Propellants, Explosives, Pyrotechnics最新文献_第4页

Contents: Prop., Explos., Pyrotech. 6/2024 内容：Prop.6/2024

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202480611

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Forthcoming Meetings: Prop., Explos., Pyrotech. 6/2024 即将召开的会议：Prop.6/2024

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202480698

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Future Articles: Prop., Explos., Pyrotech. 7/2024 未来文章：Prop.7/2024

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202480699

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Cover Picture: (Prop., Explos., Pyrotech. 6/2024) 封面图片：（道具、爆炸、烟火 6/2024）

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202480601

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Dynamic damage and non‐shock ignition behavior of polymer bonded explosive under lower velocity impact 聚合物粘结炸药在低速冲击下的动态破坏和非冲击点火行为

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202300016

Youcai Xiao, Kelei Pei, Yu Zou, Yong Han, Tianyuan Gong, Xiangdong Xiao, Yi Sun

{"title":"Dynamic damage and non‐shock ignition behavior of polymer bonded explosive under lower velocity impact","authors":"Youcai Xiao, Kelei Pei, Yu Zou, Yong Han, Tianyuan Gong, Xiangdong Xiao, Yi Sun","doi":"10.1002/prep.202300016","DOIUrl":"https://doi.org/10.1002/prep.202300016","url":null,"abstract":"The accidental ignition of polymer‐bonded explosives (PBXs) caused by hot spots has been the focus of domestic and international research. Micro‐crack friction plays a crucial role in the formation these hot spots. In this study, confined tests were conducted to investigate the ignition response of PBX under impact loading. The experimental results revealed that the PBX underwent ignition under the given conditions of a pressure load with a pulse width of 50 μs and an amplitude of 638 MPa. The viscoelastic statistical cracking model (Visco‐SCRAM) and hot‐spot ignition model were used to describe the damage behaviors and ignition responses of the PBX. The simulation results revealed that more severe damage occurs at the center of the impact face and its vicinity under confined impact conditions, which is consistent with the observed post‐test samples. Additionally, simulation results also predict a trapezoidal shape for the severely damaged region within the PBX. The findings of this study provide insights for understanding the damage behavior and the critical ignition of PBX under impact loading.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":"21 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Synthesis of HHTPB by partial hydrogenation of HTPB using copper chromite as a catalyst 以铜铬铁矿为催化剂通过 HTPB 部分氢化合成 HHTPB

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202300339

Ch Devi Vara Prasad, P. Kanakaraju, R. Vinu, Abhijit P. Deshpande

{"title":"Synthesis of HHTPB by partial hydrogenation of HTPB using copper chromite as a catalyst","authors":"Ch Devi Vara Prasad, P. Kanakaraju, R. Vinu, Abhijit P. Deshpande","doi":"10.1002/prep.202300339","DOIUrl":"https://doi.org/10.1002/prep.202300339","url":null,"abstract":"HTPB (hydroxyl‐terminated polybutadiene) is a well‐established binder in the composite solid propellant owing to its excellent compatibility with ammonium perchlorate (AP) and aluminium (Al) particles in giving rise to optimal ballistic and mechanical properties. Efforts are being made to improve the ballistic properties further, such as specific impulse. One way of increasing the specific impulse is to hydrogenate HTPB, which decreases the molecular mass of the combustion product gases. This paper is a summary of efforts in synthesizing hydrogenated HTPB (HHTPB) using copper chromite (CC) as a catalyst. A novel synthesis methodology is developed for HHTPB using a temperature‐programmed batch reactor with a variable speed stirrer and an instrumentation system to maintain the desired liquid reactant temperature. A process cycle is developed that includes addition sequence and reaction time. The product is analyzed using 1H‐NMR and FTIR to estimate the degree of hydrogenation and the geometrical isomers respectively. The estimated apparent equilibrium rate constants from the degree of hydrogenation values are respectively 74 and 2034 L/(mol MPa) for non‐catalyzed and catalyzed systems, indicating the effectiveness of the catalyst. This is also substantiated by the reduction in Gibbs free energy (ΔG), to an extent of 4.48 kJ/mol. Thermogravimetry examination indicates that the decomposition temperature of HHTPB produced by the catalytic method is marginally higher compared to HTPB. DSC curves indicate that the decomposition enthalpy of HHTPB is higher than that of HTPB. In summary, this paper proposed and validated a novel method in the preparation of HHTPB using copper chromite.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":"15 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Investigation of thermal damage in explosive bridgewire detonators via discrete element method simulations 通过离散元法模拟研究爆炸桥丝雷管的热损伤

