Literatura académica sobre el tema "Explosifs pressés"
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Artículos de revistas sobre el tema "Explosifs pressés"
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BELIN, Vladimir y Zdravka MOLLOVA. "INFLUENCE OF THE TYPE OF DONOR CHARGES ON THE DETONATION RATE OF LOW-SENSITIVITY EXPLOSIVES". Sustainable Development of Mountain Territories 13, n.º 1 (27 de marzo de 2021): 112–18. http://dx.doi.org/10.21177/1998-4502-2021-13-1-112-118.
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The article discusses the creation, testing and implementation of new donor charges designed to initiate low-sensitivity explosives. The cast booster donor charges are made entirely of explosives obtained from the disposal of unnecessary ammunition – TNT, RDX and TEN. The donor charges differ from the mass-produced ones, and have a mass of 150 to 900 g. They also have high explosive characteristics: velocity of detonation from 7200 to 7500 m/s, density of 1.6 g/cm3, excellent water resistance and strength. Their initiating ability on low-sensitivity explosives is significantly better than the one of TNT presses. The velocity of detonation of the main charge of a low-sensitivity emulsion explosive initiated with a cast booster is up to 700 m/s higher than when initiated with a TNT presses. It is especially important when building objects in the constrained conditions, at development of mountain territories for decrease in action of shock air waves and elimination of possibility of mountain collapses and landslides In article advantage of use of cast intermediate detonators on safety of explosive works is proved at development of mountain territories. The new design allows an increase in the security of initiating the charges in the boreholes, which allows them to be initiated with two detonators simultaneously.
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Szalay, Andras, Athanasios G. Mamalis, István Zador, Achilleas K. Vortselas y Laszlo Lukacs. "Explosive Metalworking: Experimental and Numerical Modeling Aspects". Materials Science Forum 767 (julio de 2013): 138–43. http://dx.doi.org/10.4028/www.scientific.net/msf.767.138.
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The application of the High Energy Rate Forming (HERF) represents a new paradigm in the field of production of knowledge-based more components materials: furthermore, joining by plastic deformation of the materials is carried out directly, by high speed, high energy shock waves, without using energy transforming equipment as hydraulic presses etc. The energy sources of the HERF processes are either the electrical energy stored in capacitors or chemical energy stored in the high explosives. High explosives can be utilized for many metalworking techniques; however the three main types of explosive metalworking are: Explosive welding and cladding Explosive tubeforming Explosive compaction of powders and granulates. The present work briefly introduces the principles and practices of the three main types of the explosive metalworking techniques mentioned above and discusses aspects of their numerical simulation.
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Utkin, A. V. y V. M. Mochalova. "Nonclassical detonation regimes of pressed and liquid explosives (Review)". Combustion, Explosion, and Shock Waves 51, n.º 1 (enero de 2015): 63–71. http://dx.doi.org/10.1134/s0010508215010062.
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Belmas, R. y J. P. Plotard. "Physical Origin of Hot Spots in Pressed Explosive Compositions". Le Journal de Physique IV 05, n.º C4 (mayo de 1995): C4–61—C4–87. http://dx.doi.org/10.1051/jp4:1995406.
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Ershov, A. P., N. P. Satonkina y G. M. Ivanov. "High-resolution conductivity profile measurements in detonating pressed explosive". Technical Physics Letters 30, n.º 12 (diciembre de 2004): 1048–50. http://dx.doi.org/10.1134/1.1846854.
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Bodden, David, Timothy Suchomel, Ally Lates, Nicholas Anagnost, Matthew Moran y Christopher Taber. "Acute Effects of Ballistic and Non-ballistic Bench Press on Plyometric Push-up Performance". Sports 7, n.º 2 (18 de febrero de 2019): 47. http://dx.doi.org/10.3390/sports7020047.
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The purpose of this study was to examine the effects of a ballistic or non-ballistic concentric-only bench press (COBP) on subsequent plyometric push-up performance. Fourteen resistance trained men completed two separate one-repetition-maximum (1RM) testing sessions followed by three randomized experimental explosive push-up sessions. These sessions combined a heavy concentric bench press with plyometric push-ups. Using a series of 3 × 10 (condition × time) repeated measures ANOVA, comparisons were made between the effects of ballistic and non-ballistic bench presses on performance of plyometric push-ups to investigate push-up performance variables. Compared with the control condition, both ballistic and non-ballistic bench presses produced lower net impulse and take-off velocity data. No differences were found between ballistic and non-ballistic conditions comparing net impulse and take-off velocity. We conclude that the magnitude of loading used in the current investigation may have caused acute fatigue which led to lower push-up performance characteristics. This information can be used to alter loading protocols when designing complexes for the upper body, combining the bench press and plyometric push-ups.
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Castille, C., E. Germain y R. Belmas. "Origine physique des Points chauds dans les compositions explosives pressées au TATB". Propellants, Explosives, Pyrotechnics 17, n.º 5 (octubre de 1992): 249–53. http://dx.doi.org/10.1002/prep.19920170507.
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M., Ismail, Abdel-Kader E. y El-Beih E. "PREPARATION AND TESTING OF PRESSED PBXs FOR EXPLOSIVE REACTIVE ARMORS." International Conference on Chemical and Environmental Engineering 4, n.º 6 (1 de mayo de 2008): 657–66. http://dx.doi.org/10.21608/iccee.2008.38480.
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Azmi, Nor Azmaliana, Ahmad Humaizi Hilmi, M. Alias Yusof y Ariffin Ismail. "Characteristics of Iron powder when Pressed using Explosive Pressing method". IOP Conference Series: Materials Science and Engineering 429 (9 de noviembre de 2018): 012095. http://dx.doi.org/10.1088/1757-899x/429/1/012095.
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Kim, Hyoun-Soo y Bang-Sam Park. "Characteristics of the Insensitive Pressed Plastic Bonded Explosive, DXD-59". Propellants, Explosives, Pyrotechnics 24, n.º 4 (agosto de 1999): 217–20. http://dx.doi.org/10.1002/(sici)1521-4087(199908)24:4<217::aid-prep217>3.0.co;2-a.
Texto completoTesis sobre el tema "Explosifs pressés"
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Plassart, Gaétane. "Comportement mécanique anisotrope induit des explosifs comprimés". Electronic Thesis or Diss., Bourges, INSA Centre Val de Loire, 2020. http://www.theses.fr/2020ISAB0003.
