FIG. 6.

(Color online) Maximum principal stress $\underset{\text{time}}{\text{max}}(T_{\text{max}})$ at the center (r = 0) of a COM stone normalized by the incident plane wave amplitude p₀ as a function of the dimensionless frequency ka. Vertical axis is presented in logarithmic scale, the curves of different colors correspond to different degree of the elastic waves' absorptions characterized by loss tangent $\text{tan}\hspace{0.17em}\delta$.