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<p>Auxetic materials are special materials because of their macro-geometry having a negative Poisson’s ratio. When force is applied to an axial axis, it compresses it and has lateral contractions. Due to these factors, they show unusual mechanical properties compared to conventional materials, which can be applied to absorbing shocks and acoustic insulation. This research aims to design, print, and analyze the acoustic insulation at different compressions of an auxetic structure. The design was made in CAD and the model was 3D printed with a TPU elastomer. The analysis was divided into two parts: a compression test and a study performed in a four-microphone impedance tube. The auxetic structure was placed in the middle of the tube, supported by a press to compress it. Unidirectionally, different frequencies of sound waves were applied to determine and to explain its acoustic properties in different deformations.</p> Graphical abstract <p></p>

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Design, mechanical properties, and acoustic absorption of an auxetic structure with thermoplastic polyurethane

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Luis Roberto González-García,
  • Pablo Marco Trejo-García,
  • Juan José Reyes-Salgado,
  • Argelia Fabiola Miranda-Pérez,
  • Miguel Martínez-Salazar

摘要

Auxetic materials are special materials because of their macro-geometry having a negative Poisson’s ratio. When force is applied to an axial axis, it compresses it and has lateral contractions. Due to these factors, they show unusual mechanical properties compared to conventional materials, which can be applied to absorbing shocks and acoustic insulation. This research aims to design, print, and analyze the acoustic insulation at different compressions of an auxetic structure. The design was made in CAD and the model was 3D printed with a TPU elastomer. The analysis was divided into two parts: a compression test and a study performed in a four-microphone impedance tube. The auxetic structure was placed in the middle of the tube, supported by a press to compress it. Unidirectionally, different frequencies of sound waves were applied to determine and to explain its acoustic properties in different deformations.

Graphical abstract