Dispersion Properties Of Stress Waves In Kagome Honeycomb

ABSTRACT: In recent years, porous materials, with its unique combination of the multifunctional design and cellular materials, has been causing growing attention due to their unique comprehensive performance. One of the most heated studying issue is how to realize the optimal multifunctional integration of cellular materials. By introducing the finite element software COMSOL MULTIPHYSICS, the band gap structures in combined structure——Kagome honeycomb, can be investigated. Basing on the propagation properties of the stress wave in triangular and hexagonal honeycombs, this paper mainly discusses the influence of the component cells on the total band gap structures of the materials. The results show that:(1) In Kagome honeycomb, only when the porosity is greater than the critical porosity, the high-order absolute stop band would open. With the increase of the porosity, the center frequency of the stop band decreases, as well as the width of the band gap;(2) At the lower porosity, the porosity variation of triangular cells will not change the critical porosity, but the center frequency and band gap width is reduced, meanwhile another low-order absolute band gap will open. The variation of hexagonal cells will decrease the critical porosity, and stop the opening of high-order absolute band gap. By comparing the results of the triangular and hexagonal components of cell element, the conclusion can be concluded that the variation of porosity in hexagonal cells leads to lower central frequency, but that the variation of porosity in triangular ones makes wider band gap.