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Non-linear Mechanical Behaviour of Metallic Micro-wires under Dynamic Axial Loads |
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| Authors: | M.?Benedetti,D.?Bortoluzzi author-information" > author-information__contact u-icon-before" > mailto:daniele.bortoluzzi@ing.unitn.it" title=" daniele.bortoluzzi@ing.unitn.it" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,C.?Zanoni |
| Affiliation: | (1) Department of Materials Engineering and Industrial Technologies, University of Trento, Via Mesiano 77, 38123 Trento, Italy;(2) Department of Mechanical and Structural Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy;(3) Italian Institute of Nuclear Physics (INFN), Sezione di Padova, Gruppo Collegato di Trento, 38123 Trento, Italy; |
| 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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