Auxetic woven fabrics made with special geometrical structures have gained the interest of textile scientists in recent years. This paper reports a study on auxetic woven fabric based on a double-directional parallel in-phase zig-zag foldable geometrical structure. Such a fabric has been already produced and investigated for its negative Poisson's ratio effect in two principal directions (weft and warp directions). However, its negative Poisson's ratio effect in biased tensile directions as well as under repeated tensile loading conditions has not been studied yet. Therefore, in this paper, these two limitations are addressed. The auxetic woven fabric was firstly fabricated, and then subjected not only to tensile tests in different tensile directions, including two principle directions and three biased directions, but also to repeated tensile loading. It was found that both the negative Poisson's ratio effect and the resistance to tensile deformation are dependent upon the tensile direction, and the highest negative Poisson's ratio effect and higher resistance to tensile deformation are obtained in two principal directions.

中文翻译：

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可折叠几何结构拉胀机织物在不同拉伸方向的变形行为

近年来，由特殊几何结构制成的拉胀机织物引起了纺织科学家的兴趣。本文报道了一种基于双向平行同相锯齿形可折叠几何结构的拉胀机织物的研究。已经生产并研究了这种织物在两个主要方向（纬向和经向）上的负泊松比效应。然而，尚未研究其在偏置拉伸方向以及重复拉伸载荷条件下的负泊松比效应。因此，在本文中，解决了这两个限制。首先制作拉胀机织物，然后不仅进行了不同拉伸方向的拉伸试验，包括两个主方向和三个偏置方向，还要反复拉伸加载。发现负泊松比效应和拉伸变形阻力均取决于拉伸方向，在两个主要方向上获得最高的负泊松比效应和更高的拉伸变形阻力。