| Summary: | 碩士 === 逢甲大學 === 機械工程學系 === 89 === The purpose of this study is to determine the effective elastic moduli of foamed short-fiber-reinforced-structures under the variation of void aspect ratio, short-fiber aspect ratio, fiber volume fraction and porosity. The method developed for the determination of the effective elastic moduli is based upon Eshelby’s equivalent inclusion method. Then, the fundamental nature frequencies can be obtained by using finite element method. In this study, the matrix of the short-fiber-reinforced-structure is the concrete as the theoretical and experimental demonstration. The results obtained from numerical simulation are compared with those experimentally obtained from the fast-Fourier-transform (FFT) technique. Meanwhile, the damping capacities of foamed short-fiber-reinforced- structure with different void aspect ratio, fiber aspect ratio, fiber volume fraction, and porosity are also measured by using free-vibration-decay technique. Based on resonant dwell tests and bandwidth tests, the specimen turns out the results of damping loss factor for the foamed short-fiber-reinforced-concrete structure, which was driven in its first mode while the resonant frequency, input acceleration and bending strain were measured.
|
|---|
