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Development and fabrication of an auxetic composite with the shape memory effect for the regeneration of damaged parts
ID Tomažinčič, Dejan (Author), ID Kajbič, Jure (Author), ID Klemenc, Jernej (Author)

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Abstract
The purpose of the article is to present a design of an active composite cellular structure, which consists of two different materials. A flexible polymer matrix is moulded around a pre-braided wire reinforcement, which is made of a high-strength shape memory material NiTi SMA. The composite is formed in a special mould, which enables manufacturing of cellular auxetic specimens. Since the reinforcements are made from the shape memory alloy, this enables temperature activation of the interwoven reinforcement wires to restore the deformed shape. In addition, such a structure can be deformed according to a precisely defined Poisson's ratio. To design this structure, a special finite-element approach was also developed, which enables simulating the response of a super-elastic material with a shape memory effect. The effectiveness of this finite-element approach was verified by experimental testing of the sample specimen that actually deforms according to the desired negative Poisson's ratio. The experimental results confirmed the regeneration ability of the newly developed cellular composite structure.

Language:English
Keywords:ordered porosity, auxetic properties, negative Poisson's ratio, cellular structure, NiTi SMA, shape memory effect
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2026
Number of pages:13 str.
Numbering:Vol. 309, art. 113034
PID:20.500.12556/RUL-175237 This link opens in a new window
UDC:620.168:539.217
ISSN on article:1359-8368
DOI:10.1016/j.compositesb.2025.113034 This link opens in a new window
COBISS.SI-ID:254324483 This link opens in a new window
Publication date in RUL:22.10.2025
Views:537
Downloads:390
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Record is a part of a journal

Title:Composites. Pt. B, Engineering
Shortened title:Compos., Part B Eng.
Publisher:Elsevier
ISSN:1359-8368
COBISS.SI-ID:16857349 This link opens in a new window

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

Language:Slovenian
Abstract:
Namen prispevka je prikaz razvoja in izdelave aktivne kompozitne celične strukture, ki je sestavljena iz dveh povsem različnih materialov. Okoli predhodno spletene žične armature, izdelane iz visoko-trdnostnega materiala z oblikovnim spominom SMA, je ulit fleksibilni polimer, ki predstavlja matrico strukture. Sestav kompozita je oblikovan v kalupu, ki tvori še avksetično celično obliko notranjih vzorcev. Ker je armatura sestavljena iz zlitine NiTi SMA z oblikovnim spominom, to omogoča temperaturno aktivacijo mreže spletenih žic in posledično možnost izvedbe deformacij sestava strukture po točno določenem Poissonovem razmerju. Za potrebe učinkovitega načrtovanja je bil razvit tudi poseben MKE pristop, ki omogoča simulacijo odziva superelastičnega materiala s spominskim efektom. Učinkovitost novega MKE pristopa je bila preverjena z eksperimentalnim testom odzivanja vzorca, ki se dejansko deformira po želenem negativnem Poissonovem razmerju. Prav tako je z eksperimentalnim testom potrjeno regenerativno obnašanje novo razvitega celičnega kompozita.

Keywords:urejena poroznost, avksetičnost, negativno Poissonovo razmerje, celična struktura, oblikovni spomin materiala

Projects

Funder:ARIS - Slovenian Research and Innovation Agency
Project number:Z2-50081
Name:Razvoj celičnega kompozita s sposobnostjo transformacije celic z izbranim aktivacijskim mehanizmom

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