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Cette étude porte sur la caractérisation et la modélisation du comportement thermomécanique quasistatique d’un explosif comprimé appelé M2. Tout d’abord, un état de l’art de la caractérisation des explosifs comprimés est dressé et les modèles développés pour ces matériaux sont étudiés. Les données expérimentales disponibles sur M2 étant limitées, une campagne est engagée afin de caractériser le comportement quasistatique de ce matériau composite agrégataire. De nombreux chargements sont réalisés à différentes vitesses, pressions et températures. Les réponses expérimentales mettent en évidence un comportement viscoélastique endommageable et une anisotropie induite par l’écoulement plastique. Les modèles définis pour les explosifs comprimés ne sont pas appropriés pour décrire ce comportement. Un modèle tenant compte des mécanismes observés est alors formulé. La viscoélasticité est intégrée à un modèle microplan permettant la description de l’endommagement anisotrope et de son effectivité. Une viscoplasticité multicouche est formulée pour décrire l’écrouissage cinématique non linéaire. Le critère de plasticité de chaque surface est de type von Mises. Une dilatance décrit l’écoulement volumique. La loi de comportement est implémentée dans le code aux éléments finis Abaqus/Standard sous la forme d’une routine utilisateur. Le modèle, qui comporte plus de cinquante paramètres, est identifié sur M2 à partir de dix essais. Soixante simulations sont ensuite réalisées pour confronter le modèle à tous les essais. À quelques exceptions près, le modèle reproduit correctement le comportement de M2. Des pistes de réflexion sont ouvertes pour optimiser l’algorithme. Enfin, l’application du modèle à d’autres explosifs comprimés est mise en question. Le comportement d’un second matériau énergétique agrégataire est analysé. Des simulations prospectives indiquent qu’un travail sur les fonctions d’effectivité est nécessaire avant de pouvoir généraliser le modèleThe characterization and modeling of the quasistatic thermomechanical behaviour of a plastic-bonded explosive (PBX) called M2 is the focus of this study. First, a state of the art of the characterization of PBXs is compiled. The models developed for these materials are presented. Few data being available on M2, an experimental campaign is then performed in order to characterize the quasistatic behaviour of this aggregate composite material. Many different loadings are carried out at different strain rates, pressures and temperatures. Experimental data highlight a viscoelastic behaviour subject to damage and an anisotropy induced by plastic flow. The models for PBXs are not appropriate to describe this behavior. A model accounting for the observed mechanisms is then formulated. The viscoelasticity is integrated in a microplane model describing an effective anisotropic damage. Amultilayer viscoplasticity describes a non-linear kinematic strain-hardening. A von Mises yield criterion is defined on each surface and a dilatancy function describes the volumetric plastic yield. This behaviour law is implemented in the Abaqus/Standard finite element code in the form of a user routine. The model, which contains more than fifty parameters, is identified on M2 from ten tests. Sixty simulations are then carried out to compare the model to each test. The model correctly reproduces the M2 behavior, with just few exceptions. Some ideas to optimize the algorithm are exposed. Finally, the applicability of the model to other PBXs is questioned. The behaviour of a second aggregate energetic material is analyzed. Prospective simulations indicate that the effectivity functions need to be worked on before the model can be generalized to PBXs
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Rosenhaim, Vitor Luconi. "Influência dos níveis de vibração e pressão acústica produzidos pelo desmonte de rochas com explosivos em construções de alvenaria". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/153222.
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Desmonte de rochas com explosivos em áreas próximas a residenciais têm ocorrido com frequência em várias localidades em todo o Brasil. Atividades relacionadas a mineração e em especial as detonações causam muitos problemas visto que geram incômodo às comunidades vizinhas resultante de níveis elevados de pressão acústica (ruído) na atmosfera e reclamações de rachaduras em paredes das residências associadas com a propagação de vibrações no terreno. A necessidade de se obter uma melhor compreensão de como estruturas típicas da construção civil nacional respondem as vibrações geradas pelas detonações se torna evidente, bem como uma avaliação conjunta da influência de outras forças, tais como, condições meteorológicas (variações diárias de temperatura e umidade relativa do ar) que começam a agir sobre os materiais constituintes das estruturas desde o momento da construção e durante toda sua vida útil. Nesse contexto, definiu-se como meta dessa pesquisa investigar a resposta deformacional de construções de alvenaria frente aos estímulos provocados por diferentes níveis de vibração e pressão acústica gerados pelo desmonte de rochas com explosivos em diferentes condições geológicas, comparando-as com os efeitos das variações climáticas de temperatura e umidade. Visando o atendimento desta demanda, a resposta de três estruturas, duas residenciais e uma comercial, a diferentes operações com desmonte de rochas (mineração de carvão e pedreira) foram avaliadas. A movimentação das paredes de estruturas de alvenaria, comumente encontradas no entorno de empreendimentos mineiros, foi registrada com sensores de velocidade instalados nas paredes e os resultados foram correlacionados com os níveis de vibração no terreno e pressão acústica (ruído) na atmosfera que provocaram esta movimentação. A partir dos resultados das medições da movimentação das estruturas, deformações induzidas nas paredes, geradas durante trações no plano e flexões fora do plano das paredes, foram computadas e comparadas com os limites de ruptura do material mais fraco que constitui as paredes das estruturas. Em conjunto com o monitoramento da movimentação das estruturas, variações na abertura de rachaduras existentes no reboco no interior ou exterior das estruturas induzidas por forças dinâmicas (detonações) e estática (variações climáticas) foram registradas por meio de sensores de deslocamento instalados em ambos lados das rachaduras. As respostas das estruturas apresentaram excelente acoplamento da fundação com o terreno e nenhuma movimentação livre (ressonância) das paredes das estruturas foi observada após a passagem das ondas sísmicas, indicando que as estruturas seguem muito perto as excitações provocadas pelas vibrações no terreno do terreno e param de movimentar junto com o mesmo. Devido às ondas sísmicas e acústicas atingirem quase que ao mesmo tempo as estruturas, foi difícil separar a influência de cada estímulo. As deformações calculadas foram inferiores as necessárias para induzir rachaduras na argamassa utilizada como reboco nas paredes, considerada como o material mais frágil dentre os constituintes das paredes das estruturas. A resposta deformacional das rachaduras frente às variações climáticas diárias de temperatura e humidade relativa do ar foi superior as variações resultantes da influência das vibrações geradas pelas detonações.Blasting near residential areas has become frequent in many locations throughout Brazil. Activities related to mining and in especial blasting have become a problem as they generate a potential nuisance to nearby communities resulting from high air sound pressure levels and can result in claims of wall cracking associated with ground vibrations. It was deemed necessary to have a better understanding of how structures of typical national construction respond to blast vibrations and compare this response to other forces, such as, environmental forces that naturally act on these structures since the moment they are constructed and throughout the entire life of the structure. The response of three structures, two residential and one office building, to different blasting activities (coal and quarry blasting) were evaluated in this study. Whole structure motions and the movement of existing cracks were measured in masonry built structures commonly found near mining operations. Whole structure and mid-wall motions were measured at upper and lower corners and on mid-walls using single-axis velocity transducers and compared with ground motions and air sound pressure excitations, measured next to the structures using a tri-axial geophone and microphone. Dynamic (blast-induced) and static (weather-induced) changes in crack width of existing interior and exterior wall cracks in the cement grout, typically used as wall coverage, were recorded. Dynamic structure and crack motions during blasting were time-correlated with ground vibrations and air sound pressure levels. Wall strains generated during out-of plane bending and in-plane tensile strains were computed and compared with the failure strains for the weakest material comprising the wall construction. Long-term crack movement with variations in temperature and humidity were compared with blast-induce peak crack displacements. The structures response showed good coupling of the foundations with the ground and no free-response was observed after the cessations of the ground excitations, indicating the structures are rigid following very close the ground excitation. Because air sound pressure levels and ground motions arrived at the same time in the structures, it was difficult to separate the influence of each stimulus. Calculated strains were lower than the required to induce cracks in the cement grout and environmental-induced crack response, resultant from daily changes in temperature and humidity, were greater than the response caused by blast-induced ground motions and air sound pressure levels in crack aperture.
