Abstract
Titanium alloys such as Ti6Al4V is amongst the most widely studied metallic materials in the broad context of metal 3D printing. Although the mechanical performances are well understood, the acoustic performance of 3D printed Ti6Al4V, and Ti6Al4V ELI (Extra Low Interstitial) has received limited attention in the literature. As such, this study investigates the normal incidence sound absorption coefficient (α) and Sound Transmission Loss (STL) of both Ti6Al4V and Ti6Al4V ELI samples manufactured using Selective Laser Melting (SLM). The influence of material thickness on acoustic responses and the potential of developing Ti6Al4V micro-perforated panels (MPP) at 400–1600 Hz is also explored. The sound absorption of three aesthetic perforations printed using Ti6Al4V and the influence of a porous back layer was also investigated. The experimental measurements were carried out using an impedance tube following ISO10534-2. The result of the study establishes that 3D printed non-circular perforations featuring porous back-layer can exhibit improved sound absorption coefficient.
Highlights
Structures featuring high mechanical properties, energy absorption and acoustic performance are of interest to numerous sectors such as automotive, aerospace and the built environment [1,2,3]
The base material can affect the acoustic performance of Micro-Perforated Panel (MPP), as a result, non-metallic ma terials are often used resulting in poor structural strength
The methodology adopted follows the work of Atalla and Sgard [52] where it was shown that classical models for MPPs can be reobtained using the equivalent fluid model
Summary
Structures featuring high mechanical properties, energy absorption and acoustic performance are of interest to numerous sectors such as automotive, aerospace and the built environment [1,2,3]. A broadband (100–3150 Hz) high α MPP require thousands of microscopic perforations per square metre where the fabrication becomes chal lenging This has led to several studies [20,21,22] focusing on strategies for reducing the manufacturing costs of MPPs leading to the introduction of slits known as micro-slotted panels (MSPs) [23,24,25]. Studies on the acoustic behaviour of non-circular perforations except for slits are yet to be investigated In this regard, this study explores the potential of developing a 3D printed Ti6Al4V non-circular MPP system focusing on both α and STL. The use of non-circular perforations taking advantage of the design freedom offered by the 3D printing process to exploit the hole interaction effects is investigated [51]
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