Study on Explosion Equivalent and its Influencing Factors of DT-3 under External Flame Stimulation

To study the explosion equivalent of DT-3 and its influencing factors caused by fire stimulus during storage, transportation and use, the propagate detonation ability of that was studied by the extremely insensitive to detonating substances(EIDS) gap test. High-speed cameras and a shock wave pressure acquisition system were utilized to obtain information on the deflagration processes and shock wave hazards of DT-3 under external flame effect. Additionally, an infrared thermal imager was employed to determine the highest temperature of the surface fireball. Further calculations were conducted to determine the explosive TNT equivalent of 18 kg and 120 kg DT-3 samples. The experimental results indicate that direct exposure to a strong shockwave does not cause DT-3 propagation detonation. However, different packing strengths can lead to deflagration events under external fire conditions, potentially resulting in an overall detonation reaction. The average TNT equivalents for standard packaged 18 kg and 120 kg DT-3 samples were found to be 0.629 and 0.0293 respectively. Furthermore, there is no positive correlation between the scale effect and shock wave impact. Under fire stimulus conditions, package design strength significantly influences the explosive characteristics of DT-3. To enhance safety measures, it is recommended that package design strength be reduced within acceptable limits for actual usage in order to effectively mitigate the risk of detonation hazard.