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Yu Zheng - One of the best experts on this subject based on the ideXlab platform.
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method of converting a multimode Penetrator through point initiation
Combustion Explosion and Shock Waves, 2012Co-Authors: X M Wang, Yu ZhengAbstract:This study presents the problem of achieving multimode Penetrator conversion. By using the same shaped charge and by changing the position of point initiation, the trial demonstrates two types of the Penetrator, which are the explosively formed Penetrator (EFP) and the rod-shaped EFP. Compared with the EFP, the penetration depth of the rod-shaped EFP is 2.17 times higher, and the penetration aperture only decreases by 31.8%.
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research on the optimum length diameter ratio of the charge of a multimode warhead
Shock Waves, 2012Co-Authors: Weibing Li, Wenbin Li, Xiaoming Wang, Yu ZhengAbstract:This paper outlines our research on a multimode warhead in which we adopted center point and annular initiation modes to form multimode Penetrators. Using LS-DYNA software, we studied the effect of the configuration parameters, namely the length/diameter ratio of the shaped charge, on the formation parameters, such as the velocity and length/diameter ratio, of multimode Penetrators. We found that when the charge length was in the range of 0.9–1.2 times the charge diameter, the same structure of shaped charge can form suitable multimode Penetrators. Either an explosively formed Penetrator (EFP) or a long stretchy rod-shaped EFP Penetrator can be formed. We establish an optimum charge length for Penetrator formation of 1.4 times the charge diameter. Simulation results were validated using X-ray imaging experiments and they were in good agreement. The results found that by increasing the charge length from 0.9 to 1.4 times the charge diameter, the penetration depth of the EFP increased by 74.5%, while increasing the charge length from 1.4 to 1.6 times the charge diameter only increased the penetration depth by 1.9%.
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Research on the optimum length–diameter ratio of the charge of a multimode warhead
Shock Waves, 2012Co-Authors: Weibing Li, Wenbin Li, Xiaoming Wang, Yu ZhengAbstract:This paper outlines our research on a multimode warhead in which we adopted center point and annular initiation modes to form multimode Penetrators. Using LS-DYNA software, we studied the effect of the configuration parameters, namely the length/diameter ratio of the shaped charge, on the formation parameters, such as the velocity and length/diameter ratio, of multimode Penetrators. We found that when the charge length was in the range of 0.9–1.2 times the charge diameter, the same structure of shaped charge can form suitable multimode Penetrators. Either an explosively formed Penetrator (EFP) or a long stretchy rod-shaped EFP Penetrator can be formed. We establish an optimum charge length for Penetrator formation of 1.4 times the charge diameter. Simulation results were validated using X-ray imaging experiments and they were in good agreement. The results found that by increasing the charge length from 0.9 to 1.4 times the charge diameter, the penetration depth of the EFP increased by 74.5%, while increasing the charge length from 1.4 to 1.6 times the charge diameter only increased the penetration depth by 1.9%.
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Research on the optimum length–diameter ratio of the charge of a multimode warhead
Shock Waves, 2012Co-Authors: Weibing Li, Wenbin Li, Xiaoming Wang, Yu ZhengAbstract:This paper outlines our research on a multimode warhead in which we adopted center point and annular initiation modes to form multimode Penetrators. Using LS-DYNA software, we studied the effect of the configuration parameters, namely the length/diameter ratio of the shaped charge, on the formation parameters, such as the velocity and length/diameter ratio, of multimode Penetrators. We found that when the charge length was in the range of 0.9–1.2 times the charge diameter, the same structure of shaped charge can form suitable multimode Penetrators. Either an explosively formed Penetrator (EFP) or a long stretchy rod-shaped EFP Penetrator can be formed. We establish an optimum charge length for Penetrator formation of 1.4 times the charge diameter. Simulation results were validated using X-ray imaging experiments and they were in good agreement. The results found that by increasing the charge length from 0.9 to 1.4 times the charge diameter, the penetration depth of the EFP increased by 74.5%, while increasing the charge length from 1.4 to 1.6 times the charge diameter only increased the penetration depth by 1.9%.
Brown P. - One of the best experts on this subject based on the ideXlab platform.
