## 3 ANSYS Analyses Results
### Solid Rotor Simulation Results
#### 3.1.3 10 mm Layered Hybrid Rotor Simulation Results  
The performance obtained with the rotor structure with a 10 mm CFRP outer layer is higher than the solid and thinner multi-layered rotor structure. The simulation results given in Table 8 clearly show that the RPM value that can be reached with the rotor with the 10 mm CFRP layer is 20% more than the solid rotor for mild steel. This ratio is 15% for titanium alloy. In terms of weight, the mild-steel rotor with the 10 mm CFRP layer is 23% lighter than the solid steel rotor. Similarly, the titanium alloy rotor with the 10 mm CFRP layer is 18% lighter than the solid titanium alloy rotor. This means that the energy that can be stored with the hybrid rotor is 8-10% higher. At this point, when comparing the 10 mm CFRP layer with the 5 mm CFRP layer, the 10 mm layer shows lower performance. This is because the decrease in rotor mass has a greater effect than the increase in speed. These results show that there is an optimum point in terms of performance increase in the multi-layered structure. Visuals of the simulation results are given in Figure 10.  
Figure 9: Simulation visuals: stress and rupture values for steel and titanium alloys with 5 mm CFRP layer. 3.1.4. 20 mm Layered Hybrid Rotor Simulation Results  
The performance obtained with the rotor structure with the 20 mm CFRP outer layer is higher than the solid and thinner multi-layered rotor structure. The simulation results given in Table 9 clearly show that the RPM value that can be reached with the rotor with the 20 mm CFRP layer is 45% higher than the solid rotor for mild steel. This ratio is 30% for titanium alloy. In terms of weight, the mild-steel rotor with a 20 mm CFRP layer is 41% lighter than the solid steel rotor. Similarly, the titanium alloy rotor with a 20 mm CFRP layer is 33% lighter than the solid titanium alloy rotor. This means that the energy that can be stored with the mild-steel CFRP hybrid rotor is 23% higher. This value is 14% for the  
Figure 10: Simulation visuals: stress and rupture values for steel and titanium alloys with 10 mm CFRP layer. \begin{table}
\begin{tabular}{c c c c c} \hline
**Amb. Temp.: 22 \({}^{\circ}\)C** & **Mild Steel** & **Mild Steel** & **Titanium Alloy** & **Titanium Alloy** \\ \(O\) 100 mm Rotor with** & + & **+** & **+** & **+** \\
**10 mm CFRP Layer** & **10 mm CFRP** & **10 mm CFRP** & **10 mm CFRP** & **10 mm CFRP** \\ \hline  & Yield Point & Rupture Point & Yield Point & Rupture Point \\ Speed (RPM) & 60,600 & 82,140 & 144,850 & 155,350 \\ Weight (kg) & 2.04 + 0.2 & 2.04 + 0.2 & 1.2 + 0.2 & 1.2 + 0.2 \\ Minimum (MPa) & 0.96 & 1.77 & 1.37 & 1.58 \\ Maximum (MPa) & 250 & 460 & 930 & 1070 \\ \hline \end{tabular}
\end{table} 
Table 8: Rupture and yield stress values of 100 mm rotor with 10 mm CFRP layer. titanium alloy-CFRP hybrid rotor. Similar to the 10 mm layered mild-steel-CFRP structure, a performance decrease is observed in the 20 mm layered rotor in the titanium alloy-CFRP structure. Visuals of the simulation results are given in Figure 11.  
Figure 11: Simulation visuals: stress and rupture values for steel and titanium alloys with 20 mm CFRP layer. \begin{table}
\begin{tabular}{c c c c c} \hline
**Amb. Temp.: 22 \({}^{\circ}\)C** & **Mild Steel** & **Mild Steel** & **Titanium Alloy** & **Titanium Alloy** \\ \(\mathcal{O}\) 100 mm Rotor with & **+** & **+** & **+** & **+** \\
**20 mm CFRP Layer** & **20 mm CFRP** & **20 mm CFRP** & **20 mm CFRP** & **20 mm CFRP** \\ \hline  & Yield Point & Rupture Point & Yield Point & Rupture Point \\ Speed (RPM) & 73,500 & 96,650 & 163,860 & 175,800 \\ Weight (kg) & 1.33 + 0.36 & 1.33 + 0.36 & 0.8 + 0.36 & 0.8 + 0.36 \\ Minimum (MPa) & 2.1 & 3.8 & 3 & 1.5 \\ Maximum (MPa) & 250 & 460 & 930 & 1071 \\ \hline \end{tabular}
\end{table} 
Table 9: Rupture and yield stress values of 100 mm rotor with 20 mm CFRP layer. In the obtained results, it is observed that increasing the CFRP layer thickness above a certain value does not provide the expected increase in performance (in terms of stored energy).