Influence of the number of contours of a specimen manufactured by FFF on the propagation of acoustic waves
Résumé
This study explores the impact of walls number on the acoustic properties of 3D printed pla samples using fused filament fabrication (FFF). the samples are subjected to three infill patterns (line, combined, and concentric) and four infill densities {100%; 90%; 80%; 70%}, with two levels of contours {0; 3} (without contours and with three contours). variation of these parameters allows for modulation of the volumetric fraction of porosity, thus influencing the acoustic properties of the materials. the results reveal that the addition of contours does lead to a decrease in the velocity of acoustic waves, but rather favors the propagation of waves within the edges of the structure. this phenomenon is identified as guided waves, where contours introduce discontinuities that interfere with wave propagation through the 3D printed material. additionally, the study highlights the influence of modulation of volumetric porosity fraction on wave propagation through the material, thus emphasizing the capability of additive manufacturing to adjust the acoustic characteristics of 3D printed materials. this research enhances our understanding of the interactions between additive manufacturing and the acoustic properties of materials, revealing the criticalrole of contours in structural guided wave phenomena.
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