## 3 Results and Discussion
### Mechanism Analysis of Temperature Effect on Shock Sensitivity of HMX-Based Booster  
The acceptor explosive HMX-based booster is composed of 95% HMX and 5% FPM\({}_{2602}\), of which the main component is HMX; the melting point of HMX is 267\(-\)280 \({}^{\circ}\)C, and the thermal decomposition temperature of HMX is approximately 278 \({}^{\circ}\)C [38]. The results of SSGT show that, in a low-temperature environment, the gap value of the JO-9C detonation booster charge decreases and the shock sensitivity decreases; on the contrary, in a high-temperature environment, the gap value of HMX-based booster detonation booster charge increases, and the shock sensitivity increases. The following is a discussion of different ambient temperatures on the mechanism of HMX-based booster detonating charge shock initiation performance. In a low-temperature environment, the HMX explosive volume of HMX-based booster transmissive charge may contract, resulting in an increase in internal density so that the size of the HMX crystal hole spacer decreases or disappears, making it difficult to form an effective hotspot at this location on the shockwave front [39]. In addition, the column itself is in a low-temperature state, and the conditions for hotspot formation are more demanding than those at room temperature, resulting in the inability of hotspots to form and expand in large numbers inside the column. Therefore, the low-temperature environment of the charge density increases, the crystal cavity reduction and the column of the macroscopic cryogenic effect, so that HMX-based booster in the impact of shock waves cannot generate a large number of hotspots and is easy to extinguish, resulting in a reduction in HMX-based booster detonating charge shock sensitivity. In the existing studies on HMX-based explosives, it is known that the internal pores of the explosive particles, the HMX crystal-binder interface and the HMX crystals encapsulated by the binder are visible when observed at room temperature. When the explosives are heated, the internal pores and interfaces become blurred, indicating that the binder undergoes thermal decomposition and fills the original pores between the interfaces [38; 40; 41; 42]. The fluidity inherent in the binder when heated also increases the irregularity of the arrangement of the HMX crystals, leading to a sharp increase in the number of voids with temperature and a significant increase in the sensitivity to explosives [39]. The heat generated by the decomposition reaction within the explosive is greater than the heat it conducts to the outside, leaving the explosive itself in an unstable state [38] and leading to an increase in sensitivity. The main component of HMX-based booster is HMX, which is known to exist in \(\alpha\), \(\beta\), \(\gamma\) and \(\delta\) as well as phase transitions between them, where \(\beta\)\(\rightarrow\)\(\delta\) may be a phase transition that occurs at certain temperatures or pressures [43]. \(\beta\)-HMX is the most stable state at room temperature and has the maximum energy and density and minimum sensitivity of the HMX crystals. The \(\beta\)\(\rightarrow\)\(\delta\) phase transition significantly improves the effect of HMX explosion sensitivity. And when \(\beta\)-HMX and \(\delta\)-HMX coexist, HMX explosives have greater shock sensitivity [44]. When HMX-based explosives are at 195 \({}^{\circ}\)C, the \(\beta\)\(\rightarrow\)\(\delta\) phase transition may be a key factor in influencing their shock sensitivity [40]. Experiments were carried out to observe the morphology of HMX crystals at different temperatures, and the surface morphology of HMX crystals under the action of external temperatures between 30 \({}^{\circ}\)C and 150 \({}^{\circ}\)C did not change, and no damage occurred; however, when the temperature was increased to 180 \({}^{\circ}\)C, which exceeded the temperature at which the \(\beta\)\(\rightarrow\)\(\delta\) phase transition occurs, the HMX crystals underwent cracking, and some of them were even completely broken.