Pressure Load Characteristics of Nonideal Explosives in a Simulation Cabin

Abstract

In this study, an aluminum-containing charge was exploded in an enclosed simulation cabin to explore the characteristics of two types of damaging pressure loads formed by internal explosions: the first incident shock wave and the quasistatic pressure. A high-frequency piezoelectric sensor was used to measure the first incident shock wave and a low-frequency piezoresistive sensor was used to measure the quasistatic pressure. After obtaining effective experimental data, the experimental results were compared with the values obtained by the classical calculation model. The results show that the pressure loads generated by the internal explosions from the ideal explosive and the aluminum-containing explosive share similar load characteristics, given the same mass and benchmark explosive. The difference between the two explosives primarily lies in the amplitude of the load parameters. The aluminum-containing explosive has lower first incident shock wave and higher quasistatic pressure than that of the ideal explosive. For the peak overpressure of the first incident shock wave, the explosion shock wave load parameters of the aluminum-containing explosive, which are calculated based on the explosion heat theory, are higher than the measured values. The peak quasistatic overpressure is directly related to the total energy released by the explosion; however, they are hardly correlated with the reaction process. Therefore, the aerobic postcombustion reaction of the aluminum-containing explosive does not affect the analysis and calculation of the peak quasistatic overpressure. As a result, given the heat value of the explosive, the peak quasistatic overpressure of the explosive can accurately be obtained.

Simplified Algorithm Model for Explosion Shockwave Load in the Cabin

“…e pressure-sensitive surface of the sensor and the inside of the bulkhead were maintained parallel to each other. e nylon tooling and the bulkhead interference were installed together compactly through interference fit [18]. e high-frequency piezoelectric sensor and nylon tooling for experimental use are shown in Figure 2.…”

Research on thermal protection of piezoelectric pressure sensor for shock wave pressure measurement in explosion field

“…Shock wave pressure is one of the important performance indicators for evaluating the damage capability of weapons and ammunition (Hong et al , 2020). Piezoelectric pressure sensors are widely used in shock wave pressure measurement because of their good dynamic characteristics and environmental adaptability (Wang et al , 2019; Feng and Ma, 2020; You and Ding, 2021). However, in a large number of explosion pressure tests, it was found that the missing consideration of the temperature influence on the piezoelectric pressure sensors was one of the main reasons for deviating results and a high variation (Krause et al , 2021).…”

Pressure Load Characteristics of Explosions in an Adjacent Chamber

“…ese research results have made possible the prediction and evaluation of internal explosion pressure load. In terms of mechanisms, studies on reflected shock waves mainly included theoretical calculations of multiple reflection shock waves [14][15][16], local interaction between shock wave and confined space [17][18][19][20], research on quasistatic pressure, mainly the calculation of quasistatic pressure load parameters [21][22][23], effects of postexplosive combustion on quasistatic pressure [24][25][26][27], effects of shape and structure of pressure relief hole on quasistatic pressure [28][29][30][31][32], and internal explosion load characteristics of nonideal explosives [33][34][35]. In contrast to research on single chambers, today's research on the internal explosion pressure load of multichamber structures is inadequate.…”