Abstract
Phononic band gap materials are capable of prohibiting the propagation of mechanical waves in certain frequency ranges. Band gaps are produced by combining different phases with different properties within one material. In this paper, we present a novel cellular material consisting of only one phase with a phononic band gap. Different phases are modelled by lattice structure design based on eigenmode analysis. Test samples are built from a titanium alloy using selective electron beam melting. For the first time, the predicted phononic band gaps via FEM simulation are experimentally verified. In addition, it is shown how the position and extension of the band gaps can be tuned by utilizing knowledge-based design.
Highlights
Phononic band gap materials are capable of prohibiting the propagation of mechanical waves in certain frequency ranges
A lot of studies have been dedicated to phononic crystal systems with periodic variation of density and large mismatches in wave speed periodically modulated on a length scale comparable to the desired wavelength based on multi-phase systems[1,2,3,4]
We present a novel approach of designing the unit cell of a single phase three-dimensional cellular structure leading to complete and tunable phononic band gaps
Summary
For the fabrication of these cellular structures additive manufacturing is an ideal technique due to its capability to fabricate complex geometrical components. Selective Electron Beam Melting (SEBM) is used, which is a powder-bed based generative manufacturing technique. Due to their high geometric freedom, both SEBM and SLM (Selective Laser Melting) have been used to build metallic lattice materials for structural applications[25] and/or to demonstrate novel properties such as the auxetic effect[24]. As SEBM is a powder based process, the side and bottom areas of the struts are in contact with the surrounding powder bed.
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