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<p>This work presents a newly designed, smart design of shape memory alloys (SMAs)-based auxetic structure with auxeticity and stiffness tunability for advanced engineering applications, and then numerically explores its tunability and mechanical information. The SMA component is placed at the right location, helping it be exposed to the maximum load. The numerical homogenization accuracy of the introduced unit cells in the elastic domain is verified experimentally in terms of effective elastic stiffness. Interestingly, the results show significant auxeticity and stiffness tunability of the structure by adjusting the temperature. Astoundingly, a higher frame material stiffness can widen further the range of the auxeticity and stiffness tunability, and the auxeticity of the structure is found to be enhanced with a higher deformation and temperature. Uniquely, the structure possesses an extreme phase transformation-induced anisotropy, and a profile of multiaxial critical stress surface exceptional to that of non-auxetic materials, with critical stress lying on two parallel lines, opposite orientation, and unable to be outside the lower and upper bounds regardless of the change of biaxial load value.</p>

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Design and mechanical performance of a newly designed auxetic material with tunable stiffness and auxeticity using shape memory alloys

  • 期刊论文

  • 发表日期：

    2025年10月27日

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  • Anh-Tuan Tong,
  • Nguyen-Van Viet,
  • Anh-Tuan Tran,
  • Bao-Viet Tran

摘要

This work presents a newly designed, smart design of shape memory alloys (SMAs)-based auxetic structure with auxeticity and stiffness tunability for advanced engineering applications, and then numerically explores its tunability and mechanical information. The SMA component is placed at the right location, helping it be exposed to the maximum load. The numerical homogenization accuracy of the introduced unit cells in the elastic domain is verified experimentally in terms of effective elastic stiffness. Interestingly, the results show significant auxeticity and stiffness tunability of the structure by adjusting the temperature. Astoundingly, a higher frame material stiffness can widen further the range of the auxeticity and stiffness tunability, and the auxeticity of the structure is found to be enhanced with a higher deformation and temperature. Uniquely, the structure possesses an extreme phase transformation-induced anisotropy, and a profile of multiaxial critical stress surface exceptional to that of non-auxetic materials, with critical stress lying on two parallel lines, opposite orientation, and unable to be outside the lower and upper bounds regardless of the change of biaxial load value.