## 3 Results
### Dynamic Stress-Strain Curve  
The stress-strain curves of aluminum oxide fiber concrete with different fiber contents and different impact compression speeds can be obtained by putting the data collected in the process of impact compression into Formula (1). The stress-strain curve is the representation data of the impact compression test and the full angle embodiment of the impact compression capacity of aluminum oxide fiber concrete under different dependent variable conditions. The stress-strain curves of each test group are shown in Figure 6.  
According to the stress-strain curves of each group of specimens, the stress-strain curves of the PCCY and ACCY test groups are compared horizontally, and the basic shape is indented \"sawtooth\". The stress-strain curve of a single specimen and the horizontal axis of the coordinate form a quasi triangle with a rounded top angle. \begin{table}
\begin{tabular}{c c c c c c c} \hline \multirow{2}{*}{PCCY} & Impact velocity & 6.04 m/s & 7.11 m/s & 7.93 m/s & 9.07 m/s & 10.03 m/s \\ \cline{2-7}  & Strain rate & 60.20 s\({}^{-1}\) & 69.55 s\({}^{-1}\) & 83.98 s\({}^{-1}\) & 97.60 s\({}^{-1}\) & 115.13 s\({}^{-1}\) \\ \cline{2-7}  & Broken level & 1 & 2 & 3 & 3 & 4 \\ \hline \multirow{4}{*}{1 ACCY} & Impact velocity & 6.02 m/s & 7.06 m/s & 8.10 m/s & 8.99 m/s & 10.09 m/s \\ \cline{2-7}  & Strain rate & 70.67 s\({}^{-1}\) & 81.67 s\({}^{-1}\) & 91.05 s\({}^{-1}\) & 98.87 s\({}^{-1}\) & 114.79 s\({}^{-1}\) \\ \cline{2-7}  & Broken level & 1 & 2 & 2 & 3 & 4 \\ \hline \multirow{4}{*}{2 ACCY} & Impact velocity & 6.07 m/s & 7.05 m/s & 8.00 m/s & 9.14 m/s & 10.05 m/s \\ \cline{2-7}  & Strain rate & 66.23 s\({}^{-1}\) & 83.87 s\({}^{-1}\) & 93.88 s\({}^{-1}\) & 98.57 s\({}^{-1}\) & 113.97 s\({}^{-1}\) \\ \cline{2-7}  & Broken level & 1 & 2 & 3 & 2 & 4 \\ \hline \multirow{4}{*}{3 ACCY} & Impact velocity & 5.98 m/s & 7.03 m/s & 8.02 m/s & 9.09 m/s & 9.94 m/s \\ \cline{2-7}  & Strain rate & 82.92 s\({}^{-1}\) & 93.37 s\({}^{-1}\) & 100.34 s\({}^{-1}\) & 105.21 s\({}^{-1}\) & 109.39 s\({}^{-1}\) \\ \cline{2-7}  & Broken level & 1 & 2 & 3 & 3 & 4 \\ \hline \multirow{4}{*}{4 ACCY} & Impact velocity & 5.99 m/s & 7.01 m/s & 7.93 m/s & 8.95 m/s & 10.07 m/s \\ \cline{2-7}  & Strain rate & 63.51 s\({}^{-1}\) & 84.80 s\({}^{-1}\) & 90.03 s\({}^{-1}\) & 101.11 s\({}^{-1}\) & 106.54 s\({}^{-1}\) \\ \cline{2-7}  & Broken level & 1 & 2 & 3 & 3 & 3 \\ \hline \multirow{4}{*}{5 ACCY} & Impact velocity & 6.07 m/s & 6.98 m/s & 8.02 m/s & 8.91 m/s & 9.96 m/s \\ \cline{2-7}  & Strain rate & 59.66 s\({}^{-1}\) & 69.04 s\({}^{-1}\) & 85.78 s\({}^{-1}\) & 95.90 s\({}^{-1}\) & 104.08 s\({}^{-1}\) \\ \cline{2-7}  & Broken level & 2 & 3 & 3 & 4 & 4 \\ \hline \end{tabular}
\end{table} 
Table 2: Breakage grade of specimen after impact compression. Figure 6: _Cont._Under impact compression load, the stress-strain curve of each group of specimens can be divided into enhanced compaction stage, stable elastic stage, critical plastic stage, and failure fragmentation stage. The analyses of each stage are as follows:  
1. When the specimen is in the enhanced compaction stage, the compression degree of the incident bar to the specimen is small. Due to the original pores and cracks caused by the manufacturing process and its own hydration, the compressed volume of the incident bar becomes smaller, and the concrete around the pores continues to replace its original space. In the stress-strain curve, the stress increases slowly and the slope of the curve increases continuously in the initial compaction stage, when the void space inside the specimen is completely occupied by concrete, the slope of the curve reaches the extreme value. 2. When the specimen is in the stable elastic stage, the compression degree of the incident rod to the specimen continues to improve. At this time, due to the reduction in pores, the composite multiphase specimen establishes a stable structure among aggregate, cement-based, and fiber in the one-dimensional stress process to jointly bear the load.