Development of novel auxetic structures based on braided composites

P. Subramani, Sohel Rana, Daniel V. Oliveira, Raul Fangueiro, Jose Xavier

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


Auxetic materials are a class of materials that expand transversely when stretched longitudinally. Recently, auxetic materials are gaining special interest in the technical sectors mainly due to their attractive mechanical behavior. This paper reports, for the first time, the development of auxetic structures from composite materials and the characterization of their auxetic as well as mechanical properties. Five different auxetic structures were developed varying their structural angle using core reinforced braided composite rods, containing glass fibers for axial reinforcement, polyester filaments for braided structure and epoxy resin as the matrix. Auxetic behavior of these structures was studied in a tensile testing machine using an image-based tracking method. Additionally, an analytical model was used to calculate Poisson's ratio of these structures. According to experimental and analytical results, auxetic behavior and tensile characteristics of these structures were strongly dependant on their initial geometric configuration (i.e. structural angle). These novel auxetic structures exhibited Poisson's ratio in the range of -0.30 to -5.20.

Original languageEnglish
Pages (from-to)286-295
Number of pages10
JournalMaterials and Design
Early online date2 May 2014
Publication statusPublished - 1 Sep 2014
Externally publishedYes


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