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Söderberg, Tobias. "Effekter av Post Activation Potentiation inför explosiva träningspass inriktade på styrka och effektutveckling hos elitjuniorer". Thesis, Umeå universitet, Idrottsmedicin, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-153871.
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Power has been proven to be an important factor for sport performance, especially in sports where accelerations, decelerations, jumping or throwing are of great importance. Post activation potentiation (PAP) induced by heavy exercise has been reported as an acute and effective method in improving individuals’ power output. The purpose of this study was to investigate the effects of PAP during warm up on strength and power among elite junior athletes. Methods; 12 elite junior athletes from Kuortane sports gymnasium, Finland, participated in this study. Participants were allocated in two groups (Intervention’s and Control group) in a counterbalanced order. All participants performed a 1RM bench press test and a power-velocity test pre and post a 6-weeks training period. During the training period performed Intervention’s group 2 sets of 3 reps benchpress at 90% of 1RM during the warm up of each strength training session, while Control group performed the same supplement at the end of the strength training sessions. Results:Results didn’t show any significant increases in 1RM bench press for either the intervention’s group or the control group. There were no significant increases observed in the power velocity test in any of the test groups either. 35% 1RM (C= -9, I= +45, P=0,13), 45% 1RM (C= +10, I= +25, P=0,57), 55% 1RM (C= -25, I= +36, P=0,008), 65% 1RM (C= -1, I= +40, P=0,26) samt 75% 1RM (C= -18, I= +30, P=0,14). (Watt, mean value) Discussion:1RM and power velocity did not differ significantly neither between groups nor in the pre vs. post measurements. Intervention’s group showed a larger improvement in power-velocity on 55% of 1RM compared to the control group but the effect size was rather low and therefore no significant conclusions can be drawn. Statistics have clearly shown that larger testing groups or/and a longer training period are needed in order to test the PAP hypothesis.Power är en fysisk faktor som är viktig för prestation i de flesta idrotter, framförallt där aktioner i form av hopp, kast och accelerationer är väsentliga. Post activation potentiation (PAP) har i ett flertal studier visat sig kunna förbättra effektutvecklingen i musklerna under en kortare tid hos tränade individer. Syftet med denna studie var att undersöka om det genom applicering av PAP i uppvärmning inför styrketräningen går att förbättra utfallet av styrka och powerökning hos elit juniorer. Metod: 12 Elitidrottsjuniorer från Kuortane idrottsgymnasiet, Finland deltog i studien. Deltagarna delades upp i två grupper (en interventions- och en kontrollgrupp) och de fick utföra ett 1RM bänkpress test samt power-velocitytest före och efter en träningsperiod på 6 veckor. Interventionsgruppen utförde två set bänkpress med 3 reps på 90% av 1RM inför varje styrkepass, medan kontrollgruppen utförde en likadan intervention vid slutet av varje styrkepass. Statistiska analyser genomfördes genom two way ANOVA. Resultat: Resultatet visade ingen signifikant ökning i 1RM bänkpress i varken interventionsgruppen eller kontrollgruppen. Det visade heller ingen signifikant förbättring på någon av belastningarna i power-velocitytestet. 35% av 1RM (K= -9, I= +45, P=0,13), 45% av 1RM (K= +10, I= +25, P=0,57), 55% av 1RM (K= -25, I= +36, P=0,008), 65% av 1RM (K= -1, I= +40, P=0,26) samt 75% av 1RM (K= -18, I= +30, P=0,14). (Watt, medelvärde) Diskussion: Studien visade ingen signifikant förändring mellan före och eftertesterna mellan de två testgrupperna, varken i 1RM testet eller power-velocitytestet efter de 6 träningsveckorna. Interventionsgruppen visade en större ökning än kontrollgruppen i power-velocitytestet på 55% av 1RM men eftersom effect size är så låg kan resultaten inte anses som signifikanta. Statistiken visar att större testgrupper och/eller längre träningsperiod behövs för att PAP hypotesen skall kunna testas.
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Бондаренко, Тамара Степановна, Людмила Антоновна Васьковец y Олег Ярославович Питак. "Противопожарные и противовзрывные мероприятия в гальванических цехах машиностроительных предприятий". Thesis, Національний технічний університет "Харківський політехнічний інститут", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/40865.
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Обеспечение пожаровзрывобезопасности в гальванических цехах осуществляется путем применения вентиляторов антикоррозионного и взрывоизоляционного исполнения. Предусматриваются также устройства для отвода зарядов статического электричества.
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Silva, Wilson Carlos Lopes. "Blast - efeitos da onda de choque no ser humano e nas estruturas". Instituto Tecnológico de Aeronáutica, 2007. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=467.
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A detonação de um explosivo resulta na produção e violenta liberação de gases comprimidos. A energia produzida propaga-se rapidamente através do meio (ar ou água), provocando variações de pressão, formando uma onda explosiva, que se propaga com velocidade superior a do som. Esta frente de onda, com elevada pressão dinâmica e velocidade supersônica, é conhecida como onda de choque que confere a detonação um enorme poder de ruptura. O efeito terminal desta onda de choque é denominado Sopro ou "Blast Effect". Este trabalho estuda o efeito de sopro gerado por uma onda de choque sobre pessoas e estruturas, descreve os danos causados ao corpo humano pelo aumento brusco e repentino da pressão atmosférica, define distâncias de segurança para proteção de pessoal contra o efeito de sopro e a relação entre pressão de detonação e massa de explosivo, visando otimizar a quantidade de explosivos, bem como a sua distância ao alvo estrutural que se pretende neutralizar. Através de métodos e equações matemáticas, pode-se calcular a pressão gerada pela onda de choque resultante da detonação de certa quantidade de explosivo químico, a uma determinada distância do foco. Dados experimentais relativos aos limites suportados pelo homem e por determinadas estruturas são disponíveis na literatura. Assim, aliando-se as bases teórica e experimental, é possível, com o relacionamento desses parâmetros, elaborar tabelas dinâmicas em planilhas eletrônicas, gerando gráficos de rápida leitura que possam auxiliar a tomada de decisões de profissionais que lidam com o efeito de sopro causado pela detonação de artefatos explosivos militares ou improvisados, visando estabelecer procedimentos para a proteção de pessoas e bens materiais, ou a provocação de danos em um alvo específico.