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Lunar Net-a proposal in response to an ESA M3 call in 2010 for a medium sized mission
'Springer Science and Business Media LLC', 2012Co-Authors: Smith Alan, Ambrosi R., Anand M., Banerdt B., Bannister N., Bowles N., Braithwaite C., Crawford I. A., Gowen, Robert Anthony, Brown P.Abstract:Emplacement of four or more kinetic Penetrators geographically distributed over the lunar surface can enable a broad range of scientific exploration objectives of high priority and provide significant synergy with planned orbital missions. Whilst past landed missions achieved a great deal, they have not included a far-side lander, or investigation of the lunar interior apart from a very small area on the near side. Though the LCROSS mission detected water from a permanently shadowed polar crater, there remains in-situ confirmation, knowledge of concentration levels, and detailed identification of potential organic chemistry of astrobiology interest. The planned investigations will also address issues relating to the origin and evolution of the Earth-Moon system and other Solar System planetary bodies. Manned missions would be enhanced with use of water as a potential in-situ resource; knowledge of potential risks from damaging surface Moonquakes, and exploitation of lunar regolith for radiation shielding. LunarNet is an evolution of the 2007 LunarEX proposal to ESA (European Space Agency) which draws on recent significant advances in mission definition and feasibility. In particular, the successful Pendine full-scale impact trials have proved impact survivability for many of the key technology items, and a Penetrator system study has greatly improved the definition of descent systems, detailed Penetrator designs, and required resources. LunarNet is hereby proposed as an exciting stand-alone mission, though is also well suited in whole or in-part to contribute to the jigsaw of upcoming lunar missions, including that of a significant element to the ILN (International Lunar Network)
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Lunar Net—a proposal in response to an ESA M3 call in 2010 for a medium sized mission
Springer, 2012Co-Authors: Smith Alan, Crawford Ian, Gowen R.a., Ambrosi R., Anand M., Banerdt B., Bannister N., Bowles N., Braithwaite C., Brown P.Abstract:Emplacement of four or more kinetic Penetrators geographically distributed over the lunar surface can enable a broad range of scientific exploration objectives of high priority and provide significant synergy with planned orbital missions. Whilst past landed missions achieved a great deal, they have not included a far-side lander, or investigation of the lunar interior apart from a very small area on the near side. Though the LCROSS mission detected water from a permanently shadowed polar crater, there remains in-situ confirmation, knowledge of concentration levels, and detailed identification of potential organic chemistry of astrobiology interest. The planned investigations will also address issues relating to the origin and evolution of the Earth–Moon system and other Solar System planetary bodies. Manned missions would be enhanced with use of water as a potential in-situ resource; knowledge of potential risks from damaging surface Moonquakes, and exploitation of lunar regolith for radiation shielding. LunarNet is an evolution of the 2007 LunarEX proposal to ESA (European Space Agency) which draws on recent significant advances in mission definition and feasibility. In particular, the successful Pendine full-scale impact trials have proved impact survivability for many of the key technology items, and a Penetrator system study has greatly improved the definition of descent systems, detailed Penetrator designs, and required resources. LunarNet is hereby proposed as an exciting stand-alone mission, though is also well suited in whole or in-part to contribute to the jigsaw of upcoming lunar missions, including that of a significant element to the ILN (International Lunar Network)
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Lunar Net-a proposal in response to an ESA M3 call in 2010 for a medium sized mission
'Springer Science and Business Media LLC', 2012Co-Authors: Smith A., Ambrosi R., Anand M., Banerdt B., Bannister N., Bowles N., Braithwaite C., Gowen R., Brown P.Abstract:Emplacement of four or more kinetic Penetrators geographically distributed over the lunar surface can enable a broad range of scientific exploration objectives of high priority and provide significant synergy with planned orbital missions. Whilst past landed missions achieved a great deal, they have not included a far-side lander, or investigation of the lunar interior apart from a very small area on the near side. Though the LCROSS mission detected water from a permanently shadowed polar crater, there remains in-situ confirmation, knowledge of concentration levels, and detailed identification of potential organic chemistry of astrobiology interest. The planned investigations will also address issues relating to the origin and evolution of the Earth-Moon system and other Solar System planetary bodies. Manned missions would be enhanced with use of water as a potential in-situ resource; knowledge of potential risks from damaging surface Moonquakes, and exploitation of lunar regolith for radiation shielding. LunarNet is an evolution of the 2007 LunarEX proposal to ESA (European Space Agency) which draws on recent significant advances in mission definition and feasibility. In particular, the successful Pendine full-scale impact trials have proved impact survivability for many of the key technology items, and a Penetrator system study has greatly improved the definition of descent systems, detailed Penetrator designs, and required resources. LunarNet is hereby proposed as an exciting stand-alone mission, though is also well suited in whole or in-part to contribute to the jigsaw of upcoming lunar missions, including that of a significant element to the ILN (International Lunar Network). © 2011 Springer Science+Business Media B.V
