| Summary: | 碩士 === 國立清華大學 === 動力機械工程學系 === 96 === Composite materials have advantages of high specific strength, high specific stiffness, and can be used in many industries, such as musical instrument, acoustical tile, fire wall, sports equipment, aerospace and vehicle applications. Moreover composite products are used in sandwich structures to reduce the weight of structure, and to increase the mechanical properties, sound insulation and fire prevention properties 0f structure in recent years. In this paper, the mechanical properties of sandwich structure made by graphite face laminates and core material made by multi-walled carbon nanotubes (MWNTs) reinforced polymer were investigated.
In the experiment, the three-point bending test was used to measure the mechanical properties of sandwich structure. The influences of carbon fiber orientation, in the face laminates, and content of MWNTs, in polymer reinforced nanocomposite core material, on the bending strength of sandwich structure were discussed in this paper. In analysis, the finite element method was used to obtain the numerical values of mechanical properties of sandwich structures. The Mode I and II fracture toughness of MWNTs/Polymer nanocomposites were investigated, and the effects of MWNTs content in the nanocomposites were evaluated. The Mode I fracture toughness was tested using compact tension specimens. For determination of the Mode II fracture toughness, the asymmetric four-point bending test were used. The experimented results were compared with ours obtained from the finite element analysis.
|
|---|