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Crytzer, Sarah. "Comparing media coverage of the Gulf oil spill in the US and UK implications for global crisis communication". Master's thesis, University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4877.
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The following research is a content analysis of 114 articles written by the American and British news media outlets in the first month following the BP Gulf oil spill in April 2010. The goal of the research was to identify any dominant frames evident in the reports and to compare the two countries to see if there was a difference in the dominant frames used. Positive, negative, and neutral tones were also evaluated to determine if there was a difference between the countries. The results show that both countries reports predominantly used an ecology and action frame, while British media outlets also used an economic frame. Both countries reported with primarily a negative and neutral tone. The implications of these findings for crisis communication managers are discussed.ID: 030423416; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Error in paging: p. v is followed by p. iv i.e. vi].; Thesis (M.A.)--University of Central Florida, 2011.; Includes bibliographical references (p. 47-54).
M.A.
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Sciences
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Oliveira, Marta Filipa Machado Vilela de. "Estudo da influência da composição elementar de lamas de ETAR na pressão de explosão e rácio crescimento da pressão/tempo". Master's thesis, 2020. http://hdl.handle.net/10316/93904.
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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e TecnologiaEste trabalho tem como objetivo a determinação experimental das características de explosividade das lamas provenientes de Estações de Tratamento de Águas Residuais de Portugal (ETAR), de forma a minimizar os possíveis riscos associados a explosões durante o armazenamento, tratamento e transporte destas.Os ensaios experimentais foram efetuados numa câmara de explosão fechada, esférica e com capacidade de 23.9 l, sendo a ignição da explosão gerada por ignidores pirotécnicos de 10 kJ.Inicialmente o pó das lamas é colocado num recipiente de 0.76 l, que é pressurizado a 20 bar e, após a abertura rápida de uma electroválvula, forma-se a suspensão de poeiras no interior da câmara de explosão. De seguida, na câmara de explosão, é efetuada a ignição através de uma descarga elétrica sobre os ignidores pirotécnicos que provocará o início da explosão, de forma a analisar as características de explosividade das lamas.O trabalho experimental iniciou-se com um estudo da avaliação dos parâmetros de explosividade em função do tempo, ou seja, pressões e velocidades de aumento de pressões máximas.Realizaram-se ensaios em que se variou a concentração de poeiras em suspensão de 125 g/m^3, 250 g/m^3 e 750 g/m^3 de forma a determinar a pressão e velocidade máxima de aumento de pressão de explosão máximas para diferentes concentrações de lamas de ETAR. Deste estudo obtiveram-se como valores máximos de pressão e velocidade máxima de aumento de pressão, 1.8 bar e 0.285 bar/ms para uma concentração de 125 g/m^3, 5.3 bar e 0.506 bar/ms para uma concentração de 250 g/m^3 e, por último, 6.3 bar e 0.412 bar/ms para uma concentração de 750 g/m^3.Concluiu-se que um aumento da concentração provocará um aumento da pressão de explosão máxima. Quanto à velocidade máxima de aumento de pressão de explosão, não se verifica o mesmo, sendo que, em certos casos, foi observada uma diminuição da mesma, com o aumento dos valores de concentração.
This paper aims to reach the experimental determination of the explosibility characteristics of dust clouds, performed using sludge from Wastewater Treatment Plants of Portugal, to minimize possible risks associated with explosions during its storage, treatment and transportation.This work was done in a closed explosion spherical vessel with 23.9 l, and the ignition is generated by pyrotechnic ignitors of 10 kJ.Initially, the sludge powder is placed in a dust container of 0,76 l, which is pressurized at 20 bar and, after the fast opening of an electric valve, the dust suspension is formed, inside the explosion vessel. Then, inside the explosion vessel, the ignition is done by an electrical discharge on a pyrotechnic igniter, starting the explosion, in order to analyze the sludge explosivity’s characteristics. The experimental work began with a study about the evaluation of the explosibility parameters as a function of time, meaning there was a relation between pressure and the maximum pressure increase rate.Tests were done by variating the concentration of dust in suspension, using 125 g/m^3, 250 g/m^3 and 750 g/m^3in order to determine pressure and the explosion’s maximum pressure increase rate, for different sludge concentration values.The experimental work ended with the determination of the maximum pressure and the maximum rate of pressure increase values, 1.8 bar and 0.285 bar/ms, for a concentration of 125 g/m^3, 5.3 bar e 0.506 bar/ms for a concentration of 250 g/m^3 and, lastly, 6.3 bar e 0.412 bar/ms for a concentration of 750 g/m^3.With these results, it is possible to assume that the increase of concentration will cause an increase of the maximum explosion pressure. But the same cannot be assumed with the maximum rate of explosion pressure increase, since, in some cases, here is a decrease in this parameter, with the increase of concentration.
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Quaresma, Joana Filipa Pires d'Oliveira. "Optical fiber metrology for detonation characterization of energetic materials". Doctoral thesis, 2021. http://hdl.handle.net/10316/96424.
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Tese no âmbito do doutoramento em Engenharia Mecânica, ramo Aerodinâmica, Riscos Naturais e Tecnológicos orientada pelos Professores Doutores José Leandro Simões de Andrade Campos e Ricardo António Lopes Mendes e apresentada ao Departamento de Engenharia Mecânica da Faculdade de Ciências e Tecnologia da Universidade de Coimbra.Detonation metrology is essential for the development of energetic materials, to characterize existing explosives, and to characterize materials behavior under high pressures. This work aimed to develop detonation metrology based on optical fibers that is independent of the radiation generated from the detonation and/or shock process, as well as based on a light converting system that is not expensive and which signals are easy to read. To achieve these objectives, multimode PMMA optical fibers (250 μm diameter) working as bare probes or protected probes, with stainless steel tubes, were tested. Two working methods, in terms of radiation generation, were applied and discussed. In the optical passive method (OPM), the optical fiber probes capture the radiation generated by the detonation/shock process, originating a positive electrical signal. The optical active method (OAM) consists of transmitting laser radiation (660 nm) through the optical fiber probes that lose their transmission properties when shocked by a detonation or shock wave, which originate negative electrical signals. The different probes and methods were used to determine detonation velocity and pressure of Seismoplast, a PETN-based explosive with a density of 1.56 g/cm3. The different methods and probes were extensively studied to determine their limitations. These limitations make that different probes have to be used on the OAM, according to the parameter that is desired to measure and to the shape of the charge. To find the PCJ, the movements x(t) of the shock waves generated by the detonation of Seismoplast in three inert materials were characterized. With the explosive/inert material interface shock velocities were possible to find the pressures and particle velocities and, through the impedance matching technique (IMT) it was determined the CJ pressure of Seismoplast. For rectangular cross-section charges using the OPM with the two different probes, the detonation velocities obtained ranged from 7237 to 7336 m/s, with standard deviations between 1.1 and 6.0 %; for the active optical method, the experimental results for detonation velocity varied between 7258 and 7367 m/s and were obtained with a standard deviation range of 0.6 to 1.7 %.The OAM with bare optical probes was used to measure the induced shock wave velocities generated by Seismoplast on different thicknesses of PMMA (1–9 mm), aluminum, and copper (1–7 mm). Based on the shock wave velocities at the interfaces between the explosive and the inert barriers, the CJ pressure of Seismoplast was determined as 21.2 GPa. Based on the CJ point (PCJ, uP, CJ) and an empirical method proposed by Cooper, it was possible to estimate the Hugoniot of detonation products of Seismoplast. The OAM, with bare and protected optical probes, was used to determine the detonation velocity of two other compositions, HWC (based on RDX) with a density of 1.68 g/cm3, and TKX-50, an energetic ionic salt with a density of 1.70 g/cm3. This method with bare optical probes was also used to estimate the detonation pressure of TKX-50.