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-24 DOI: 10.1002/prep.202300305

Ki T. Wolf, Joel T. Clemmer, Michael L. Hobbs, Michael Kaneshige, Dan S. Bolintineanu, Judith A. Brown

{"title":"Investigation of thermal damage in explosive bridgewire detonators via discrete element method simulations","authors":"Ki T. Wolf, Joel T. Clemmer, Michael L. Hobbs, Michael Kaneshige, Dan S. Bolintineanu, Judith A. Brown","doi":"10.1002/prep.202300305","DOIUrl":"https://doi.org/10.1002/prep.202300305","url":null,"abstract":"Exploding bridgewire (EBW) detonators are used to rapidly and reliably initiate energetic reactions by exploding a bridgewire via Joule heating. While the mechanisms of EBW detonators have been studied extensively in nominal conditions, comparatively few studies have addressed thermally damaged detonator operability. We present a mesoscale simulation study of thermal damage in a representative EBW detonator, using discrete element method (DEM) simulations that explicitly account for individual particles in the pressed explosive powder. We use a simplified model of melting, where solid spherical particles undergo uniform shrinking, and fluid dynamics are ignored. The subsequent settling of particles results in the formation of a gap between the solid powder and the bridgewire, which we study under different conditions. In particular, particle cohesion has a significant effect on gap formation and settling behavior, where sufficiently high cohesion leads to coalescence of particles into a free‐standing pellet. This behavior is qualitatively compared to experimental visualization data, and simulations are shown to capture several key changes in pellet shape. We derive a minimum and maximum limit on gap formation during melting using simple geometric arguments. In the absence of cohesion, results agree with the maximum gap size. With increasing cohesion, the gap size decreases, eventually saturating at the minimum limit. We present results for different combinations of interparticle cohesion and detonator orientations with respect to gravity, demonstrating the complex behavior of these systems and the potential for DEM simulations to capture a range of scenarios.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":"228 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research progress and prospects on agglomeration models and simulation methods of aluminum particles in aluminum‐based composite propellants 铝基复合推进剂中铝颗粒的团聚模型和模拟方法的研究进展与展望

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-21 DOI: 10.1002/prep.202400056

Huanhuan Gao, Fang Wang, Hui Liu, Yukun Chen, Jianzhong Liu

{"title":"Research progress and prospects on agglomeration models and simulation methods of aluminum particles in aluminum‐based composite propellants","authors":"Huanhuan Gao, Fang Wang, Hui Liu, Yukun Chen, Jianzhong Liu","doi":"10.1002/prep.202400056","DOIUrl":"https://doi.org/10.1002/prep.202400056","url":null,"abstract":"The agglomeration of aluminum during the combustion of solid propellants considerably impacts engine operation and has been widely studied in recent years. The characteristics of aluminum agglomeration in aluminum‐based composite propellants have been studied via experiments and simulations. In this study, the agglomeration process and the characteristics of agglomerated particles are summarized. Agglomeration models and simulation methods have garnered considerable attention because they are not influenced by experimental conditions, are economical, and have minimal restrictions. Therefore, five agglomeration models and four simulation methods are introduced herein to investigate agglom eration in aluminum‐based composite propellants. By analyzing the advantages and disadvantages of these models and methods, deeper agglomeration mechanisms can be explored and new directions for suppressing agglomeration can be identified to mitigate agglomeration issues. These efforts can support and guide the design of solid rocket propellants and the safe operation of rocket engines.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":"211 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Energetic transition metal complexes based on 1‐allylimidazole and nitrocyanamide: Syntheses, characterizations and catalytic performances on the thermal decomposition of ammonium perchlorate 基于 1-烯丙基咪唑和硝基氰酰胺的高能过渡金属配合物：合成、表征和对高氯酸铵热分解的催化性能

