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ICCM 2019
9th-13th July, Singapore, Singapore


Thermal tuning negative effective mass density of acoustic metamaterial with hexagonal lattice


Zhen Li, Xi'an Jiaotong University
Email: lizhen-0226@stu.xjtu.edu.cn


Thermal stress as well as thermal deformation induced by the variation of the environment temperature can affect the elastic wave band gap (BG) of acoustic metamaterial obviously. In this study, the bi-material strip is introduced to design an in-plane thermal deformation and to investigate the variation of the effective mass density of the deformed unit cell. Numerical results show that the in-plane elastic wave BG created by the local resonance shifts to lower frequency and becomes narrower with temperature increasing. Besides, the flexural wave BG created by the local resonance is hardly affected by the in-plane thermal deformation. However, the BGs created by the rotation or torsion of the connectors are widened and transfer to higher frequency with temperature going up, which is due to the deformation of the unit cell being dominated by the rotation of the ligaments before buckling and accompanied the torsion deformation of the ligaments after buckling.