A metrologia da detonação é essencial para o desenvolvimento de materiais energéticos, para a caracterização dos explosivos existentes, e para caracterizar o comportamento dos materiais sobre altas pressões. Este trabalho teve como objectivo desenvolver uma metrologia de detonação baseada em fibras ópticas que é independente da radiação gerada pelo processo de detonação/choque, e que incorpora um conjunto de componentes para o sistema de conversão optoeléctrico relativamente simples. As sondas utilizadas nesta metrologia são baseadas em fibras ópticas multimode de PMMA (250 μm de diâmetro). Estas sondas consistiram em fibras ópticas desprotegidas, ou protegidas com tubos de aço inox. Foram aplicados e discutidos dois métodos de funcionamento desta metrologia, em termos da radiação gerada. No método óptico passivo (MOP), as sondas de fibra óptica capturam a radiação gerada pelo processo de detonação/choque, dando origem a um sinal eléctrico positivo. O método óptico activo (MOA) consiste na transmissão de radiação laser (660 nm) através das sondas de fibra óptica, as quais perdem a capacidade de transmissão quando são chocadas por uma onda de detonação ou de choque, originando sinais eléctricos negativos. Os métodos foram testados na determinação da velocidade (D) e pressão (PCJ) de detonação do Seismoplast, um explosivo baseado em PETN com densidade de 1.56 g/cm3. Os diferentes métodos e sondas foram estudados intensivamente para determinar as suas limitações, as quais fazem com que tenham de ser usadas sondas diferentes no MOA, de acordo com o parâmetro que é desejado medir. Para determinar a PCJ foi necessário caracterizar o movimento x(t) da onda de choque gerada pela detonação do Seismoplast em três materiais inertes diferentes. Com as velocidades de choque nas interfaces explosivo/material inerte foi possível calcular as respectivas pressões e velocidades do ponto material e, através da técnica de adaptação de impedâncias, obteve-se a pressão de CJ do Seismoplast. Quando se utilizou o MOP em cargas de secção rectangular com os dois tipos diferentes de sondas, as velocidades de detonação medidas variaram entre 7237 to 7336 m/s, com desvios padrões entre 1.1 e 6%; para o MOA, os resultados experimentais da velocidade de detonação variaram entre 7258 e 7367 m/s, com desvios padrões a variar entre 0.6 e 1.7%. O MOA com sondas de fibras ópticas desprotegidas foi utilizado para determinar a velocidade da onda de choque induzida pelo Seismoplast em função das espessuras de PMMA, alumínio e cobre. Com base nas velocidades da onda de choque calculadas nas interfaces explosivo/barreira inerte, o resultado para a pressão de CJ do Seismoplast foi de 21.2 GPa. A partir da determinação do ponto de CJ (PCJ, uP, CJ) e do método empírico proposto por Cooper, foi possível estimar a curva de Hugoniot para os produtos de detonação do Seismoplast. O MOA, com sondas de fibras ópticas desprotegidas e protegidas, foi utilizado para determinar a velocidade de detonação de outras duas composições, HWC (baseado em RDX) com densidade 1.68 g/cm3, e TKX-50, um sal iónico energético com densidade 1.70 g/cm3. Este método também foi utilizado, com sondas ópticas desprotegidas, para estimar a pressão de detonação do TKX-50.
Fraunhofer Institute for Chemical Technology
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Pfeifer, Jan. "Silová tonizace v softballu žen". Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-447478.
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Title: The force toning in women's softball Objectives: The aim of this study was to demonstrate post-activation potentiation (PAP) following the muscle toning during the strenght training. The toning effect on upper limb explosive force was analyzed following application of two different degrees of resistence. Methods: In this study, we applied randomized selection for the subject to minimize the effect of possible ambiguities such as gender, training status, and player maturity. A homo- -geneous group of well-trained women with the most developed technical response was accepted. (Czech national team, Women's softball). We used the contrast method, where the data were analyzed to determine the effect of different resistance degrees and a fixed rest interval for the strength-dynamic exercise. It is a sticking out of medicine ball in sitting position, which was performed by women of the highest player level. The measurement was processed by using the direct method of dynamic efforts. We compared the explosive force with a medicine ball sticking forward in relation to the distance of the sticking medicine ball by the tested person. Results: The measurement has shown that the PAP generated by toning protocol has a sig- -nificant impact on enhancing the response in explosive drills. The exercise for...
Libros sobre el tema "Explosifs pressés"
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Mathes, Rainer. Kommunikation in der Krise: Autopsie eines Medienereignisses : das Grubenunglück in Borken. Frankfurt am Main: Institut für Medienentwicklung und Kommunikation, 1991.
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Hussain, Nazir. The role of media in national security: A case study of 1998 nuclear explosions by Pakistan. Editado por Sultan Maria y South Asian Strategic Stability Institute. Islamabad: South Asian Strategic Stability Institute, 2008.
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What is happening to news: The information explosion and the crisis in journalism. Chicago: The University of Chicago Press, 2010.
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We interrupt this broadcast: The events that stopped our lives-- from the Hindenburg explosion to the Virginia Tech shooting. Naperville, Ill: Sourcebooks MediaFusion, 2008.
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Garner, Joe. We interrupt this broadcast: The events that stopped our lives-- : from the Hindenburg explosion to the death of John F. Kennedy Jr. 2a ed. Naperville, Ill: Sourcebooks, 2000.
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Garner, Joe. We Interrupt This Broadcast: The Events That Stopped Our Lives...from the Hindenburg Explosion to the Attacks of September 11. 3a ed. Sourcebooks Mediafusion, 2002.
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Shackelford, Scott J. The Internet of Things. Oxford University Press, 2020. http://dx.doi.org/10.1093/wentk/9780190943813.001.0001.
