Experimental Determination of the Drag Coefficient of Conical Penetrators and a Penetrator with a Flat Front End during Supersonic Motion in Sandy Soil

Герасимов, С. И.; Ерофеев, В. И.; Travov, Yu. F.; Иоилев, А. Г.; Pisetskii, V. V.; Kapinos, S. A.; Kalmykov, A. P.; Lapichev, N. V.

doi:10.1134/s1063784221030087

Cited by 2 publications

(1 citation statement)

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“…Определение закономерностей процессов проникания твердых тел в грунтовые среды актуально, но затруднено по ряду объективных причин [1][2][3][4][5][6][7][8][9][10]. Для расчета большое значение имеют экспериментальные зависимости, которые используются для тестирования или верификации применяемых подходов и моделей для описания процессов проникания [11][12][13][14][15][16][17][18][19][20].…”

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Mechanical Wear of the Penetrator Body During Its Movement in the Ground

Borisov

Gerasimov²,

Ryzhov

et al. 2023

PSP

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One of the most important parameters when choosing the design of the reactor is the contours of the cavitator – its head part and the nature of the material entrainment. During the tests of penetrating elements when embedded in soil barriers, the effect of abrasive wear of the material on the cavitating surface caused by the scratching effect of soil particles was detected. Moreover, the scale of abrasive wear strongly depends on the shape of the head part, for example, a penetrating element with a cavitator with a flat end shows slight wear of the side edges, and a conical cavitator noticeably changes its geometric shape. To estimate the wear of penetrating elements with a conical cavitator, it is proposed to use the J. Archard abrasive wear model. The main difficulty in applying this model leads to the experimental determination of the value of the coefficient characterizing the dependence of the wear rate on the speed. Inside the penetrators, onboard measuring complexes were located that recorded the dependence of acceleration on time on the terradynamic section of the trajectory. After the experiments, the penetrators were removed from the shaft and their residual length was measured. To assess the effect of wear on the terradynamic characteristics of the penetrators, a series of calculations of the parameters of the process of their penetration into the soil barrier for a flat, ogive and conical shape of the tip was carried out. According to the results obtained, taking into account the wear process of the cavitating tip leads to a decrease in the depth and to a more intensive penetration of the penetrator, which is the result of a decrease in the mass of the penetrator during the insertion process and an increase in the diameter of the cavitating cone. As expected, the penetration parameters change most noticeably at a high initial penetration rate.

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