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Quantitatively determining the impact of air gap on shock-to-detonation transition in PBXs probed by THz Doppler velocimeter 认领 引用
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作者 Zhao-Hui Zhai Sen-Cheng Zhong +3 位作者 Liang-Hui Du Jiang Li Jing Wang Li-Guo Zhu 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第7期271-279,共9页
An air gap prevents the continuous propagation of detonation waves in polymer-bonded explosives(PBXs).Quantitatively characterizing the evolution of the detonation wave within the explosive after passing through an ai... An air gap prevents the continuous propagation of detonation waves in polymer-bonded explosives(PBXs).Quantitatively characterizing the evolution of the detonation wave within the explosive after passing through an air gap is critical for optimizing explosive performance and safety in engineering applications.In this study,we investigate the initiation and propagation process of shock-to-detonation transition(SDT)in 2,4,6-triamino-1,3,5-trinitrobenzene(TATB)based PBXs under detonation loading conditions with air gaps between donor and acceptor explosives using Terahertz wave Doppler Velocimetry(TDV)techniques.The TDV could continuously track the propagation velocity and displacement history of shock or detonation waves inside the PBXs.Experimental observations revealed the transition from shock to detonation in PBXs after the shock wave traversed the air gap,with quantitative measurements of the transition time(0.18,0.49,0.88,1.81,2.64μs)and position(1.0,2.6,4.4,9.4,13.5 mm)for different air gap widths(adjoined,0.1,0.2,0.44,0.54 mm),as well as the non-transition case(PBXs with 20-mm thickness)with air gap of 0.68 mm.The SDT distance and SDT time acquired by TDV are more sensitive(about 18-fold improvement)than conventional explosive surface state diagnostic methods(which usually gives the arrival time at the HE surface,such as elec-trical or optical probe pins)in characterizing the detonation initiation sensitivity of PBX under air gaps.This work provides valuable insights into understanding the behavior of PBXs under shock loading conditions,particularly in applications involving structural discontinuities.It contributes to the design and safety evaluation of explosive systems by offering a more accurate and detailed characterization of the SDT process. 展开更多
关键词 Shock to detonation transition Polymer-bonded explosives Air gap Terahertz wave Doppler velocimetry
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Investigation of system parameters towards safer impact based shock-to-detonation transition in a novel laser driven flyer plate prototype 认领 引用 被引量：1
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作者 Gonca Saglam Ozkasapoglu Selis Onel 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2024年第9期103-113,共11页
Laser driven flyer plate technology offers improved safety and reliability for detonation of explosives in industrial applications ranging from mining and stone quarrying to the aerospace and defense industries.This s... Laser driven flyer plate technology offers improved safety and reliability for detonation of explosives in industrial applications ranging from mining and stone quarrying to the aerospace and defense industries.This study is based on developing a safer laser driven flyer plate prototype comprised of a laser initiator and a flyer plate subsystem that can be used with secondary explosives.System parameters were optimized to initiate the shock-to-detonation transition(SDT)of a secondary explosive based on the impact created by the flyer plate on the explosive surface.Rupture of the flyer was investigated at the mechanically weakened region located on the interface of these subsystems,where the product gases from the deflagration of the explosive provide the required energy.A bilayer energetic material was used,where the first layer consisted of a pyrotechnic component,zirconium potassium perchlorate(ZPP),for sustaining the ignition by the laser beam and the second layer consisted of an insensitive explosive,cyclotetramethylene-tetranitramine(HMX),for deflagration.A plexiglass interface was used to enfold the energetic material.The focal length of the laser beam from the diode was optimized to provide a homogeneous beam profile with maximum power at the surface of the ZPP.Closed bomb experiments were conducted in an internal volume of 10 cm3 for evaluation of performance.Dependency of the laser driven flyer plate system output on confinement,explosive density,and laser beam power were analyzed.Measurements using a high-speed camera resulted in a flyer velocity of 670±20 m/s that renders the prototype suitable as a laser detonator in applications,where controlled employment of explosives is critical. 展开更多
关键词 Laser driven flyer plate Shock to detonation transition Detonation Secondary explosives Pyrotechnic materials Confinement
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Shock Wave Structure of One-Dimensional Hydro-Elastoplastic Riemann Problem with Elastic-Plastic-Fluid Phase Transition 认领 引用
