Advances in the field of auxetics have realized fabricated auxetic materials such as foams, fabrics, and fibers as well as a better theoretical understanding of the auxetic response. Because of their unique properties and applications, commodity auxetic materials are particularly desirable. Needle-punched nonwovens, several kinds of paper, and many knitted and woven fabrics have the potential to be auxetic, either as-produced or through a processing or design solution. In this study, we examine the out-of-plane Poisson’s ratio of as-produced and heat-compressed wool nonwovens. The wool nonwovens were found to be out-of-plane auxetic as-produced, and their auxetic character became more pronounced at higher treatment temperatures. Their behavior could be similar to that of paper, where straightening of a bent fiber was responsible for thickness increase. The prescribed processing conditions to enhance auxeticity could potentially be incorporated in their existing production, providing a pathway to generating commodity auxetics.

声学领域的进步已经实现了人造的泡沫材料，例如泡沫，织物和纤维，以及对声学响应的更好的理论理解。由于其独特的性能和应用，特别需要商品膨胀材料。针刺无纺布，几种纸张以及许多针织和机织织物，无论是生产的还是通过加工或设计解决方案的，都具有潜在的发粘性。在这项研究中，我们检查了制成的和热压的羊毛非织造布的平面外泊松比。发现羊毛非织造布在生产时具有平面外的拉长性，并且它们的拉长性在更高的处理温度下变得更加明显。他们的行为可能类似于纸上的行为，弯曲纤维的拉直导致厚度增加。可以将规定的加工条件提高增稠性，将其潜在地纳入其现有生产中，从而为产生商品增稠剂提供一条途径。