## 2 Materials
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Test** & **Material** & **Density** & \(\mathbf{V_{L}}\) & \(\mathbf{V_{T}}\) & \(\mathbf{\alpha_{L}}\) & \(\mathbf{\alpha_{T}}\) & **Thickness** & **Size** & **Hardness** & & \\ \hline
**No.** & & **Mg/m\({}^{3}\)** & **mm/μs** & **dB/m/MHz** & **mm** & **mm** & **mm \(\times\) mm** & **VHN** & & \\ \hline G1a & PS & 1.06 & 2.34 & 1.16 & 39 & 113 & 1.38 & \(554\times 433\) & & \(\alpha_{L}\) and \(\alpha_{T}\) measured. * \\ G1b & PS & 1.05 & 2.3 & 1.17 & 39 & 113 & 1.38 & \(602\times 397\) & \(\alpha_{L}\) and \(\alpha_{T}\) of G1a used. * \\ G2a & Al-1100-H18 & 2.7 & 6.18 & 3.08 & 15.7 & 26.5 & 2.06 & \(1133\times 523\) & 41 & \(\alpha_{L}\) and \(\alpha_{T}\) of G2b used. \\ G2b & Al-1100-H18 & 2.7 & 6.18 & 3.08 & 15.7 & 26.5 & 6.38 & \(907\times 306\) & 40 & \(\alpha_{L}\) and \(\alpha_{T}\) measured. \\ G3a & Al-6061-T6 & 2.7 & 6.38 & 3.23 & 4.9 & 10.3 & 12.7 & \(1220\times 1200\) & 109 & \(\alpha_{L}\) and \(\alpha_{T}\) of G3b used. \\ G3b & Al-6061-T6 & 2.7 & 6.4 & 3.17 & 4.9 & 10.3 & 25.3 & \(63.5\times 47.3\) & 122 & Only for damping tests. \\ G4 & Al-7457-H18 & 2.81 & 6.5 & 2.99 & 5.7 & 12.2 & 2.72 & \(610\times 367\) & 123 & \(\alpha_{L}\) and \(\alpha_{T}\) of N190 used. * \\ G5a & Stainless steel 410 & 7.74 & 5.74 & 3.11 & 0.97 & 2.6 & 3.16 & \(1015\times 306\) & 240 & \(\alpha_{L}\) and \(\alpha_{T}\) of G5b used. * \\ G5b & Stainless steel 410 & 7.7 & 5.97 & 3.32 & 0.97 & 2.6 & 104.9 & (38.5 dia.) & 211 & Only for damping tests. \\ G6a & Soda-line glass & 2.55 & 5.73 & 3.43 & 8.7 & 16.2 & 1.98 & \(609\times 578\) & \(\alpha_{L}\) and \(\alpha_{T}\) of C43 used. * \\ G6b & Soda-line glass & 2.49 & 5.9 & 3.3 & 8.7 & 16.2 & 4.72 & \(820\times 450\) & \(\alpha_{L}\) and \(\alpha_{T}\) of C43 used. * \\ G7a & PMMA* & 1.18 & 2.74 & 1.4 & 131 & 420 & 1.76 & \(430\times 338\) & \(\alpha_{L}\) and \(\alpha_{T}\) measured. * \\ G7b & PMMA* & 1.18 & 2.74 & 1.4 & 106 & 216 & 6.3 & \(610\times 610\) & \(\alpha_{L}\) and \(\alpha_{T}\) measured. * \\ G8 & PVC & 1.4 & 2.33 & 1.11 & 239 & 909 & 4.3 & \(812\times 812\) & \(\alpha_{L}\) and \(\alpha_{T}\) of O2c used. * \\ G9 & HDPE & 0.95 & 2.18 & 1.13 & 222 & 1010 & 7.09 & \(585\times 509\) & \(\alpha_{L}\) and \(\alpha_{T}\) of O10 used. * \\ G10 & XP-GRPR\({}^{\lx@sectionsign}\) & 1.81 & 3.84 & 1.99 & 117 & **445** & 2.3 & \(585\times 277\) & \(\alpha_{L}\) and \(\alpha_{T}\) measured. * \\ \hline \hline \end{tabular}   
* Four sheets were glued for attenuation tests. * Test Numbers used in Notes for GA, G6a, G6a, D6 8A and G9 refer to those from [44,45]. * Values of V\({}_{1}\) and density of PMMA were incorrectly listed previously in [44,45]. \({}^{\lx@sectionsign}\) Isotropy assumed for V and \(\alpha\) values listed above. Complete V and \(\alpha\) values are listed below. \begin{tabular}{c c c c c c c c c c c} \hline \hline V\({}_{11}\) & \(\alpha_{11}\) & V\({}_{22}\) & \(\alpha_{22}\) & V\({}_{33}\) & \(\alpha_{33}\) & V\({}_{13}\) & \(\alpha_{13}\) & V\({}_{31}\) & \(\alpha_{31}\) & \(\alpha_{31}\) & V\({}_{32}\) & \(\alpha_{32}\) & unit \\ \hlineThese sheet and plate samples will be collectively called plates, but both terms will be used for a specific case. (Note that the term sheet is commonly used for thickness less than 3 mm for polymers and less than 5 or 6 mm for metallic alloys in various industrial standards.)