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作者 Xiao Li Zhijun Shen +1 位作者 Hongping Zhang Gang Xu 《Advances in Applied Mathematics and Mechanics》 SCIE CSCD 2025年第2期580-598,共19页
In this work,the types of shock wave structure for hydro-elastoplastic model under compression are researched.The emphasis focuses on the theory of shock transition in the presence of elastic-plastic-fluid phase trans... In this work,the types of shock wave structure for hydro-elastoplastic model under compression are researched.The emphasis focuses on the theory of shock transition in the presence of elastic-plastic-fluid phase transition.As a result,in addition to the classical three-wave structure,two new shock wave patterns are found with the increase of loading strength.Several numerical tests are presented to verify the existence of the three types of wave structure. 展开更多
关键词 Shock wave structure Hydro-elastoplastic model shock transition
Heat shock protein 70 expression in relation to apoptosis in primary bladder transitional cell carcinoma 认领 引用 被引量：3
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作者 HE Ling-feng GUAN Kao-peng +4 位作者 YE Hai-yun REN Liang YAN Zheng WANG Shen-wu HOU Shu-kun 《Chinese Medical Journal》 SCIE CAS 2005年第24期2093-2096,共4页
Bladder carcinoma is the most common tumor in the urinary system. In 1996, a sampleinvestigation showed that bladder carcinoma, in which more than 90% was mainly primary bladder transitional cell carcinoma （BTCC）, w... Bladder carcinoma is the most common tumor in the urinary system. In 1996, a sampleinvestigation showed that bladder carcinoma, in which more than 90% was mainly primary bladder transitional cell carcinoma （BTCC）, was one of the ten highest mortality malignant tumors in China. Bladder carcinoma represented 2% of all malignant tumors and has the fifth most common malignancy in men in Europe and North America. 展开更多
关键词 heat shock protein 70 apoptosis bladder transitional cell carcinoma
Comparative Study on Two Melting Simulation Methods:Melting Curve of Gold 认领 引用
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作者 刘中利 孙俊生 +2 位作者 李瑞 张修路 蔡灵仓 《Communications in Theoretical Physics》 SCIE CAS CSCD 2016年第5期613-616,共4页
Melting simulation methods are of crucial importance to determining melting temperature of materials efficiently.A high-efficiency melting simulation method saves much simulation time and computational resources.To co... Melting simulation methods are of crucial importance to determining melting temperature of materials efficiently.A high-efficiency melting simulation method saves much simulation time and computational resources.To compare the efficiency of our newly developed shock melting(SM)method with that of the well-established two-phase(TP)method,we calculate the high-pressure melting curve of Au using the two methods based on the optimally selected interatomic potentials.Although we only use 640 atoms to determine the melting temperature of Au in the SM method,the resulting melting curve accords very well with the results from the TP method using much more atoms.Thus,this shows that a much smaller system size in SM method can still achieve a fully converged melting curve compared with the TP method,implying the robustness and efficiency of the SM method. 展开更多
关键词 solid-liquid transition high-pressure molecular dynamics shock wave
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Hugoniot equation of state of olivine and its geodynamic implications 认领 引用
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作者 HUANG Xiao Ge YUAN Xian Hao +2 位作者 CHEN Zu An LIU Fu Sheng BAI Wu Ming 《Science China Earth Sciences》 SCIE EI CAS CSCD 2016年第3期619-625,共7页
Large olivine samples were hot-pressed synthesized for shock wave experiments. The shock wave experiments were carried out at pressure range between 11 and 42 GPa. Shock data on olivine sample yielded a linear relatio... Large olivine samples were hot-pressed synthesized for shock wave experiments. The shock wave experiments were carried out at pressure range between 11 and 42 GPa. Shock data on olivine sample yielded a linear relationship between shock wave velocity D and particle velocity u described by D=3.56(?0.13)+2.57(?0.12)u. The shock temperature is determined by an energy relationship which is approximately 790°C at pressure 28 GPa. Due to low temperature and short experimental duration, we suggest that no phase change occurred in our sample below 30 GPa and olivine persisted well beyond its equilibrium boundary in metastable phase. The densities of metastable olivine are in agreement with the results of static compression. At the depth shallower than 410 km, the densities of metastable olivine are higher than those of the PREM model, facilitating cold slab to sink into the mantle transition zone. However, in entire mantle transition zone, the shock densities are lower than those of the PREM model, hampering cold slab to flow across the "660 km" phase boundary. 展开更多
关键词 Hugonite density Shock temperature Olivine Mantle transition zone
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