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-21 DOI: 10.1002/prep.202300342

Yuhong Yuan, Yinsheng Huang, Mingcheng Ge, Ye Zhong, Zhimin Li

{"title":"Energetic transition metal complexes based on 1‐allylimidazole and nitrocyanamide: Syntheses, characterizations and catalytic performances on the thermal decomposition of ammonium perchlorate","authors":"Yuhong Yuan, Yinsheng Huang, Mingcheng Ge, Ye Zhong, Zhimin Li","doi":"10.1002/prep.202300342","DOIUrl":"https://doi.org/10.1002/prep.202300342","url":null,"abstract":"To explore combustion catalysts for solid propellants, four novel energetic coordination compounds were prepared with the anion of nitrocyanamide (NCA) as the ligand and 1‐allyl‐imidazole (AIM) as the ligand, and transition metals Mn, Co, Ni, and Cu as the central ions. The structures of these compounds were [Mn(AIM)4] (NCA)2 (1), [Co(AIM)4](NCA)2 (2), [Ni(AIM)4](NCA)2 (3), [Cu(AIM)4](NCA)2 (4). The results showed that all of the compounds possessed high energy density, and compound 2 had a mass energy density (Eg) of 17.9 kJ g−1 and a volume energy density (Ev) of 25.59 kJ cm−3. The catalytic effect of these compounds on the thermal decomposition of ammonium perchlorate (AP) was studied using DSC. The addition of 5 % catalyst to AP samples advanced the high‐temperature decomposition temperature and significantly increased the heat release. Compound 4 exhibited the best catalytic performance, with an increased heat release of 1739 J g−1, decomposition temperature advanced by 88.2 °C, and activation energy reduced to 74.74 kJ mol−1. These results demonstrate the potential of these compounds as combustion catalysts for solid propellants.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":"42 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation and optimized design of a launching system with a novel charge structure 新型装药结构发射系统的数值模拟和优化设计

IF 1.8 4区工程技术

Propellants, Explosives, Pyrotechnics Pub Date : 2024-06-21 DOI: 10.1002/prep.202300326

Zi‐Jun Chen, Hong‐Hao Ma, Qing‐Tao Xu, Ze He, Zhao‐Wu Shen, Lu‐Qing Wang

{"title":"Numerical simulation and optimized design of a launching system with a novel charge structure","authors":"Zi‐Jun Chen, Hong‐Hao Ma, Qing‐Tao Xu, Ze He, Zhao‐Wu Shen, Lu‐Qing Wang","doi":"10.1002/prep.202300326","DOIUrl":"https://doi.org/10.1002/prep.202300326","url":null,"abstract":"In this paper, a launching system with a novel charge structure was proposed to improve the interior ballistic performance. According to the working characteristics of the novel launching system, a lumped‐parameter model was established. The parameters of the propellant and the interior ballistic characteristics of the launching system were obtained by experiments. According to the experimental results, the accuracy of the lumped‐parameter model was verified by code. The simulated results were in good agreement with the experimental results. Based on the lumped‐parameter model, the propellant parameters, such as the impetus, the burning rate, the web thickness, and the charge mass, were investigated to understand the interior ballistic performances of the launching system. An optimization method was proposed to design the propellant parameters of the launching system. The results show that the optimal scheme can increase the velocity of the projectile by 9.54 %. Compared with the traditional launching method, the velocity of the projectile is increased by 37.09 % while the peak pressure in the barrel has no change.","PeriodicalId":20800,"journal":{"name":"Propellants, Explosives, Pyrotechnics","volume":"2012 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141516878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0