Tubular auxetic structures: A review.

Auxetic materials and structures have been attracting attention due to their extraordinary mechanical properties that stand out due to their high capacity to absorb energy. Some types of auxetic tubular structures have been studied and designed in diverse engineering fields such as mechanical, aerospace and medical. This manuscript cites more than a hundred papers containing the definitions, designs, structural analyses and optimization, mechanical properties, and specific applications of tubular design of auxetic structures. It can be noted from the present paper that additive manufacturing has been one of the most common manufacturing techniques used in many cases to manufacture tubular structures, and numerical analysis was essential to analyzing the behavior of the structures. The purpose of this paper is to assist researchers and engineers in using the methodology step by step to develop and apply auxetic tubular structures. • A review of auxetic tubes: definitions, optimization, properties, and applications. • Discussion about the potential applications of auxetic tubular structures. • Design and mechanical behavior of tubular auxetic structures. • Manufacturing trends of general auxetic structures and auxetic tubes. • Challenges and future directions on the auxetic tubes. [ABSTRACT FROM AUTHOR]