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Lunar Net-a proposal in response to an ESA M3 call in 2010 for a medium sized mission
'Springer Science and Business Media LLC', 2012Co-Authors: Smith A., R. A. Gowen, Ambrosi R., Anand M., Banerdt B., Bannister N., Bowles N., Braithwaite C., Ia Crawford, Brown P.Abstract:Emplacement of four or more kinetic Penetrators geographically distributed over the lunar surface can enable a broad range of scientific exploration objectives of high priority and provide significant synergy with planned orbital missions. Whilst past landed missions achieved a great deal, they have not included a far-side lander, or investigation of the lunar interior apart from a very small area on the near side. Though the LCROSS mission detected water from a permanently shadowed polar crater, there remains in-situ confirmation, knowledge of concentration levels, and detailed identification of potential organic chemistry of astrobiology interest. The planned investigations will also address issues relating to the origin and evolution of the Earth–Moon system and other Solar System planetary bodies. Manned missions would be enhanced with use of water as a potential in-situ resource; knowledge of potential risks from damaging surface Moonquakes, and exploitation of lunar regolith for radiation shielding. LunarNet is an evolution of the 2007 LunarEX proposal to ESA (European Space Agency) which draws on recent significant advances in mission definition and feasibility. In particular, the successful Pendine full-scale impact trials have proved impact survivability for many of the key technology items, and a Penetrator system study has greatly improve
D A Shockey - One of the best experts on this subject based on the ideXlab platform.
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micromechanical model for comminution and granular flow of brittle material under high strain rate application to penetration of ceramic targets
International Journal of Impact Engineering, 1993Co-Authors: D.r. Curran, L Seaman, T. Cooper, D A ShockeyAbstract:Abstract Under sufficiently energetic attack by Penetrators or explosives, brittle materials are comminuted and forced into large strain divergent flow, deforming non-elastically by sliding and ride-up of fragments, with accompanying competition between dilatancy and pore compaction. This paper describes a micromechanical model of such deformation with application to penetration of thick ceramic targets. The model was used in parametric finite element code calculations of the penetration of an eroding, long tungsten rod into a target package consisting of a thick aluminum nitride plate confined in steel. The calculations successfully exhibited the key generic features commonly observed experimentally, including the formation of a comminuted ceramic region around the eroding Penetrator nose, dilatant expansion of comminuted material into the region behind the Penetrator, and conical fractures radiating outward from this region into the intact material. The most important ceramic properties that govern the depth of penetration were inferred to be the friction between comminuted granules, the unconfined compressive strength of the intact material and the compaction strength of the comminuted material. However, further work is needed to define the relative importance of the properties of the comminuted and intact material.
P. W. Kingman - One of the best experts on this subject based on the ideXlab platform.
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Characterization of ballistically deformed tungsten [100]-, [111]-, and [110]-oriented single crystal Penetrators by optical metallography, x-ray diffraction and transmission electron microscopy
Journal of Materials Research, 2004Co-Authors: R. A. Herring, W. J. Bruchey, P. W. KingmanAbstract:Single-crystal Penetrators of tungsten having orientations of [100], [111], and [110] were ballistically deformed into targets of standard armor material and characterized by optical metallography, x-ray diffraction, and transmission electron microscopy (TEM) methods, which showed significant differences in their deformation mechanisms and microstructures corresponding to their deformation performance as measured by the penetration of the target. The [100] single-crystal Penetrator, which produced the most energy efficient deformation, provided a new, alternative mechanism for ballistic deformation by forming small single-crystal blocks, defined by {100} oriented cracks, which rotated during extrusion from the interior to the side of the Penetrator while maintaining their single crystal integrity. The [111] single-crystal Penetrator transferred mass along allowed, high-angle deformation planes to the Penetrator’s side where a buildup of mass mushroomed the tip until the built-up mass let go along the sides of the Penetrator, creating a wavy cavity. The [110] Penetrator, which produced the least energy-efficient deformation, has only two allowed deformation planes, cracked and rotated to invoke other deformation planes.
