## 3 Results and Discussion
### Effect of Winding Angle  
The tensile failure results of NOL rings with different winding angles are plotted in Figure 4. The relationship between tensile strength and shear strength is as follows:  
\[\sigma_{45^{\circ}}<\sigma_{30^{\circ}}<\sigma_{0^{\circ}}, \tag{4}\]  
where \(\sigma_{45^{\circ}}\) is the failure strength when the winding angle is \(45^{\circ}\), \(\sigma_{30^{\circ}}\) is the failure strength when the winding angle is \(30^{\circ}\), and \(\sigma_{0^{\circ}}\) is the failure strength when the winding angle is \(0^{\circ}\). The maximum tensile strength appears at the \(0^{\circ}\) circumferential winding level, and its size is \(2474\) MPa. The tensile failure values of NOL rings with winding angles of \(45\) and \(30^{\circ}\) are \(1853\) and \(1957\) MPa, respectively. This is determined by the anisotropy of carbon fiber. When winding at \(0^{\circ}\), the force stretches along the direction of the fiber, which can give full play to the bearing capacity of the fiber. The sleeve has good radial and circumferential mechanical properties. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Level**} & \multirow{2}{*}{\begin{tabular}{c} **Winding** \\ **Angle (A)** \\ \end{tabular} } & \multirow{2}{*}{**Fiber (B)**} & \multirow{2}{*}{**Resin (C)**} & \multirow{2}{*}{\begin{tabular}{c} **Tensile Strength** \\ **(MPa)** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Tensile Strength** \\ **Dispersion** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Shear** \\ **Strength** \\ **(MPa)** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **Shear** \\ **Dispersion** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Resin** \\ **Content \%** \\ \end{tabular} } \\ \hline
1 & 45\({}^{\circ}\) & T-700 12k & HBV-SL-03-01 & 1834.54 & 0.12 & 28.07 & 0.15 & 21.58 \\
2 & 30\({}^{\circ}\) & SYT498 12k & HBV-SL-03-02 & 2014.87 & 0.11 & 39.22 & 0.09 & 19.96 \\
3 & 0\({}^{\circ}\) & TZT700s 12k & HBV-SL-03-03 & 1976.96 & 0.04 & 39.12 & 0.14 & 20.27 \\
4 & 45\({}^{\circ}\) & SYT498 12k & HBV-SL-03-03 & 1858.49 & 0.05 & 26.33 & 0.05 & 20.66 \\
5 & 30\({}^{\circ}\) & TZT700s 12k & HBV-SL-03-01 & 1857.85 & 0.07 & 40.33 & 0.15 & 21.12 \\
6 & 0\({}^{\circ}\) & T-700 12k & HBV-SL-03-02 & 2511.87 & 0.06 & 49.13 & 0.10 & 18.74 \\
7 & 45\({}^{\circ}\) & TZT700s 12k & HBV-SL-03-02 & 1865.96 & 0.12 & 35.81 & 0.13 & 18.77 \\
8 & 30\({}^{\circ}\) & T-700 12k & HBV-SL-03-03 & 1999.32 & 0.06 & 31.62 & 0.10 & 17.68 \\
9 & 0\({}^{\circ}\) & SYT498 12k & HBV-SL-03-01 & 2931.68 & 0.04 & 35.25 & 0.14 & 20.66 \\ KA1 & — & — & — & — & 30.07 & — & 20.34 \\ KA2 & — & — & — & 1957.37 & — & 37.06 & — & 19.59 \\ KA3 & — & — & — & 2473.50 & — & 41.17 & — & 19.89 \\ KB1 & — & — & — & 2115.24 & — & 36.27 & — & 19.33 \\ KB2 & — & — & — & 2268.35 & — & 33.60 & — & 20.43 \\ KB3 & — & — & — & 1900.26 & — & 38.42 & — & 20.05 \\ KCl & — & — & — & 2208.02 & — & 34.55 & — & 21.12 \\ KC2 & — & — & — & 2130.90 & — & 41.39 & — & 19.16 \\ KC3 & — & — & — & 1944.92 & — & 32.36 & — & 19.54 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Orthogonal test data of NOL ring samples. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Test Number**} & \multirow{2}{*}{\begin{tabular}{c} **Winding Tension** \\ **(N)** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **Tensile Strength** \\ **(MPa)** \\ \end{tabular} } & \multirow{2}{*}{**Tensile Dispersion**} & \multirow{2}{*}{
\begin{tabular}{c} **Shear Strength** \\ **(MPa)** \\ \end{tabular} } & \multirow{2}{*}{**Shear Dispersion**} & \multirow{2}{*}{**Resin Content \%**} \\ \hline
1 & 70 & 2452.85 & 0.05 & 43.05 & 0.08 & 20.80 \\
2 & 80 & 2341.97 & 0.15 & 39.97 & 0.08 & 20.62 \\
3 & 90 & 2382.57 & 0.04 & 40.06 & 0.06 & 20.27 \\
4 & 100 & 2353.49 & 0.04 & 41.00 & 0.15 & 19.66 \\
5 & 110 & 2256.65 & 0.08 & 41.33 & 0.15 & 19.39 \\
6 & 120 & 2175.62 & 0.07 & 42.12 & 0.08 & 18.95 \\
7 & 130 & 2142.96 & 0.03 & 38.18 & 0.15 & 18.88 \\ \hline \hline \end{tabular}
\end{table}