**5. Conclusions**

To understand the mechanisms of impact-induced deflagration reactions by RMPs more clearly, a simulation method is presented in this study. High-velocity impact experiments were performed to prove the validity of the simulations. The ignition indicator, reaction ratio, pressure, and temperature distribution are analyzed in detail. The results show that the equivalent plastic stress is more likely to dominate the ignition of RMs instead of the high-pressure pulse produced immediately after impact, because no remarkable increase of the ignition indicator was observed when the pressure reached its maximum value during impact. The history curve of reaction ratio and temperature distribution of RMPs was obtained using a numerical simulation. The increasing trend of the reaction ratio is well consistent with the change of radiated fire light in experiments, and the calculated temperature is reasonable compared to experiment results reported in other studies. In summation, the presented simulation method is able to reproduce the impact-induced deflagration behavior of a reactive materials projectile.

**Author Contributions:** Conceptualization, J.X. and X.L., methodology, C.H.; software, J.X.; formal analysis, D.Z.; data curation, Y.W.; writing—original draft preparation, J.X.; writing—review and editing, X.L.; funding acquisition, J.X. All authors have read and agreed to the published version of the manuscript.

**Funding:** The research was funded by National Natural Science Foundation of China (Grant No. 11702256), Natural Science Foundation of Shanxi Province (Grant No. 20210302124214), Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (Grant No. 201802071), and Scientific and Technological Innovation Team Programs of North University of China (Grant No.TD201903).

**Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable.

**Data Availability Statement:** The data that support the findings of this study are available from the corresponding author upon reasonable request.

**Conflicts of Interest:** The authors declare no conflict of interest.