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The Internet of Things (IoT) is the notion that nearly everything we use, from gym shorts to streetlights, will soon be connected to the Internet; the Internet of Everything (IoE) encompasses not just objects, but the social connections, data, and processes that the IoT makes possible. Industry and financial analysts have predicted that the number of Internet-enabled devices will increase from 11 billion to upwards of 75 billion by 2020. Regardless of the number, the end result looks to be a mind-boggling explosion in Internet connected stuff. Yet, there has been relatively little attention paid to how we should go about regulating smart devices, and still less about how cybersecurity should be enhanced. Similarly, now that everything from refrigerators to stock exchanges can be connected to a ubiquitous Internet, how can we better safeguard privacy across networks and borders? Will security scale along with this increasingly crowded field? Or, will a combination of perverse incentives, increasing complexity, and new problems derail progress and exacerbate cyber insecurity? For all the press that such questions have received, the Internet of Everything remains a topic little understood or appreciated by the public. This volume demystifies our increasingly “smart” world, and unpacks many of the outstanding security, privacy, ethical, and policy challenges and opportunities represented by the IoE. Scott J. Shackelford provides real-world examples and straightforward discussion about how the IoE is impacting our lives, companies, and nations, and explain how it is increasingly shaping the international community in the twenty-first century. Are there any downsides of your phone being able to unlock your front door, start your car, and control your thermostat? Is your smart speaker always listening? How are other countries dealing with these issues? This book answers these questions, and more, along with offering practical guidance for how you can join the effort to help build an Internet of Everything that is as secure, private, efficient, and fun as possible.
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Christian, Donnell R. Forensic Investigation of Clandestine Laboratories. Taylor & Francis Group, 2022.
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Christian, Donnell R. Forensic Investigation of Clandestine Laboratories. Taylor & Francis Group, 2022.
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Forensic Investigation of Clandestine Laboratories. CRC, 2003.
Buscar texto completoCapítulos de libros sobre el tema "Explosifs pressés"
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Tasker, Douglas G. y Richard J. Lee. "High Current Electrical Conduction of Pressed Condensed Detonating Explosives". En Shock Waves in Condensed Matter, 923–28. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2207-8_136.
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Suny, Ronald Grigor. "Since the Centennial: New Departures in the Scholarship on the Armenian Genocide, 2015–2021". En Documenting the Armenian Genocide, 273–99. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-36753-3_14.
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AbstractAfter the explosion of writing on the Armenian Genocide in the centennial year, 2015, scholars have steadily produced new research and writing on the events of 1915–1916 in the late Ottoman Empire that have deepened our understanding of the trajectories and tragedies of those years. While a comprehensive review of everything published would require a small monograph, this chapter will review several important but diverse recent contributions: Hans-Lukacs Kieser, Talaat Pasha: Father of Modern Turkey, Architect of Genocide (Princeton: Princeton University Press, 2018); Benny Morris and Dror Ze’evi, The Thirty-Year Genocide: Turkey’s Destruction of its Christian Minorities, 1894–1924 (Cambridge, MA: Harvard University Press, 2019); Ümit Kurt, The Armenians of Aintab: The Economics of Genocide in an Ottoman Province (Cambridge, MA: Harvard University Press, 2021); and Harry Harootunian, The Unspoken Heritage: The Armenian Genocide and its Unaccounted Lives (Durham and London: Duke University Press, 2019).The chapter will begin with a review of the historiography on the Armenian Genocide as of 2015. Scholarship produced during the last twenty-five years has essentially routed the denialist interpretation and established a firm foundation for understanding the ethnic cleansing, forced assimilation, property confiscations, and mass killing of Armenians and Assyrians as a genocide. The work of Raymond Kévorkian, Taner Akçam, Fatma Müge Goçek, Hilmar Kaiser, Hans-Lukas Kieser, Richard Hovannisian and his students, among them Stephan Astourian, and many Turkish, Kurdish, and Armenian colleagues in Turkey has been essential. The Workshop for Armenian/Turkish Scholarship (WATS) has been an ongoing effort on the part of a number of scholars—Armenian, Turkish and other—to investigate the causes, circumstances and consequences of the Armenian Genocide of 1915, overcoming the politics of recognition and denial. The historical record has been made, although political and polemical campaigns against truth and accurate and evidenced historical knowledge continue both in Turkey and elsewhere.The chapter will explore what is new, and whether the paradigm established by 2015 has changed, been amplified, and significantly improved. It will address the significant contributions made since 2015, beyond the “WATS consensus,” which was basically in place by the centennial year and formed the basis for my book “They Can Live in the Desert but Nowhere Else:” A History of the Armenian Genocide (Princeton: Princeton University Press, 2015).
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"The Information Explosion". En A Conceptual Framework for SMART Applications in Higher Education, 1–15. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1542-6.ch001.
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This chapter lays the foundation for the conceptual framework by providing a background of the information explosion. The growth of information is examined from the year 1 AD to 2018 AD. The information explosion produced four major revolutions with intermediate contributions. The four information revolutions were identified by Peter Drucker as the invention of writing, the book, the printing press, and the computer age. This growth is delineated by the years in which information doubled. He compared the advent of the printing press (information revolution three) to the coming of age of the computer and the internet (the fourth of the four information revolutions). Each information revolution generated the need for allied industries. The massive growth of information may be coped with by becoming more effective and efficient learners and teachers.
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Sládek, Pavel. "Sixteenth-Century Jewish Makers of Printed Books and the Shaping of Late Renaissance Jewish Literacy". En Connected Jews, 45–68. Liverpool University Press, 2019. http://dx.doi.org/10.3828/liverpool/9781906764869.003.0002.
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This chapter looks at the medium of printed books that was introduced into Jewish culture soon after its emergence in the mid-fifteenth century. It discusses the arrival of the presses that were run by different members of the Jewish Soncino family in Italy and elsewhere at the beginning of the 1480s, wherein a wide variety of genres appeared in print. It also describes the Soncino editions that were distinguished among printers by the accuracy and beauty of their typefaces. The chapter mentions the early printed book that was seen as a radical innovation in the age of complex cultural transformations both within and outside Jewish society. It recounts how the 'knowledge explosion' that was spurred by the rise of the printing press was a key factor in the formation of early modern Jewish cultural history.
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"IEEE Press Series on Digital and Mobile Communication". En Techniques for Surviving the Mobile Data Explosion, 203. Hoboken, NJ: John Wiley & Sons, Inc, 2014. http://dx.doi.org/10.1002/9781118834404.oth1.
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Hair, Ross. "Small is Quite Beautiful: Tarasque Press". En Avant-Folk: Small Press Poetry Networks from 1950 to the Present. Liverpool University Press, 2017. http://dx.doi.org/10.5949/liverpool/9781781383292.003.0005.
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The 1960s saw an explosion of mimeographed poetry magazines and books on both sides of the Atlantic. Chapter four provides a broad overview of this ‘mimeo revolution,’ tracing its origins back to the do-it-yourself ethos of Black Mountain and the burgeoning of the ‘New American Poetry.’ As chapter 4 discusses, with this explosion of small-scale publishing, however, came more problematic issues of quality, both with regard to the production standards of the publications and the poetry they published. Chapter 4 examines how the British little magazine Tarasque and the eponymous small press established by Stuart Mills and Simon Cutts responded to this side of the mimeo revolution with a potent mix of trenchant irony and a championing of the small poem—as practiced by Finlay and Williams—that emphasized impersonal, constructed formal objectivity in answer to the expressive solipsism of the time.
