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首页> 外文期刊>Physica status solidi, B. Basic research >Fabrication of Auxetic Foam Sheets for Sports Applications
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Fabrication of Auxetic Foam Sheets for Sports Applications

机译：用于运动应用的辅助泡沫板的制作

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>Auxetic materials have a negative Poisson's ratio, which can enhance other properties. Greater indentation resistance and energy absorption, as well as synclastic curvature, could lend auxetic materials well to protective sports equipment and clothing. Sheets of foam often form padding within protective equipment, but producing large homogenous auxetic foam samples is challenging. The aim of this work was to investigate techniques to fabricate large thin sheets of auxetic foam, to facilitate future production and testing of prototype sports equipment utilizing this material. A mold was developed to fabricate sheets of auxetic foam ? with planar dimensions measuring 350?×?350?mm ? using the thermo‐mechanical process. The mold utilized through‐thickness rods to control lateral compression of foam. Sheets of auxetic foam measuring 10?×?350?×?350?mmd were fabricated and characterized. Each sheet was cut into nine segments, with density measurements used to determine how evenly the foam had been compressed during fabrication. Specimens cut from corner and centre segments were subject to quasi‐static extension up to 30% to obtain stress versus strain relationships, with Digital Image Correlation used to determine Poisson's ratio. Specimens cut from the corner tended to have a marginally higher density, lower stiffness and more consistent negative Poisson's ratio compared to those from the centre, indicating some inconsistency in the conversion process. Future work could look to improve fabrication techniques for large thin homogenous sheets of auxetic foam.
机译： >辅助材料具有负泊松比率，可以增强其他性质。更大的压痕抗性和能量吸收，以及伴曲线，可以很好地为保护性运动器材和服装提供良好的辅料。泡沫的薄片通常在保护设备内形成填充物，但产生大型均匀的辅助泡沫样品是挑战性的。这项工作的目的是研究制造大型薄膜胶水薄膜的技术，以促进利用这种材料的未来生产和测试。开发模具以制造辅助泡沫片？平面尺寸测量350？×350？mm？使用热机械过程。模具利用通过厚度杆来控制泡沫的侧向压缩。测量10？×350？×350×350×350℃的胶片泡沫纸。制造和表征。将每张片切成九个区段，密度测量用于确定在制造过程中泡沫在制造过程中被压缩的均匀性。从角落和中心段切割的标本受到准静态延伸的约30％，以获得压力与应变关系，数字图像相关性用于确定泊松比。与来自中心相比，从角落切割的标本倾向于具有边缘更高，较低的密度，更低的刚度和更一致的负泊松比，表明转换过程中的一些不一致。未来的工作可以看出改善织造泡沫的大型薄均匀均匀板的制造技术。

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