Negative and positive stiffness in auxetic magneto-mechanical metamaterials

Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences - Tập 474 Số 2215 - Trang 20180003 - 2018
Krzysztof K. Dudek1, Ruben Gatt1, Mirosław R. Dudek2, Joseph N. Grima3,1
1Metamaterials Unit, Faculty of Science, University of Malta, Msida 2080, Malta
2Institute of Physics, University of Zielona Gora, ul. Szafrana 4a, 65-069 Zielona Gora, Poland
3Department of Chemistry, Faculty of Science, University of Malta, Msida 2080, Malta

Tóm tắt

This work discusses the concept of allowing the control of the stiffness of a particular class of re-entrant auxetic magneto-mechanical metamaterials through the introduction of magnets to the system. It is shown, through experimental testing backed up by a theoretical model, that the appropriate insertion of magnets in such a system will alter its stiffness, possibly even making it exhibit ‘negative stiffness’. This leads to a completely different behaviour of the structure in terms of stability. It is also reported that the investigated mechanical metamaterials may exhibit both negative stiffness and negative Poisson's ratio at the same time. Moreover, it is shown that the effect which magnets have on the stiffness of the system may be fine-tuned upon replacing magnets with electromagnets. Such systems have the potential to be used in a wide range of practical applications such as vibration damping devices where achieving a negative stiffness is of fundamental importance.

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Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences

Tập 474 Số 2215

20180003

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