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Whorton, James C. "The Holistic Health Explosion: Acupuncture". En Nature Cures, 245–70. Oxford University PressNew York, NY, 2002. http://dx.doi.org/10.1093/oso/9780195140712.003.0011.
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Abstract Acrisis of confidence in modern medicine is upon us,” Ivan Illich announced near the beginning of his 1975 Medical Nemesis. Crisis was in fact the medical leitmotif of the decade. On assuming the presidency in 1969, Richard Nixon had warned Americans that “we face a massive crisis” in medical care, and a national poll conducted a year later found that three-fourths of heads of households agreed with the statement “There is a crisis in health care in the United States.” Rising costs and limited accessibility to care were major factors in generating the sense of crisis, but equally important was dissatisfaction with physicians. A wave of books such as Medical Nemesis, Thomas McKeown’s The Role of Medicine, Rick Carlson’s The End of Medicine, and Marcia Millman’s The Unkindest Cut, not to mention numerous articles in lay periodicals, repeatedly took the profession to task for a catalogue of sins both committed and omitted. The unifying theme of allopathic medicine’s antagonists, voiced so effectively by Illich, was that modern medicine was guilty of a “presumptious expertise” that required every form of human suffering to be pressed into its narrow biomechanical construct of disease. And just as hubris had been punished by the ancient Greeks through Nemesis, the goddess of retribution, so medicine would get its comeuppance for so arrogantly ignoring the human facets of illness that did not fit easily into the biomedical box. MDs would have to answer, in short, for not treating the whole patient.
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Shaw, Graham. "South Asia". En The Oxford History of the Book, 238–65. Oxford University PressOxford, 2023. http://dx.doi.org/10.1093/oso/9780192886897.003.0010.
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Abstract The history of textual transmission in South Asia extends back almost 4,000 years through traditions of orality and public performance, manuscript production, and print. Oral transmission and public performance have persisted from 1750 bce to the present day, while manuscripts were widely produced from the fifth century bce to the nineteenth century. Print as a major cultural carrier came to prominence only from the nineteenth century onwards. In Hinduism, oral transmission maintained the Brahmin’s monopoly on sacred knowledge. The breakaway movements of Buddhism and Jainism ushered in the manuscript era to record the teachings of their founders. Xylography did not permeate the subcontinent but Buddhist Sanskrit texts were woodblock-printed in Central Asia. Typography, from its introduction by the Portuguese in the sixteenth century, remained the preserve of European evangelists and colonialists until 1800. Indian-owned presses proliferated only after the liberal Press Act of 1835, leading to an explosion of print in all the regional languages. At the same time, lithography became popular among Muslim communities. Paper as a writing medium was only introduced in the thirteenth century by Muslims, replacing the indigenous surfaces of palm-leaf and birch-bark.
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Benedict, Helen. "Blindfolded". En Feminism, Media, and the Law, 267–72. Oxford University PressNew York, NY, 1997. http://dx.doi.org/10.1093/oso/9780195096286.003.0022.
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Abstract Feminists are funny—at least that is the attitude I have discovered in my examination of a decade’s worth of rape coverage by the American press. Feminists are dogmatic at best, extremist at worst. At any rate, they are not to be consulted about anything as explosive as a rape case. To do so would be to commit biased reporting.
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Malgrati, Paul. "Explosive Memory: Burns Enters the Twentieth Century (1914–1919)". En Robert Burns and Scottish Cultural Politics, 35–52. Edinburgh University Press, 2023. http://dx.doi.org/10.3366/edinburgh/9781399503457.003.0002.
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This section introduces the main political actors seeking control over Burns’s legacy in early twentieth-century Scotland. Following a ‘Prologue’ narrating the Suffragettes’ failed arson attempt at Burns’s Cottage in July 1914, it explains how early socialist and feminist attempts to reclaim Burns were thwarted by the Great War, as the poet’s legacy became requisitioned by army propagandists on the Home Front, in the state, church, press, and Burns clubs. This jingoistic redirection of Burns’s Victorian myth remained dominant until the second part of the war, when growing pacifism encouraged radicals to produce an updated, combative portrait of Burns that would shape left-wing interpretations of the poet for decades to come.
Actas de conferencias sobre el tema "Explosifs pressés"
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Buechler, Miles A., Nathan A. Miller, D. J. Luscher, Ricardo B. Schwarz y Darla Graff Thompson. "Modeling the Effects of Texture on Thermal Expansion in Pressed PBX 9502 Components". En ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-68235.
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This paper demonstrates the effects of texture induced during pressing of PBX 9502 charges. We quantify the spatially variable anisotropic thermal strains associated with preferred orientation of TATB crystallographic (002) poles within manufactured components. The modeling approach is based on a series of three models. First, a component-level finite element model of the charge during consolidation from powder into pressed explosives is used to predict the deformation associated with this process. The deformation predicted from these simulations is used with a texture evolution model to estimate orientation distributions for TATB crystals at every integration point within the HE charge. The orientation distributions estimated using the texture evolution model are used within a self-consistent homogenization scheme to predict the spatially-variable macroscopic or aggregate thermal strain as a function of temperature at every location within the pressed component. Results are compared with measurements of texture and anisotropic thermal expansion for several locations sampled from pressed explosive components.
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Iyama, Hirofumi y Shigeru Itoh. "Study on Explosive Forming of a Light Alloy Plate". En ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93356.
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The explosive forming is one of the forming methods of metal plates has been performed since 1950. This method is different from usual static press forming. The metal plate is accelerated by underwater shock wave, which is generated by underwater explosion of an explosive. We have tried the experiment of aluminum alloy forming using this method. In this research, a forming limit for aluminum alloy has been clarified from the experimental results. Then, we have tried the numerical simulation for this method using finite difference method. In this research, two methods for forming aluminum plates using closed metal vessel and paper vessel are introduced and the results of numerical simulations corresponding to those experimental conditions are shown.
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Iyama, Hirofumi, Takeshi Hinata y Shigeru Itoh. "Deformation Mechanism of Metal Plate on Explosive Forming". En ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71560.
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The explosive forming is one of the forming methods of a metal plate performed since the 1950s. This method is different from usual static press forming. The metal plate is accelerated by underwater shock wave, which is generated by underwater explosion of an explosive. In order to deform a metal plate in predetermined form with sufficient accuracy using this forming method, it is important to grasp the mechanism. At first, it is necessary to grasp that an underwater shock wave spreads and it collides with the metal plate. And it is also necessary to show clearly what deformation of the metal plate with high-speed. Then, we investigated about the mechanism in the numerical simulation. In this research, LS-DYNA, which is the software for shock analysis was used. Moreover, the experiment was also conducted in order to confirm whether this numerical simulation is exact.
