Article
Chemistry, Multidisciplinary
Junying Wu, Jiaojiao Wu, Junjian Li, Yiping Shang, Lang Chen
Summary: The thermal decomposition of cyclotrimethylenetrinitramine (RDX) and RDX/hydroxy-terminated polybutadiene (HTPB) mixtures was studied using classical reaction and first-principles molecular dynamics methods. The results showed that the addition of HTPB as a binder significantly reduced the decomposition rate of RDX. However, HTPB had little effect on the initial decomposition mechanism. It was also found that HTPB-chain fragments combined with the RDX decomposition product NO2 to inhibit the formation of N-2 and CO2.
Article
Physics, Multidisciplinary
Yu Zhang, Wenjie Su, Yifan Qin, Wei Jin, Yaxun Zhang, Zhihai Liu, Libo Yuan
Summary: Investigating the thermal decomposition characteristics and mechanisms of nano- and submicron-aluminized 1,3,5-trinitro-1,3,5-triazine (RDX) is essential for optimization of formulations and improvement of combustion/detonation efficiencies. In this paper, we demonstrate an all-fiber probing method for the violent thermal decomposition of a single nano-aluminized micron-RDX particle, referred to as micro-explosion, which contributes to the research of thermal decomposition.
FRONTIERS IN PHYSICS
(2023)
Article
Chemistry, Physical
Pengsong Nie, Shaohua Jin, Xinyu Kou, Lixiaosong Du, Lijie Li, Kun Chen, Yu Chen, Junfeng Wang
Summary: This study investigates the effect of NTO content on the properties of HMX-based cast-PBX through experiments and simulations. The results demonstrate that the addition of NTO reduces the mechanical sensitivity of cast-PBX but decreases its energy level. The mechanical and thermal properties of cast-PBX show an increasing trend followed by a decreasing trend with the increase of NTO content. Moreover, the thermal safety performance of cast-PBX is greatly improved with the increase of NTO content.
Article
Engineering, Aerospace
Weiqiang Xiong, Yunjie Liu, Tianfu Zhang, Shixi Wu, Dawen Zeng, Xiang Guo, Aimin Pang
Summary: Aluminium-lithium alloy (Al-Li alloy) powder has excellent ignition and combustion performance. The combustion product of Al-Li alloy powder combined with ammonium perchlorate is gaseous at the working temperature of solid rocket motors, which greatly reduces the loss of two-phase flow. The effect of the Al-2.5Li (2.5 wt% lithium) content on propellant combustion and agglomeration was thoroughly investigated through various experiments.
Article
Chemistry, Physical
Xiaofeng Yuan, Shuhai Zhang, Ruijun Gou, Ying Huang, Hui Bai, Qianjin Guo
Summary: The study investigated the thermal decomposition mechanism of the NTO/HTPB hybrid system. It was found that the incorporation of HTPB introduced a large amount of H and OH into the system, promoting the thermal decomposition of NTO. The addition of HTPB reduced the activation energy of the system and increased its sensitivity to thermal stimuli.
