9 Damaged Metamaterials: Structural Health Monitoring and Damage Tolerance 87 a) b) 7000 6000 5000 4000 3000 2000 1000 0 7000 6000 5000 4000 3000 2000 1000 0 7000 6000 5000 4000 3000 2000 1000 0 7000 6000 5000 4000 3000 2000 1000 0 0 1 2 3 Re(k) hz hz 0 1 2 3 4 Im(k) 0 1 2 3 Re(k) 0 1 2 3 4 Im(k) Fig. 9.15 Complex dispersion curves for the intact beams compared in Figs. 9.13 and 9.14, illustrating that the wave is more trapped in the thin beam, due to the higher Im(k). For clarity, the components of k are not plotted when they are zero. (a) Host thickness 5 mm. (b) Host thickness 10 mm
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