Mechanical analysis reveals superior bending resistance and energy absorption in peanut-perforated auxetic tubes, highlighting design strategies for impact-resistant structural metamaterials.
The perforated auxetic tube with peanut-shaped perforations (PHT) are proposed and its mechanical responses are investigated by three-point bending experiment and validated finite element simulation. Compared to the auxetic tube with elliptical perforations (EHT) under the same porosity, the PHT exhibits significant improvement of up to 100%, 49%, 34%, and 148% in peak force, bending stiffness, ductility and energy absorption capacity, respectively. Additionally, a parametric analysis is performed to identify the role of each design parameter and provide optimal solutions for the PHT design. This study provides valuable guidance for enhancing the bending mechanical properties of perforated auxetic tubes.
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Gong et al. (2025) studied this question.
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