Development of novel auxetic structures based on braided composites

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

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

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.

LanguageEnglish
Pages286-295
Number of pages10
JournalMaterials and Design
Volume61
Early online date2 May 2014
DOIs
Publication statusPublished - 1 Sep 2014
Externally publishedYes

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Poisson ratio
Composite materials
Epoxy Resins
Polyesters
Tensile testing
Epoxy resins
Glass fibers
Analytical models
Reinforcement
Mechanical properties
fiberglass

Cite this

Subramani, P. ; Rana, Sohel ; Oliveira, Daniel V. ; Fangueiro, Raul ; Xavier, Jose. / Development of novel auxetic structures based on braided composites. In: Materials and Design. 2014 ; Vol. 61. pp. 286-295.
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Development of novel auxetic structures based on braided composites. / Subramani, P.; Rana, Sohel; Oliveira, Daniel V.; Fangueiro, Raul; Xavier, Jose.

In: Materials and Design, Vol. 61, 01.09.2014, p. 286-295.

Research output: Contribution to journalArticle

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