Mechanics–thermotics–chemistry coupling response model and numerical simulation of reactive materials under impact load.

• A mechanics–thermotics–chemistry coupling response model for energetic materials was developed based on the MPM3D. • The continuous expansion and thickening of jet due to high-temperature and high-pressure products leads to the decrease of penetration depth and the increase of crater diameter. • The simulation results of reactive materials jet against steel targets agree well with the experimental results. With its unique kinetic penetration/chemical implosion combined damage ability, reactive damage element (RDE) can greatly or even leap the damage power of ammunition warhead, and has a promising application prospect in the field of ammunition. However, due to the high transient and nonlinear characteristics of shock release process, there is still a lack of real-time quantitative research methods to investigate its energy release process under impact loads, which makes it difficult to conduct in-depth analysis of its efficient damage mechanism. In this paper, the Grüneissen equation of state in the P-V-T form is derived to solve the problem of the mechanics–thermotics–chemistry coupling response (MTCCR) of reactive materials (RMS) under impact load, and the calculation model of RMS temperature under impact is established. Based on the pressure equilibrium criterion, a two-phase theoretical model of the reaction flow field between the RMS reactant and the reaction product was proposed. Combined with the impact temperature rise theory, heat conduction theory and the Arrhenius chemical reaction kinetic model, the MTCCR model of RMS was established. The method of material point-impact induced chemical reaction (MPM-SICR) is presented and the energy release behavior of RMS is quantitatively researched in real-time. This method is used to numerically simulate the formation and impact induced energy release behavior of reactive materials jet against steel target. The simulation results are in good agreement with the experimental results, indicating that the model and method proposed in this paper can well characterize the dynamic MTCCR behavior of the RDE under the impact. [ABSTRACT FROM AUTHOR]