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Smart Structures and Systems Volume 25, Number 1, January 2020 , pages 57-64 DOI: https://doi.org/10.12989/sss.2020.25.1.057 |
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Experimental dynamic performance of an Aluminium-MRE shallow shell |
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Jiawei Zhang, Tanju Yildirim, Guru Prakash Neupane, Yuechuan Tao, Jiang Bingnong and Weihua Li
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| Abstract | ||
| The nonlinear dynamics of a directly forced clamped-clamped-free-free magneto-rheological elastomer (MRE) sandwich shell has been experimentally investigated. Experiments have been conducted on an aluminium shallow shell (shell A) and an MRE-aluminium sandwich shallow shell with single curvature (shell B). An electrodynamic shaker has been used to directly force shells A and B in the vicinity of their fundamental resonance frequency; a laser displacement sensor has been used to measure the vibration amplitude to construct the frequency-response curves. It was observed that for an aluminium shell (shell A), that at small forcing amplitudes, a weak softening-type nonlinear behaviour was observed, however, at higher forcing amplitudes the nonlinear dynamical behaviour shifted and a strong hardening-type response occurred. For the MRE shell (shell B), the effect of forcing amplitude showed softening at low magnetic fields and hardening for medium magnetic fields; it was also observed the mono-curved MRE sandwich shell changed dynamics to quasiperiodic displacement at some frequencies, from a periodic displacement. The presence of a magnetic field, initial curvature, and forcing amplitude has significant qualitative and quantitative effects on the nonlinear dynamical response of a mono curved MRE sandwich shell. | ||
| Key Words | ||
| shallow shell; experimentation; mechanics; nonlinear experiments; magneto-rheological elastomer | ||
| Address | ||
| (1) Jiawei Zhang, Yuechuan Tao: School of Electrical and Information Engineering, The University of Sydney, Sydney, NSW2006, Australia; (2) Tanju Yildirim, Guru Prakash Neupane: Research School of Electrical, Energy and Materials Engineering, College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601, Australia; (3) Jiang Bingnong: School of Mechanical and Mechatronic Engineering, University of Technology Sydney, Sydney NSW2007; (4) Weihua Li: School of Mechanical, Materials, Mechatronic and Biomedical Engineering, University of Wollongong, Wollongong 2522, Australia. | ||