Abstract
A generalized supercell model is established to predict band structures of phononic crystals (PnCs) microplate with or without defects. Microstructure effect in elastic flexural waves is described by the modified couple stress theory. The plane-wave expansion (PWE) method and the supercell technique are applied to solve the wave equations. The generalized supercell model contains P × Q square inclusions that can be adjusted according to different situations. The current model can be used to solve various defect state problems of multiphase materials (arbitrary) composite PnCs microplates. Single-point defect and multiple defects cases are calculated. The results demonstrate that the current model can well predict defect states of the PnCs microplates whether there is coupling between defects and supercell or not. This new model can provide help for the design and application of PnCs with multiple defects at the microscale in different fields.
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Funding
GYZ acknowledges the support by the National Natural Science Foundation of China [Grant # 12002086] and the Fundamental Research Funds for the Central Universities [Grant nos # 2242020R10027 and 2242022R40040]. STG acknowledges the support by the National Natural Science Foundation of China [Grant # 11672099]. The authors also would like to thank Prof. Shaofan Li and two anonymous reviewers for their encouragement and helpful comments on an earlier version of the paper.
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Appendices
Appendix A
For J-phase PnCs, \(\alpha _{{\mathbf{G}(M,N)}}\) can be expressed as follows:
when G = 0,
when G ≠ 0,
according to Zhang and Gao[45],
thus, when G ≠ 0,
Appendix B
For the inclusion at position (p, q), the shape function can be expressed as follows:
where
Appendix C
The matrices [K] and [M] in Eq. (11) are given by
where
in which
where \(\alpha_{{{\mathbf{G}} - {\mathbf{G}}^{\prime } }}\) represents \(\left( {S_{1} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\), \(\left( {S_{2} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\), \(\left( {S_{3} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\), \(\left( {S_{4} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\), \(\left( {S_{5} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\), \(\left( {m_{0} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\) and \(\left( {m_{2} } \right)_{{{\mathbf{G}} - {\mathbf{G^{\prime}}}}}\).
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Shen, W., Cong, Y., Gu, S. et al. A generalized supercell model of defect-introduced phononic crystal microplates. Acta Mech 235, 1345–1360 (2024). https://doi.org/10.1007/s00707-023-03804-y
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DOI: https://doi.org/10.1007/s00707-023-03804-y