Experimental investigation on deflagration to detonation transition of HMX/TNT/AL compositions at fast thermal ignition

ZHAO Shengwei; Zhou Gang; DING Yang; WANG Changli

doi:10.11883/bzycj-2017-0396

Volume 39 Issue 3

Mar. 2019

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ZHAO Shengwei, Zhou Gang, DING Yang, WANG Changli. Experimental investigation on deflagration to detonation transition of HMX/TNT/AL compositions at fast thermal ignition[J]. Explosion And Shock Waves, 2019, 39(3): 032103. doi: 10.11883/bzycj-2017-0396

Citation:

ZHAO Shengwei, Zhou Gang, DING Yang, WANG Changli. Experimental investigation on deflagration to detonation transition of HMX/TNT/AL compositions at fast thermal ignition[J]. Explosion And Shock Waves, 2019, 39(3): 032103. doi: 10.11883/bzycj-2017-0396

Citation:

ZHAO Shengwei, Zhou Gang, DING Yang, WANG Changli. Experimental investigation on deflagration to detonation transition of HMX/TNT/AL compositions at fast thermal ignition[J]. Explosion And Shock Waves, 2019, 39(3): 032103. doi: 10.11883/bzycj-2017-0396

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Experimental investigation on deflagration to detonation transition of HMX/TNT/AL compositions at fast thermal ignition

doi: 10.11883/bzycj-2017-0396

Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China

Received Date: 2017-11-06
Rev Recd Date: 2018-10-11

Available Online: 2019-03-25

Publish Date: 2019-03-01

Abstract

Abstract

Cast HMX/TNT/AL compositions are an aluminized explosive. In the present investigation of the deflagration to detonation transition of the cast HMX/TNT/AL compositions with a metal shell at fast thermal ignition, we constructed an experimental platform of DDT of the explosives with a metal shell at fast thermal ignition, which was composed of an experimental equipment, a pressure testing system and a fiber probe system used in the velocity measure. The experimental equipment was composed of the fast heating equipment, the steel tube and the explosives. The peak temperatures were more than 1 100 °C, the temperature rise ranged from 85 °C/s to 95 °C/s when the steel plates 16 mm chick were heated up by the fast heating equipment. Experiments on DDT of the explosives were conducted in which the cast HMX/TNT/AL compositions in the steel tube was heated up using the fast heating equipment. The velocity of the chemical reaction front was measured by the fiber probe as less than 2 600 m/s. The pressure of the chemical reaction front was measured by the high pressure sensor as approximately 1 GPa. The track of the chemical reaction front was obtained using the fiber history. The vicinity and distance of the shock formation were obtained through the characteristics diagram, showing the distance as more than 850 mm. Comparison was made between the estimated fragment mass values of the models and the measured values, with the latter larger than the former. It was concluded that the state of the chemical reaction on the cast HMX/TNT/AL compositions was not detonation but deflagration. According to the Adams & Pack model and the CJ deflagration model, the distance of the shock formation and the pressure of combustion wave was semi-quantitatively evaluated. The results of the CJ deflagration model was found to be closer to the measured values than the Adams & Pack model.
- fast thermal effect,
- cast HMX/TNT/AL compositions,
- deflagration to detonation,
- thermal response

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References(34)

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