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Pol Grasland-Mongrain edited Simu disp maps.tex
over 8 years ago
Commit id: f7faeb6d67920f3f0f183575fbd4f54a070ba3bc
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index 61c7749..a2ea750 100644
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This physical phenomenon was then modeled numerically. The vaporization was modeled as a point force directed along Z direction with a depth of 50 $\mu$m and increasing linearly from -2.5 to 0 mm and decreasing symmetrically from 0 to 2.5 mm, to simulate an approximate Gaussian shape. Propagation as a shear wave was calculated using Green operator as calculated by Aki Richards \cite{aki1980quantitative}:
\begin{equation}
u_z = \frac{1}{4\pi \rho
r c_p^2} c_p^2 r} \cos(\beta)^2 \delta_P + \frac{1}{4\pi
r \rho
c_s^2} c_s^2 r} \sin(\beta)^2 \delta_S + \frac{1}{4\pi \rho
r^3 c_p^2} r^3} (3\cos(\beta)^2-1) \tau Rect.
\label{eq:akirichards}
\end{equation}
It used a medium density $\rho$ of 1000 kg.m$^{-3}$, a compression wave speed of 1500 m.s$^{-1}$ and a shear wave speed of 5.75 m.s$^{-1}$. Results are shown on Figure \ref{Figure3} which represents displacement maps along Y and Z axis 0.8, 1.6, 2.4, 3.2 and 4.0 ms after force application. The displacement maps present many similarities with the experimental results of the Figure \ref{Figure2}.