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This study explores the impact of walls number on the acoustic properties of 3D printed PLA samples using fused filament fabrication (FFF). The samples, with dimensions of 12,7 × 12,7 × 25,4 mm, are subjected to three infill patterns {line, combined, 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. The practical implications of these findings are significant for real-world applications of 3D printing, such as optimizing acoustic performance in engineered materials and structures. This research enhances our understanding of the interactions between additive manufacturing and the acoustic properties of materials, revealing the critical role of contours in structural guided wave phenomena. Furthermore, this study contributes to the broader context of additive manufacturing and materials science by demonstrating how structural modifications at the micro-scale can influence acoustic properties.

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Influence of the Number of Contours of a Specimen Manufactured by FFF on the Propagation of Acoustic Waves

  • 会议论文

  • 发表日期：

    2025年

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  • Makki Ajmi,
  • Simon Bernard,
  • Slim Souissi,
  • Ahmed Elloumi,
  • Pierre Maréchal

摘要

This study explores the impact of walls number on the acoustic properties of 3D printed PLA samples using fused filament fabrication (FFF). The samples, with dimensions of 12,7 × 12,7 × 25,4 mm, are subjected to three infill patterns {line, combined, 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. The practical implications of these findings are significant for real-world applications of 3D printing, such as optimizing acoustic performance in engineered materials and structures. This research enhances our understanding of the interactions between additive manufacturing and the acoustic properties of materials, revealing the critical role of contours in structural guided wave phenomena. Furthermore, this study contributes to the broader context of additive manufacturing and materials science by demonstrating how structural modifications at the micro-scale can influence acoustic properties.