Size Effect of HMX-based Pressed Charges under the Cook-off Condition

DONG Zelin; HU Xueyao; WANG Yixin; ZHAO Dong; XIAO Wei; QU Kepeng

doi:10.19554/j.cnki.1001-3563.2026.11.029

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Packaging Engineering ›› 2026, Vol. 47 ›› Issue (11) : 284-290. DOI: 10.19554/j.cnki.1001-3563.2026.11.029

Equipment Protection

Size Effect of HMX-based Pressed Charges under the Cook-off Condition

DONG Zelin, HU Xueyao, WANG Yixin, ZHAO Dong, XIAO Wei, QU Kepeng^*

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Abstract

The work aims to explore the impact of charge size effect on the cook-off characteristics of pressed charges. Cook-off tests and numerical simulation calculations of different orders of charge were carried out. By conducting cook-off tests of hundred-gram, kilogram and ten-kilogram HMX-based pressed charges, the cook-off response characteristic parameters under different charge scales were obtained. A numerical model of the cook-off of pressed charges was established, and a user-defined function (UDF) was used to describe the self-heating reaction process of the charge, and numerical calculations were carried out on test bombs of different scales based on the Fluent platform. The results showed that under the slow-roasting condition of 3.3 ℃/h, as the charge increased from 100 grams to 10 kilograms, the ignition time of the charge gradually shortened, the ignition position shifted from the center of the charge to the edge area, and the overall response of the test bomb was reduced. The severity of the response was reduced. Analysis shows that the size effect is mainly reflected in the following: as the size of the charge increases, the internal thermal resistance of the charge increases, the heat transferred into the charge per unit volume and unit time gradually decreases, and the proportion of explosive participating in the reaction at the moment of response decreases, which ultimately leads to a weakening of the response intensity of the sample bomb.

Key words

explosion mechanics / HMX-based pressed charge / size effect / response characteristics

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DONG Zelin, HU Xueyao, WANG Yixin, ZHAO Dong, XIAO Wei, QU Kepeng. Size Effect of HMX-based Pressed Charges under the Cook-off Condition[J]. Packaging Engineering. 2026, 47(11): 284-290 https://doi.org/10.19554/j.cnki.1001-3563.2026.11.029

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