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KUMAR, DINESH, BALKISHAN PAL, BALWINDER KUMAR y VIKAS BHARDWAJ. "A REVIEW OF FUTURE TRENDS IN 3-D PRINTING OF ARMAMENT AND EXPLOSIVE DEVICES". En 32ND INTERNATIONAL SYMPOSIUM ON BALLISTICS. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/ballistics22/36044.
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Advances in Computer aided design (CAD), modeling and Three-dimensional (3D) printing has led to paradigm shift in development of innovative and miniaturized explosive devices for armament applications. In conventional techniques, explosives are either pressed or casted and machined to required geometry. These conventional processes are mostly manual and monotonous; require high-cost tooling and the lead-time from concept to product is high. 3D printing is an automated additive manufacturing process in which the material is deposited layer-by-layer to build physical part with any intricate geometry and profile, from the CAD model of the part. 3D printing of explosive devices offers advantages of computer aided design techniques, automation, direct physical part fabrication, low lead-time, low cost and any geometrical shape can be printed. It also offers advantage of printing explosive parts in the battlefields. In this paper, along with the detailed review of future trends in 3D printing of armament and explosive devices, a case study of 3D printing of plastic bullets in Acrylonitrile Butadiene Styrene (ABS) material is presented. The plastic bullets are used in low intensity conflicts and riot control. The experimental firing trials were conducted using standard AK- 47 gun firing on Gelatin target blocks placed at 30 m distance from the muzzle of the gun. The trials showed performance of ABS bullets in terms of lethality and velocity drop comparable to existing plastic bullets made of Nylon-66 manufactured by injection molding process. 3D printed ABS bullets have advantage of batch-to-batch repeatability, high accuracy. 3D printing is revolutionizing the way armament and explosive devices are manufactured, performance improvement and miniaturization.
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Jia, Lin, Lin-jun Zhang, Dong-mei Zhang, Yan Gu, Kai-di Xin, Zhi-qun Chen, Jie-yu Luan y Ke-yong Wang. "Thermal Improvable Behavior of A Pressed Fitting Mixed Explosive". En 2015 International Conference on Materials, Environmental and Biological Engineering. Paris, France: Atlantis Press, 2015. http://dx.doi.org/10.2991/mebe-15.2015.203.
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Demol, Gauthier. "Physical and chemical microstructural damage in pressed CL-20 explosives". En Shock compression of condensed matter. AIP, 2000. http://dx.doi.org/10.1063/1.1303573.
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Brundage, Aaron L. "Modeling Compressive Reaction in Shock-Driven Secondary Granular Explosives". En ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44130.
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Hexanitrostilbene (HNS) is a secondary, granular explosive with a wide usage in commercial and governmental sectors. For example, HNS is used in the aerospace industry as boosters in rockets, in the oil and gas industry in linear shaped charge designs in wellbore perforating guns, and in a number of applications in the US Department of Energy (DOE) and Department of Defense (DoD). In many of these applications, neat granules of HNS are pressed without binder and device performance is achieved with shock initiation of the powdered bed. Previous studies have demonstrated that powdered explosives do not transmit sharp shocks, but produce dispersive compaction waves. These compaction waves can induce combustion in the material, leading to a phenomenon termed Deflagration-to-Detonation Transition (DDT). The Baer-Nunziato (B-N) multiphase model was developed to predict compressive reaction in granular energetic materials due to shock and non-shock inputs using non-equilibrium multiphase mixture theory. The B-N model was fit to historical data of HNS, and this model was used to predict recent impact experiments where samples pressed to approximately 60% of theoretical maximum density (TMD) were shock loaded by high-velocity flyers [1]. Shock wave computations were performed using CTH, an Eulerian, multimaterial, multidimensional, finite-volume shock physics code developed at Sandia National Laboratories [2]. Predicted interface velocities using the B-N model were shown to be in good agreement with the measurements. Furthermore, an uncertainty quantification study was performed and the computational results are presented with best estimates of uncertainty.
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Trott, Wayne M. y Anita M. Renlund. "Optical Methods for the Study of Explosive Chemistry". En Lasers in Material Diagnostics. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/lmd.1987.wc4.
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An understanding of the reaction zone in a detonating high explosive (HE) requires characterization of both the mechanical response of the material and the chemical reaction mechanisms that control the rate at which the HE is consumed. Moreover, the detailed chemistry is clearly a contributing factor in the shock-initiation of energetic materials. Although a considerable body of empirical knowledge on shock sensitivity and explosive performance is presently available, practically no information exists regarding the important microscopic physical and chemical processes. Much additional insight into these processes is needed for the development of predictive capabilities in the areas of initiation and performance. In this paper, we discuss the application of several optical diagnostic methods for the study of explosive chemistry. We have emphasized techniques which provide good spatial and temporal resolution and are applicable to "single-shot" measurements on pressed, polycrystalline samples of widely used HEs. These techniques include electronic fast-framing photography, time-resolved emission spectroscopy, single-pulse Raman scattering and time-resolved infrared spectral photography (TRISP).
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Zhou, Yang, Zhongkang Lin, Anqi Dai, Xinling Tang y Junmin Wu. "Study on the Explosion-proof Failure of Press-pack Power Moducle Shell". En 2021 IEEE 1st International Power Electronics and Application Symposium (PEAS). IEEE, 2021. http://dx.doi.org/10.1109/peas53589.2021.9628542.
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Rumchik, C. G., J. L. Jordan, Mark Elert, Michael D. Furnish, Ricky Chau, Neil Holmes y Jeffrey Nguyen. "EFFECT OF ALUMINUM PARTICLE SIZE ON THE HIGH STRAIN RATE PROPERTIES OF PRESSED ALUMINIZED EXPLOSIVES". En SHOCK COMPRESSION OF CONDENSED MATTER - 2007: Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter. AIP, 2008. http://dx.doi.org/10.1063/1.2833243.
Texto completoInformes sobre el tema "Explosifs pressés"
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Griffin, J. High-explosives press safety shield testing. Office of Scientific and Technical Information (OSTI), junio de 1990. http://dx.doi.org/10.2172/6833064.
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Skidmore, C. B., D. S. Phillips, P. M. Howe, J. T. Mang y J. A. Romero. The evolution of microstructural changes in pressed HMX explosives. Office of Scientific and Technical Information (OSTI), diciembre de 1998. http://dx.doi.org/10.2172/334323.
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Olinger, B. Solid explosive plane-wave lenses pressed-to-shape with dies. Office of Scientific and Technical Information (OSTI), noviembre de 2007. http://dx.doi.org/10.2172/948561.
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Yeamans, Katelyn Angela. Unsupervised Machine Learning for Evaluation of Aging in Explosive Pressed Pellets. Office of Scientific and Technical Information (OSTI), diciembre de 2018. http://dx.doi.org/10.2172/1484618.
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Luscher, Darby J. Modeling the thermal deformation of TATB-based explosives. Part 1: Thermal expansion of “neat-pressed” polycrystalline TATB. Office of Scientific and Technical Information (OSTI), mayo de 2014. http://dx.doi.org/10.2172/1130514.
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