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| Accelerated Aging Regulation and Life Evaluation of RDX Based Cast PBX |
| Received:August 27, 2023 Revised:October 07, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.10.012 |
| KeyWord:cast PBX explosives accelerated aging aging regulation aging mechanism lifetime prediction |
| Author | Institution |
| XUChun |
Institute of Chemical Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
| ZHANG Dong-mei |
Xi'an Modern Chemistry Research Institute, Xi'an , China |
| ZHANG Peng |
Institute of Chemical Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
| HAO Xiao-fei |
Institute of Chemical Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
| XIAO Qian |
Institute of Chemical Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
| SUI He-liang |
Institute of Chemical Materials, China Academy of Engineering Physics, Sichuan Mianyang , China |
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| Abstract: |
| The work aims to obtain the accelerated aging law of RDX based cast polymer bonded explosive (PBX), analyze the aging mechanism and key sensitive parameters, and explore the evaluation method of accelerated aging life. Accelerated storage aging tests were carried out at constant temperatures such as 60 ℃, 70 ℃, and 80 ℃ for RDX based cast PBX. Microfocal CT, nuclear magnetic resonance, gas chromatography, and other methods were used to investigate the microporosity rate of cast explosive during the aging process. The variation patterns of structural parameters such as cross-linking density and plasticizer content were compared and analyzed for their aging mechanisms, and further exploration was conducted on the accelerated aging life assessment method. During the accelerated aging process of cast PBX, there would be obvious problems such as increasing porosity, increasing cross-linking density, and decreasing plasticizer. The higher the temperature, the faster the changes in related performance parameters. Considering that a decrease in plasticizer content theoretically lead to an increase in porosity, and that plasticizers had the effect of reducing sensitivity, which had a significant impact on penetration stability. In addition, due to the characterization method of plasticizer content was sample, this article evaluated the lifespan of cast PBX using the Arrhenius model with plasticizer content as a sensitive parameter. RDX based cast PBX exhibits significant changes in porosity, cross-linking density, and plasticizer content during the accelerated aging process, which can be used as sensitive parameters for performance evaluation. In this paper, the plasticizer content is used as the sensitive parameter, and a 10% decrease in plasticizer content is used as the criterion. It is calculated that the service life of RDX based caste PBX is about 14.5 years (25 ℃) and 23.8 years (21 ℃). |
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