FIG. 4.

(Color online) Maximum principal stress $\underset{\text{time}}{\text{max}}(T_{\text{max}})$ at the center (r = 0) of 5 and 10 mm diameter COM stones normalized by the incident plane wave amplitude p₀. The exact analytical solution is presented as solid lines, whereas the finite-difference modeling results are shown as circles with 10 kHz frequency steps. Note, we discuss only the peak at the stone center to consider the resonance behavior here, but higher values exist above the lowest resonance off axis.