taiwan, ROC, December 8-9, pp. 153-160,1995
22.Lu, T. J., Xia, Z. C. and Hutchinson, J. W., “Delamination of Beams under Transverse Shear and Bending,”Materials Science and Engineering, A188, pp. 103-112, 1994
23.M. H. Kao and M. K. Yeh, “Delaminatied Plates under Pure Bending and Local Buckling,” Proceedings of the 18th National Conference on Theoretical and Applied Mechanics, Hsinchu, Taiwan, ROC, Vol. 3, pp. 89-96, 1994.
24.M. K. Yeh and S. S. Ho, “Buckling of Delaminated Cylindrical Composite Panel Under Axial Compression,” 2nd International Conference on Composites Engineering, ICCE/2, August 21-24, New Orleans, LA, pp. 845-846, 1995.
25.Whitcomb, J. D., "Finite Element Analysis of Instability Related Delamination Growth, " Journal of Composite Materials, Vol. 15, pp.403-426, 1981
26.J.L. Lataillade & F. Cayssials., " Viscoelastic relaxations in polyepoxide joints related to the strength of bonded structures at impact rate shear loading, " Polymer Engineering And Science, Vol. 37, No. 10, pp. 1655-1663, 1997.
27.S. Zhang & K.J. Hsia., " Modeling the fracture of a sandwich structure due to cavition in a ductile adhesive layer, " Journal of Applied Mechanics, Vol. 68, pp. 93-100, 2001.
28.R. F. Gibson, Principles of Composite Material Mechanics, McGraw-Hill, New York, 2007.
29.Yeh, M. K. and Hsieh, T. H., “ Bending Property of Sandwich Beams with MWNTs/Polymer Nanocomposites as Core Materials,”Key Engineering Materials, Vol.345-346, pp. 1265-1268, 2007.
30.Yeh, M. K., Hsieh, T. H. and Tai, N. H., “Fabrication and Mechanical Properties of Multi-walled Carbon Nanotubes/Epoxy Nanocomposites , ” Materials Science & Engineering A, Vol. 483-484, pp. 289-292, 2008.
31.鄭燕琴，田口品質工程技術理論與實務，中華民國品質管制學會，台灣台北，1993。
32.ANSYS Release 12.0, ANSYS, Inc., PA, 2006.
33.ASTM C393-00, “Standard Test Method for Flexural Properties of Sandwich Constructions,” Annual Book of ASTM Standards, 2000.
34.K. S. Kim and C. S. Hong, “Delamination Growth in Angle-Ply Laminated Composites,” Journal of Composite Materials, Vol. 20, pp. 423-438, 1986.
35.M. K. Yeh and C. M. Tan, “Buckling of Elliptically Delaminated Composite plates,” Journal of Composite Materials, Vol. 28, No. 1, pp. 36-52, 1994.
36.ASTM D3039-00, “Standard Test Method for Tensile Properties of Fiber-Resin Composites,” Annual Book of ASTM Standards, 2000.
37.ASTM D3518-01, “Standard Practice for Inplane Shear Stress-strain Response of Unidirectional Reinforced Plastics,” Annual Book of ASTM Standards, 2001.
38.ASTM D638-03, “Standard Test Method for Tensile Properties of Plastics,” Annual Book of ASTM Standards, Vol. 8.2, 1982.