COMPUTATIONAL AND THEORETICAL CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Xu Zhou, Yaofeng Mao, Dawei Zheng, Lin Zhong, Ruihao Wang, Bing Gao, Dunju Wang
Summary: Researchers are paying increasing attention to the vulnerability of weapons and ammunition, with one potential direction for explosive research and development being to reduce vulnerability through charging structures. The RDX-based high aluminized gradient structure explosives constructed via direct ink writing demonstrate good compatibility and thermal stability, with a significantly increased critical size.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Thermodynamics
Jing An, Ronghui Ju, Jianyou Zeng, Yiming Luo, Hao Luo, Haixia Ma
Summary: This study investigated the effect of thermoplastic polyurethane (TPU) and ethylene-vinyl acetate copolymer (EVA) on the pyrolysis and safety performance of polymer-bonded explosives (PBX) containing energetic materials (EMs). The results showed that TPU increased the activation energy of the EMs and inhibited the pyrolysis process, while EVA improved the thermal stability and ignition performance.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Materials Science, Multidisciplinary
Bing-Xin Liu, Qi-Xuan Du, Shi-Xiong Chen, Jiu-Hou Rui, Da-Bin Liu
Summary: This study investigated the mechanical behavior of high-quality RDX in pressed polymer bonded explosives (PBXs) with different formulations, focusing on compressive strength, shear strength, and tensile strength. Molecular dynamics simulation, scanning electron microscope, and surface energy calculation were used to analyze the effects of smooth, hard particles. The results showed that H-RDX did not contribute positively to the pressed PBXs system, with the decrease in binding force between binders and crystals due to the difficulty in spreading coating agents on H-RDX crystals. The mechanical strengths of H-RDX-based pressed PBXs were weakened, with a reduction in loading capacity of up to 65%.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Thermodynamics
Fateh Chalghoum, Djalal Trache, Mokhtar Benziane, Salim Chelouche
Summary: The potential of lithium aluminum hydride (LiAlH4) as an energetic fuel and chlorine scavenger in composite solid propellants (CSPs) has been studied. The research found that LiAlH4 did not affect the chemical structure of the propellant, but enhanced the heat release and reduced the activation energy.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Polymer Science
Traian Rotariu, Andreea Elena Moldovan, Gabriela Toader, Aurel Diacon, Edina Rusen, Raluca Elena Ginghina, Ovidiu Iorga, Horia Razvan Botis, Thomas Klapoetke
Summary: This paper presents a versatile method for obtaining green PBX formulations based on two high explosives and copolymeric binders. By coating the RDX and HMX crystals, traditional organic solvents are avoided, ensuring safe handling and easy recovery of the energetic materials. The PBX formulations were evaluated using various analytical tools and demonstrated remarkable energetic performances.
Article
Materials Science, Multidisciplinary
Yafei Huang, Xiaoliang Deng, Jingsong Bai
Summary: The bond-based peridynamics modeling is used to study the dynamic damage response of polymer bonded explosive (PBX) confined in spherical steel shells under impact loading. The damage behavior of PBX is influenced by the impact speed, with absence of longitudinal cracks at low impact speed and presence of longitudinal cracks at high impact speed. The effects of external confinement on the dynamic damage response of PBX are analyzed based on stress wave theory, and the Young's modulus of steel shells is found to affect the damage of PBX.
MECHANICS OF MATERIALS
(2022)
Article
Thermodynamics
G. Z. Xu, X. D. Gao, G. -l. Jin, D. Q. Wang, Z. M. Zhang, T. Y. Tan, Y. Qin, J. Liu, F. S. Li
Summary: In this study, the application of micron-size m-RDX and nano-size n-RDX in RDX-PBX was compared. It was found that n-RDX could make the PBX more compact, with a 39.7% increase in strain compared to m-RDX-PBX. The component content of n-RDX-PBX was consistent with the formula, and it exhibited lower sensitivity while maintaining equivalent detonation velocity, pressure, and heat as m-RDX-PBX.
COMBUSTION EXPLOSION AND SHOCK WAVES
(2023)
Article
Engineering, Multidisciplinary
Quan-zhi Xia, Yan-qing Wu, Feng-lei Huang
Summary: This study establishes a numerical model of a PBX three-phase hybrid system and introduces a nonlinear plastic damage cohesion model to investigate the effect of interface behavior on the mechanical properties and damage evolution of PBX under combined tension-shear loading. The parameters in the model were fitted and calibrated, and the effects of interfacial tensile strength and shear strength on the damage process of PBX were studied. Serrated and hemispherical structures of the PBX interface were developed, affecting the damage process and instability during the loading process.
DEFENCE TECHNOLOGY
(2023)
Article
Physics, Applied
Hongfu Wang, Yan Liu, Fan Bai, Fenglei Huang
Summary: The experimental results indicate that as the size of the aluminum powder decreases, the shock sensitivity of aluminized RDX increases, along with the reaction rate and the proportion of aluminum involved in the initiation reaction.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Applied
Vahid Bagheri, Mohammad Hossein Keshavarz, Ali Mousaviazar
Summary: The active aluminum content has a significant effect on the detonation performance of aluminized explosives. Higher content of active aluminum results in higher detonation velocities and increased contribution in the reaction zone. Coating the surface of submicron-sized aluminum reduces oxidation rate and increases the service life.
JOURNAL OF ENERGETIC MATERIALS
(2023)
