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Non-linear Mechanical Behaviour of Metallic Micro-wires under Dynamic Axial Loads

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Abstract

Metallic micro-wires (diameter ≈10 μm) are widely used to suspend reference bodies and isolate them from micro-seismic vibration because of their low bending and torsional stiffness. They make it possible to realize torsion/swing low-resonant frequency oscillators, spectrally separable from the higher frequency physics of interest. In this study, metallic micro-wires are used to provide both seismic isolation through flexural compliance and high-speed actuation thanks to axial stiffness. An experimental apparatus is realized to characterize the dynamic response of a 25 μm diameter tungsten wire used to actuate a suspended mass (10-2 kg) subjected to accelerations up to 0.2 m/s2. A theoretical non-linear model taking into account flexural and axial behaviour of the wire is developed and validated experimentally. Such a model makes it possible to predict the actual motion of the object, which significantly differs from that of the actuator.

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Authors and Affiliations

  1. Department of Materials Engineering and Industrial Technologies, University of Trento, Via Mesiano 77, 38123, Trento, Italy

    M. Benedetti

  2. Department of Mechanical and Structural Engineering, University of Trento, Via Mesiano 77, 38123, Trento, Italy

    D. Bortoluzzi & C. Zanoni

  3. Italian Institute of Nuclear Physics (INFN), Sezione di Padova, Gruppo Collegato di Trento, 38123, Trento, Italy

    M. Benedetti & D. Bortoluzzi

Authors
  1. M. Benedetti
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  2. D. Bortoluzzi
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  3. C. Zanoni
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Correspondence to D. Bortoluzzi.

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Benedetti, M., Bortoluzzi, D. & Zanoni, C. Non-linear Mechanical Behaviour of Metallic Micro-wires under Dynamic Axial Loads. Exp Mech 52, 215–228 (2012). https://doi.org/10.1007/s11340-011-9485-0

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  • DOI: https://doi.org/10.1007/s11340-011-9485-0

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