Auxetic structures are a special class of structural components that exhibit a negative Poisson’s ratio (NPR) because of their constituent materials, internal microstructure, or structural geometry. To realize such structures, specialized manufacturing processes are required to achieve a dimensional accuracy, reduction of material wastage, and a quicker fabrication. Hence, additive manufacturing (AM) techniques play a pivotal role in this context. AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy. Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task. In this study, a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is presented. The advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional structures. Therefore, the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic structures. The article opens with a brief history of the growth of auxetic materials and later auxetic structures. Subsequently, discussions centering on the different AM techniques employed for the realization of auxetic structures are conducted. The basic principle, advantages, and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of research. Furthermore, the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and shortcomings. In addition, the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the later-mentioned applications. Finally, valuable insights into the applications, limitations, and prospects of AM for auxetic structures are provided to enable the readers to gauge the vitality of such manufacturing as a production method.

拉胀结构是一类特殊的结构组件，由于其构成材料、内部微观结构或结构几何形状，它们表现出负泊松比 (NPR)。为了实现这种结构，需要专门的制造工艺来实现尺寸精度、减少材料浪费和加快制造速度。因此，增材制造 (AM) 技术在这方面发挥着关键作用。增材制造是一种逐层制造工艺，可根据设计的几何形状以相当高的精度和准确度构建结构。因此，使用 AM 制造拉胀结构非常有益，否则这是一项繁琐且昂贵的任务。在本研究中，详细讨论了用于制造拉胀结构的各种增材制造技术。AM 领域提出的进步和优势为非常规结构的制造和开发提供了大量机会。因此，作者试图对与拉胀结构相关的最新进展进行有意义的概括和详细讨论。这篇文章首先简要介绍了拉胀材料和后来的拉胀结构的发展历史。随后，围绕用于实现拉胀结构的不同 AM 技术进行了讨论。讨论了这些过程的基本原理、优点和缺点，以深入了解当前的研究水平。此外，讨论了通过这些方法实现的一些突出的拉胀结构的性能，以比较它们的优点和缺点。此外，通过综合审查评估几何和工艺参数对此类结构的影响，以评估其在后面提到的应用中的可行性。最后，提供了关于增材制造在拉胀结构中的应用、局限性和前景的宝贵见解，使读者能够衡量这种制造作为一种生产方法的生命力。