2D/3D structures made from ultra thin (<100 μm) NiTi wires are currently considered in engineering applications in textile, medical or robotics field. Thin NiTi wires have several advantages over bulk elements – they are stronger, show enhanced functional properties, they are less prone to failure and able to be actuated with higher frequencies.

The development and design of such novel applications require the knowledge of the thermomechanical behaviour of NiTi ultra thin wires. First, since the material state of the thin NiTi wires is different from that of the bulk NiTi (texture, cold work etc.), their tensile properties cannot be obtained by simply scaling down the results measured on thicker wires but have to be determined experimentally. Second, since the shape set thin NiTi wires in 2D/3D structures deform by combined bending-tension-torsion, such behaviors have to be determined experimentally as well. Third, since many of the introduced applications attempt to take advantage of the unique damping capabilities of NiTi in a form of thin NiTi wires, it is of utmost interest to investigate their dynamical behavior, particularly the influence of temperature, prestress and vibration amplitude on the damping capacity.

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