# Dynamic Viscosity and Transverse Ultrasonic Attenuation of Engineering Materials
## 3 Results and Discussion
### Attenuation Behavior of Iron and Ferrous Alloys
\begin{table}
\begin{tabular}{l c c c c c c c c c c c c c c} \hline \hline
**Test.** & **Material** & **C\({}_{\textbf{G}}\)** & **C\({}_{\textbf{G}}\)** & **v** & **n** & **C\({}_{\textbf{G}}\)** & **C\({}_{\textbf{G}}\)** & **v\({}_{\textbf{t}}\)** & **n\({}_{\textbf{t}}\)** & **C\({}_{\textbf{G}}\)/C\({}_{\textbf{G}}\)** & **n/n** & **Tididness** & **Videers** & **Notes** \\ \hline
**No** & & **df/w/** & **df/w/** & **df/w/** & **df/w/** & **df/w/** & **mm/** & & & & & **mm** & **HN** & \\  & & **MHz** & **MHz/** & **dr/z/z** & **bs** & & & & & & & & \\ \hline
991 & 321 & 55.8 & & 5.78 & 1.18\(\times 10^{-3}\) & 23.4 & 2.20\(\times 10^{-2}\) & 3.16 & 2.71\(\times 10^{-3}\) & 0.419 & 0.229 & 34.0 & 196 & \\ P19a & 321 & 61.8 & & 5.76 & 1.30\(\times 10^{-3}\) & 23.4 & 2.20\(\times 10^{-3}\) & 3.16 & 2.71\(\times 10^{-3}\) & 0.579 & 0.228 & 34.0 & 196 & \\ P19b & 321 & 49.1 & & 5.83 & 1.05\(\times 10^{-3}\) & 23.4 & 2.20\(\times 10^{-3}\) & 3.16 & 2.71\(\times 10^{-3}\) & 0.477 & 0.248 & 34.0 & 196 & \\ P194 & 430 (8) & 9.9 & & 5.81 & 2.10\(\times 10^{-3}\) & 9.13 & 3.13 & 1.05\(\times 10^{-3}\) & 0.594 & 0.498 & 24.3 & 312 & \\ P19a & 440 (8) & 9.9 & & 5.81 & 2.10\(\times 10^{-3}\) & 3.50 & 1.24\(\times 10^{-3}\) & 3.31 & 4.48\(\times 10^{-4}\) & 0.398 & 0.213 & 24.3 & 312 & \\ P25 & 440 (8) & 39.5 & & 5.85 & 8.47\(\times 10^{-3}\) & 17.4 & 3.19 & 2.03\(\times 10^{-3}\) & 0.441 & 0.240 & 19.0 & 541 & \\ P25 & 440 (8) & 31.4 & & 5.83 & 6.87\(\times 10^{-3}\) & 17.4 & 3.19 & 2.03\(\times 10^{-3}\) & 0.554 & 0.033 & 19.0 & 541 & \\ P26 & 4286 (5) & 73.1 & & 1.19\(\times 10^{-3}\) & 5.75 & 1.51\(\times 10^{-3}\) & 142. & 6.46\(\times 10^{-1}\) & 3.16 & 1.64\(\times 10^{-2}\) & 1.975 & 1.085 & 139 & 293 & \\ P10 & 7-47 pi & 9.0 & 4.19\(\times 10^{-3}\) & 6.10 & 2.01\(\times 10^{-3}\) & 26.3 & 3.37 & 3.05\(\times 10^{-3}\) & 2.925 & 1.530 & 228.3 & 360 & Solution treated \\ P10a & 17-47 pi & 9.0 & 4.19\(\times 10^{-3}\) & 6.10 & 2.01\(\times 10^{-3}\) & 31.0 & 3.17 & 3.60\(\times 10^{-3}\) & 3.448 & 1.922 & 288.3 & 360 & Solution treated \\ P101 & 7-47 pi & 34.2 & & 5.84 & 7.43\(\times 10^{-3}\) & 53.4 & 3.17 & 6.20\(\times 10^{-3}\) & 1.599 & 0.835 & 254 & 412 & 2480 & 480 \({}^{\circ}\)C \\ P10a & 17-47 pi & 34.2 & & 5.86 & 6.67\(\times 10^{-3}\) & 31.3 & 3.19 & 3.75\(\times 10^{-3}\) & 1.194 & 0.647 & 25.4 & 412 & 24 & 480 \({}^{\circ}\)C \\ P11a & 17-47 pi & 30.0 & & 5.86 & 6.67\(\times 10^{-3}\) & 31.3 & & 3.19 & 3.75\(\times 10^{-3}\) & 1.194 & 0.647 & 25.4 & 412 & 42 & 480 \({}^{\circ}\)C \\ \hline
13 & Gray class 20 & 0 & (35.0\(\pm\) n \(\pm\) 2) & 4.47 & [5.73\(\times 10^{-3}\)] & 0 & (82.0\(\pm\) n \(\pm\) 2) & 2.47 & [0.42\(\times 10^{-3}\)] & 2.343 & 1.295 & 25.0 & 145 & -Asc \\
18 & Gray class 60 & 0 & (187.7\(\pm\) n \(\geq\) 2) & 5.00 & 13.43\(\times 10^{-3}\) & 0 & (20.6\(\pm\) n \(\geq\) 2) & 2.29 & 13.34\(\times 10^{-3}\) & 1.747 & 0.973 & 24.8 & 224 & As-Asc \\
18 & Deduc 80-55-66 & 41.0 & 8.38\(\times 10^{-3}\) & 5.64 & 8.47\(\times 10^{-3}\) & 80.0 & 0.0439 & 3.12 & 9.15\(\times 10^{-3}\) & 1.951 & 1.099 & 25.0 & 282 & As-Asc \\
21 & Mallbank' & 28.5 & 7.90\(\times 10^{-3}\) & 5.82 & 5.76\(\times 10^{-3}\) & 83.3 & 0.0125 & 3.08 & 9.40\(\times 10^{-3}\) & 2.923 & 1.631 & 24.0 & 145 & Heat treated \\  & & Average & & & 6.69\(\times 10^{-3}\) & & & & 3.97\(\times 10^{-3}\) & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: _Cont._When one examines the values of the ratio, \(\mathrm{C_{dt}/C_{d}}\), as well as \(\mathrm{C_{d}}\) and \(\mathrm{C_{dt}}\) on Table 2, 43% of the tests showed lower \(\mathrm{C_{dt}}\) than \(\mathrm{C_{d}}\), (or \(\mathrm{C_{dt}/C_{d}}<0.67\)), while 40% had comparable \(\mathrm{C_{dt}}\) with \(\mathrm{C_{d}}\) (\(0.67\leq\mathrm{C_{dt}/C_{d}}<1.5\)) with the remaining 17% had \(\mathrm{C_{dt}}\) 1.5-times or higher than \(\mathrm{C_{d}}\) (\(1.5\leq\mathrm{C_{dt}/C_{d}}\)). The average of \(\mathrm{C_{dt}/C_{d}}\) values was 1.19 and 50% of the tests resulted in \(0.5<\mathrm{C_{dt}/C_{d}}<1.5\).