A Bending Test Study for Glass Fiber/Epoxy Resins Composite Sandwich Structure

• Main Authors: CHI-HUA PENG, 彭基華
• Other Authors: K. J. Ma
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/08964168197791242253

碩士 === 中華大學 === 機械工程學系碩士在職專班 === 99 === The demand for high degree of strength, corrosion-resistant, and lightweight materials has been rapidly increased in the field of aerospace, automotive and engineering. Due to their good resistance to bending, high strength, and more flexible to be redesigned, composite materials have very wide range of applications. This study focus on how the composite materials are utilized in the sandwich-structure, and to be analyzed for their performance. To construct the sandwich-structure with composite materials, glass fiber/epoxy layer are stacked up as both the top and bottom layer of the structure, while the 30k-ps high-density polystyrene foam is used as the core layer the structure. The experiment on sandwich-structure was conducted by changing several variables, such as the stacking layers of glass fiber, and the thickness of polystyrene foam in the middle layer. Furthermore, the same test was performed again with adding new variables, such as single I beam and double I beam, in order to do the comparison between those two tests. The bending tests were performed to evaluate the performance of sandwich-structure. The results indicate that, when the stacking layers of glass fiber material increase, the specimens can correspondingly withstand greater loading, bending moment, and stress. In addition, the specimens can also withstand greater loading and bending moment when the thickness of core material increases, but not the stress. It is because the same material with the same stack of layers of glass fiber can generate the same value of stress. Furthermore, the sandwich-structure with single I beam and double I beam can tolerate greater loading, bending moment and stress as well. Keywords: glass fiber, epoxy, composites, sandwich structures, bending test.