Research - PhD - Dynamic control of active textiles:
The integration of nickel-titanium shape memory alloys and the manipulation of woven structures
Abstract
The integration of wire-form, nickel titanium (NiTi), shape memory alloys (SMA), within woven structures, offers the potential to generate unique properties in this bi-material composite. The combination of two materials, one of which can be modified with regard to its stiffness and elastic behaviour, gives further latitude for the textile designer to adapt a combination of functional and aesthetic properties in constructed textiles. To date, there has been limited research into the impact textile structures could have on both direct and indirect shape transfer from an integrated SMA component.
This thesis overviews the integration of shape memory materials in textile structures informed through practice. In combination with a variety of natural and synthetic yarns, the investigation has examined how the manipulation of simple woven structures can be used to alter the direct and indirect mechanical shape transfer characteristics from integrated NiTi components. In particular this thesis examines the influence of cloth sett, woven structure, and choice of yarn in combination with a variety of NiTi wire and ribbon. Composite samples were woven and the mechanical relationship with the integrated NiTi was investigated through a series of bend and tensile tests using mechanical mass loading and resultant extraction. The samples were validated by computer controlled tensile / compression testing machines. Subjective evaluations of visual and tactile properties were also conducted, together with comparative topography and morphology investigations using scanning electron microscopy.
The results of this research have been catalogued forming an extensive technical database, searchable by single or multiple design variables. This database is a valuable resource that will support future decision making within this emerging design field.