Font Size: a A A

Dispersion Properties Of Stress Waves In Fractal Porous Materials

Posted on:2015-01-15Degree:MasterType:Thesis
Country:ChinaCandidate:C Y HeFull Text:PDF
GTID:2181330467472833Subject:Engineering Mechanics
Abstract/Summary:PDF Full Text Request
Recently, porous materials attract more and more attention due to their distinguish properties, and the potential application in multi-functional design. In this dissertation, the stress wave dispersion in fractal porous materials lattice is investigated by using FEM simulation (COMSOL Multiphysics).The main contents are:(1) To study the two-dimensional linear fractal porous structure stress wave dispersion property, and the influence of porosity on the complete band gap. The results show that the open complete band gap structure has close relationship with porosity. For a triangle hole structure respectively, two triangular hole horizontal arrangement structure, two triangular hole vertical arrangement structure, four triangular hole structure, fractal structure of the case to do the research, in the case of different porosity is studied, and the changes of the structure to open the complete band gap.(2) For certain porosity, the variation of band structure with respect to the distribution of pores for porous structures with two or four triangular in a unit call are investigated. Respectively to study the two triangle hole horizontal arrangement structure and two holes vertical arrangement structure, four triangular hole arrangement and structure of the complete band gap along with the change of cavity position, also studied the fractal, secondary fractal, level3in the case of the same porosity fractal produce complete band gap.(3) The vibration modes of points at the boundaries of complete band gaps are examined.
Keywords/Search Tags:Fractal dimension, porosity, vibration modes, complete band gap, COMSOL Multiphysics
PDF Full Text Request
Related items