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June 11, 2026MaterialsOpen Access

Characterizing the Anisotropic Elastic Properties of Auxetic Structures by Impulse Excitation Technique Combined with Inverse Parameter Identification

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Authors

JRJulian RechHochschule Bonn-Rhein-SiegYLYuchen LengTH Köln - University of Applied SciencesSRStefan ReinholzTH Köln - University of Applied Sciences

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Implication

Experimental–numerical approach characterizes elastic properties in auxetic structures, indicating design improvements.

Key Points

  • This study aims to determine the elastic properties of auxetic metamaterials using innovative techniques.
  • Characterization of PLA-based auxetic sandwich structures through tensile testing and various material property measurements.
  • Impulse excitation technique measurements assessed geometrical dependencies and resonant frequencies.
  • Finite element modal analyses with inverse parameter identification were conducted to determine effective elastic properties.
  • Elastic properties showed significant anisotropy and orientation-dependence, including a negative Poisson's ratio in specific configurations.
  • Impulse excitation technique provided reproducible results, significantly enhancing the identification of material characteristics.
  • Classical ASTM evaluations yielded non-physical properties, underscoring the need for innovative characterization methods.

Cite This Study

Rech et al. (2026) studied this question.

synapsesocial.com/papers/6a2a505d80c8f91e7f39cdc6https://doi.org/10.3390/ma19122479
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