**5. Conclusions**

In this paper, an AUOTDYN-3D numerical simulation and experimental verification study of the penetration mechanism of the RMP multi-layer metal target was carried out. In addition, the deflagration reaction behavior of the RMP after the penetration of the steel target plate was effectively simulated using the SPH-Lagrange algorithm under different projectile–target interaction conditions. A gunpowder combustion EOS was introduced in the activation part of the reactive core. The scattering behavior of the shell target plate fragments was analyzed along with the subsequent penetration and destruction behaviors. The main conclusions are as follows:


**Author Contributions:** Conceptualization, X.L. and L.Y.; software, C.H.; validation, Y.C.; formal analysis, C.H.; investigation, X.L.; resources, H.T.; writing—original draft preparation, C.H.; writing—review and editing, X.L. and Y.C.; supervision, H.T.; project administration, X.L.; funding acquisition, X.L. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research was funded by the CST Foundation Strengthening Project, and the project No. is 2019JQJCZD01.

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