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Influence of a non-Explosive Filling Included in the Conical Liner Cavity of a Shaped Charge on its Penetrative Capability

Warchoł Radosław, Żochowski Paweł, Bagrowski Jan, Gędziorowski Maciej, Sałaciński Tomasz

Central European Journal of Energetic Materials

2023

Vol. 20, no. 4

400--416

Based on literature, it can be concluded that the results obtained for partially or fully filled inert (non-explosive) material of the free space inside the cone created by the liner inside a shaped charge (SC), have not been deeply examined. Preliminary results in this work were obtained for SCs taken from the warhead of an anti-tank rocket-propelled grenade, PG-7WM (also known as PG-7VM). The warhead was modified by perpendicular intersection and by inserting an inert, i.e. made from non-explosive, cone. Each of the inert fillers was prepared from one of the three materials: copper (type M1E), steel S355, aluminium (type 2024) or a polymer (polyoxymethylene, POM-C). The densities of these materials were 8.9, 7.86, 2.7 and 1.41 g/cm³, respectively. Each inert cone was tightly placed inside the inner area of the cumulative liner cone of the warhead. For each filler, there were three types of cones. The differentiating feature between the fillers under test was the difference in their height, i.e. 1/3, 2/3 and the full height of the SC cone. In all tests the effect of the impact of the cumulative jet (SCJ) was observed in an arrangement comprised of three adjacent armoured steel plates (ARMSTAL 30PM), with a total target thickness of 25 mm. It was shown that the application of the inert cones caused significant changes in the dimensions and shapes of the holes through the plates of ARMSTAL 30PM armour steel. The relationship between the densities of tested fillers and the height of the cones made with these fillers versus the effects observed in the armour plate were also taken under account. The filling, obtained from non-explosive material, allows a cut off of the relevant section of the front of the SCJ. It was noted that the tested modifications of the anti-tank rocket-propelled grenade, PG-7WM could find some applications in engineering and sapper work, especially in destroying unexploded munitions.

Ocena skuteczności działania ładunków kumulacyjnych na podstawie rozwiązań numerycznych

Bagrowski Jan, Bazela Rafał, Borkowski Jacek, Podgórzak Paweł, Jach Karol

Problemy Techniki Uzbrojenia

2019

R. 48, z. 149

7--22

W artykule przedstawiono oceny maksymalnych głębokości wnikania strumieni kumulacyjnych w stal pancerną w funkcji odległości od podstawy wkładki. Dane – chwilowe współrzędne położeń, mas oraz prędkości elementów strumieni były wynikiem obliczeń numerycznych działania wybranych konstrukcji ładunków kumulacyjnych. Pokazano, iż głębokość krateru jest funkcją dopuszczalnego wydłużenia elementów strumienia oraz ich minimalnej prędkości. Wyniki porównano z danymi doświadczalnymi.

The paper shows the estimations of maximal penetration depths of shaped charge jets in a steel armour as a function of stand-off distance to the liner base. The data – instantaneous coordinates of positions, masses, and velocities of jet elements was received as results of numerical calculations for selected examples of designs of shaped charges. It was shown that the crater’s depth is a function of acceptable maximal extension of jet elements and their minimal velocity. The results were compared with experimental data.