Study on the reactive material filled structure under impact loading: The self-distributed multipeak overpressure effect

The reactive materials filled structure (RMFS) is a structural penetrator that replaces high explosive (HE) with reactive materials, presenting a novel self-distributed initiation, multiple deflagrations behavior during penetrating multi-layered plates, and generating a multipeak overpressure behind the plates. Here analytical models of RMFS self-distributed energy release and equivalent deflagration are developed. The multipeak overpressure formation model based on the single deflagration overpressure expression was promoted. The impact tests of RMFS on multi-layered plates at 584 m/s, 616 m/s, and 819 m/s were performed to validate the analytical model. Further, the influence of a single overpressure peak and time intervals versus impact velocity is discussed. The analysis results indicate that the deflagration happened within 20.68 mm behind the plate, the initial impact velocity and plate thickness are the crucial factors that dominate the self-distributed multipeak overpressure effect. Three formation patterns of multipeak overpressure are proposed. • The space distribution model of equivalent deflagration points of reactive material filled structure (RMFS) is developed. • The analytical model describing the self-distributed deflagration behavior of RMFS is developed. • The formation mechanism of multi-peak overpressure subjected to sequential influence from dynamic impact and chemical deflagration is revealed. • Three multipeak overpressure patterns caused by spatiotemporal and multi-source deflagration are discussed.