# Evolution of full phononic band gaps in periodic cellular structures

## TL;DR

This paper experimentally demonstrates the existence and evolution of phononic band gaps in periodic cellular structures, showing how structural variations influence wave manipulation capabilities.

## Contribution

It provides the first experimental validation of phononic band gaps in cellular structures and explores how cell number and orientation affect gap formation.

## Key findings

- Clear phononic band gaps are observed in cellular structures.
- The minimum number of cells for a band gap is identified.
- Cell rotation does not affect the formation of the band gap.

## Abstract

Cellular materials not only show interesting static properties but can also be used to manipulate dynamic mechanical waves. In this contribution, the existence of phononic band gaps in periodic cellular structures is experimentally shown via sonic transmission experiment. Cellular structures with varying numbers of cells are excited by piezoceramic actuators and the transmitted waves are measured by piezoceramic sensors. The minimum number of cells necessary to form a clear band gap is determined. A rotation of the cells does not have an influence on the formation of the gap, indicating a complete phononic band gap. The experimental results are in good agreement with the numerically obtained dispersion relation.