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reaction degree of composition B explosive with multi-layered compound structure protection subjected to detonation loading

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Defence Technology（防务技术） 2021年第2期17卷 315-326页

作者： Jia-yun Liu Yong-xiang Dong Xuan-yi An Ping Ye Qi-tian Sun Qian Gao State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

The explosive reaction degree and protection from explosions are concerns in the military field.In this work,the reaction degree of the composition B explosive was investigated experimentally.Multi-layered compound structures were used as barriers to weaken the blast loads.A comprehensive experiment using a high-speed camera and image processing techniques,side witness plates,and bottom witness plates was presented.Using the experimental fragment velocities,fragment piercing patterns,and damage characteristics,the reaction degree of the explosive impeded by different multi-layered compound structures could be precisely differentiated.reaction parameters of the explosive obstructed by compound structures were obtained by theoretical analysis and numerical simulations.Unlike the common method in which the explosive reaction degree is only distinguished based on the initial pressure amplitude transmitted into the explosive,a following shock wave reflected from the side steel casing was also considered.Different detonation growth paths in the explosive formed.Therefore,all these shock wave propagation characteristics must be considered to analyze the explosive response impeded by compound structures.

关键词： reaction degree Explosive protection Compound structure Comprehensive experiment

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Combustion crack-network reaction evolution model for highly-confined explosives

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Defence Technology（防务技术） 2023年第8期26卷 54-67页

作者： Zhuo-ping Duan Meng-Jing Bai Zhi-ling Bai Xin-jie Wang Feng-lei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

The evolution behavior of combustion crack reaction of highly confined solid explosives after non-shock ignition is governed by multiple dynamic processes,including intrinsic combustion of explosives,crack propagation,and rapid growth of combustion surface area.Here,the pressure increase can accelerate the combustion rate of explosives,and the crack propagation can enlarge the combustion surface area.The coupling between these two effects leads to the self-enhanced combustion of explosive charge system,which is the key mechanism for the reaction development after ignition.In this study,combustion cracknetwork(CCN) model is established to describe the evolution of combustion crack reaction of highly confined solid explosives after non-shock ignition and quantify the reaction violence.The feasibility of the model is verified by comparing the computational and experimental results.The results reveal that an increase in charge structure size causes an increase in the time of crack pressurization and extension of cracks due to the high temperature-generated gas flow and surface combustion during the initial stage of explosive reaction,but when the casing is fractured,the larger the charge structure,the more violent the late reaction and the larger the charge reaction degree.The input pressure has no obvious influence on the final reaction violence.Further,a larger venting hole area leads to better pressure relief effect,which causes slower pressure growth inside casing.Larger reserved ullage volume causes longer lowpressure induction stage,which further restrains the internal pressure growth.Furthermore,the stronger the casing constraint,the more rapid the self-enhanced combustion of the high temperaturegenerated gas,which results in more violent charge reaction and larger charge reaction degree during casing break.Overall,the proposed model can clarify the effects of intrinsic combustion rate of explosives,charge structure size,input pressure,relief area,ullage volume,and constraint strength on the reaction evolution

关键词： Solid explosives Non-shock ignition Self-enhanced combustion Combustion crack-network(CCN)model Relief area reaction degree

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Comparative Study of reaction degree of Mineral Admixture by Selective dissolution and Image Analysis

Comparative Study of Reaction Degree of Mineral Admixture by...

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中国硅酸盐学会水泥分会第六届学术年会

作者：韩方晖刘娟红阎培渝清华大学土木工程系北京科技大学土木与环境工程学院

The reaction degrees of slag and fly ash in composite binder pastes were comparatively studied by selective dissolution and BSE image analysis.The reaction degree of slag or fly ash determined by selective dissolutions higher than that by image analysis at early age,but the inverse regularity is observed at later age.When the selective dissolution method is used,the reaction degrees of slag and fly ash may be over estimated at early age due to the loss of the superfine particles through the filtration and the partial dissolution of slag or fly ash,and underestimated at later age owing to the presence of cement and hydration products.The narrow reacted slag rims formed at early age cannot be accurately identified during image analysis procedure,which leads to an underestimation of the reaction degree of slag.Due to the destruction of fly ash particles during grinding or polishing process,the reaction degree of fly ash obtained by image analysis is overestimated.At later age,the small particles cannot be fully counted at low magnification and the outer part of particles cannot be calculated at high magnification,and thus high reaction degree may be obtained.BSE image analysis could give more reliable results with acceptable error than selective dissolution.

关键词： slag fly ash reaction degree selective dissolution image analysis

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