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Experimentation Using Hot and Cold Steel Plate Targets Against 7.62 x 54RMM B32 API Ammunition

C. GIRDLESTONE, P. PITCHER, A. COOK, N. J. LYNCH, D. PATTEN

Abstract


Senf and Rothenhäusler [1] carried out a series of ballistic tests using 7.62 mm ball and Armour Piercing (AP) rounds at three different grades of structural steel over a temperature range of -20 ºC to +80 ºC and at velocities between 700m.s-1 and 850 m.s-1. For all three structural steels tested, they found that, with decreasing temperature, the V50 Ballistic Protection Limit (V50 BPL or V50) increased and, at the temperature extremes, the V50 varied between 20 m.s-1 (~2.5%) to 40 m.s-1 (~5%). This indicates that both the ballistic performance of the target plate is temperature dependent and that this temperature dependence varies with the type of steel. Lynch et al. [2] have previously reported the characterisation of Low Carbon Steels (LCS) at hot and cold temperatures against 7.62 mm Ball. At the time of publication, the 7.62 x 54Rmm B32 API testing had not been completed and could not be reported. This paper continues further with additional 7.62 mm ball and AP ammunition experiments using Hot and Cold targets that were environmentally conditioned at the specific temperature for 24 hours, prior to ballistic evaluation. The steels used were DH36, EH36, S275 and S355 and the target temperatures were Hot (>+50°C), Ambient (~12°C) and Cold (<- 20°C). The target plates were 10 mm thick. This paper completes the data set for the characterisation of LCS at hot and cold temperatures against AP Ammunition to compare with the previously reported ball ammunition experiments. The experimental set was identical with the shots fired horizontally with a 12m stand-off from the end of a remotely operated gun barrel to the front face of the target plate. The targets were placed inside an ISO container (to prevent wind chill, etc. on the conditioned plate firings) and bounded at the rear with 1 tonne sandbags backed with a large Pendine block wall.


DOI
10.12783/ballistics2019/33176

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