Weibing Li - One of the best experts on this subject based on the ideXlab platform.
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research on the optimum length diameter ratio of the charge of a multimode warhead
Shock Waves, 2012Co-Authors: Weibing Li, Wenbin Li, Xiaoming Wang, Yu ZhengAbstract:This paper outlines our research on a multimode warhead in which we adopted center point and annular initiation modes to form multimode Penetrators. Using LS-DYNA software, we studied the effect of the configuration parameters, namely the length/diameter ratio of the shaped charge, on the formation parameters, such as the velocity and length/diameter ratio, of multimode Penetrators. We found that when the charge length was in the range of 0.9–1.2 times the charge diameter, the same structure of shaped charge can form suitable multimode Penetrators. Either an explosively formed Penetrator (EFP) or a long stretchy rod-shaped EFP Penetrator can be formed. We establish an optimum charge length for Penetrator formation of 1.4 times the charge diameter. Simulation results were validated using X-ray imaging experiments and they were in good agreement. The results found that by increasing the charge length from 0.9 to 1.4 times the charge diameter, the penetration depth of the EFP increased by 74.5%, while increasing the charge length from 1.4 to 1.6 times the charge diameter only increased the penetration depth by 1.9%.
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Research on the optimum length–diameter ratio of the charge of a multimode warhead
Shock Waves, 2012Co-Authors: Weibing Li, Wenbin Li, Xiaoming Wang, Yu ZhengAbstract:This paper outlines our research on a multimode warhead in which we adopted center point and annular initiation modes to form multimode Penetrators. Using LS-DYNA software, we studied the effect of the configuration parameters, namely the length/diameter ratio of the shaped charge, on the formation parameters, such as the velocity and length/diameter ratio, of multimode Penetrators. We found that when the charge length was in the range of 0.9–1.2 times the charge diameter, the same structure of shaped charge can form suitable multimode Penetrators. Either an explosively formed Penetrator (EFP) or a long stretchy rod-shaped EFP Penetrator can be formed. We establish an optimum charge length for Penetrator formation of 1.4 times the charge diameter. Simulation results were validated using X-ray imaging experiments and they were in good agreement. The results found that by increasing the charge length from 0.9 to 1.4 times the charge diameter, the penetration depth of the EFP increased by 74.5%, while increasing the charge length from 1.4 to 1.6 times the charge diameter only increased the penetration depth by 1.9%.
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Research on the optimum length–diameter ratio of the charge of a multimode warhead
Shock Waves, 2012Co-Authors: Weibing Li, Wenbin Li, Xiaoming Wang, Yu ZhengAbstract:This paper outlines our research on a multimode warhead in which we adopted center point and annular initiation modes to form multimode Penetrators. Using LS-DYNA software, we studied the effect of the configuration parameters, namely the length/diameter ratio of the shaped charge, on the formation parameters, such as the velocity and length/diameter ratio, of multimode Penetrators. We found that when the charge length was in the range of 0.9–1.2 times the charge diameter, the same structure of shaped charge can form suitable multimode Penetrators. Either an explosively formed Penetrator (EFP) or a long stretchy rod-shaped EFP Penetrator can be formed. We establish an optimum charge length for Penetrator formation of 1.4 times the charge diameter. Simulation results were validated using X-ray imaging experiments and they were in good agreement. The results found that by increasing the charge length from 0.9 to 1.4 times the charge diameter, the penetration depth of the EFP increased by 74.5%, while increasing the charge length from 1.4 to 1.6 times the charge diameter only increased the penetration depth by 1.9%.
