Abstract
Nonlinear effects can enrich the propagation of elastic waves in mechanical metamaterials, which makes it possible to extend classical phenomena and functions in linear systems to nonlinear ones. In this work, rather than monochromatic waves in similar linear structures, the negative refraction is realized by mixing waves which are generated in nonlinear elastic wave metamaterials. Based on the stiffness matrix and plane wave expansion methods, dispersion curves of in–plane modes resulting from the collinear and non–linear mixings of two longitudinal waves are calculated. In the frequency spectrum, two propagating modes coalesce at exceptional points due to the coupling of in–plane modes, and those points at which the refraction type changes are also exceptional ones. Two kinds of negative refraction can be found in the mixing modes near exceptional points, but each of them needs to be induced in a specific configuration. Moreover, experiments are performed to support the pure negative refraction and beam splitting of the nonlinear elastic waves. Particularly, the parallel configuration is able to separate and extract the nonlinear mode when the single–mode negative refraction occurs, which shows the possibility to design elastic wave device by the negative refraction of nonlinear mixing waves.
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The authors wish to express gratitude for the supports provided by the National Natural Science Foundation of China (Grant Nos. 11991031 and 12021002).
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Zi-Hao Miao performed the numerical simulation and experiment. Yi-Ze Wang discussed about the results and supervised the research.
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Appendices
Appendix A
The elements of \(\mathbf{{K}}_{m}^{j}\) in Eq. (27a), (27b) are
where \(D_{Qmj}^{ \pm} = \chi _{Qmj}^{2} \pm 1\), \(\chi _{Qmj} = \exp \left ( \mathrm{i}\nu _{Qmj}h_{j} \right )\) and
Appendix B
The coefficients \(\varepsilon _{ym}\) in Eq. (32) are
Appendix C
The expressions of matrices \(\mathbf{X}_{zm}\) and \(\mathbf{Y}_{zm}\) in Eq. (36a), (36b) are
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Miao, ZH., Wang, YZ. Negative Refraction of Mixing Waves in Nonlinear Elastic Wave Metamaterials. J Elast (2024). https://doi.org/10.1007/s10659-024-10060-1
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DOI: https://doi.org/10.1007/s10659-024-10060-1