Our penetrator with the latest research developments and prospects tungsten alloy (c)

1.4 Calculation of numerical simulation

For a long time, the kinetic energy of the process of the target plate armor projectile impact analysis mainly rely on a large number of test results, with the increasing depth study of the phenomenon of piercing, some of the other methods used in the analysis of the role of projectile and target, such as empirical, theoretical analysis and numerical simulation method. Among them, the numerical simulation method provides a more comprehensive response to changes in the middle of the process parameters and physical piercing, using numerical simulation computer graphics technology design can also be visually illustrated throughout the piercing process various parameters (shape, stress, strain, etc.) changes; addition, the use of the computer program can select different physical and geometrical parameters are calculated for the various parameters obtained shells, the impact target interaction, which can give a more comprehensive analysis of the test results.

Michael et tungsten simulation results indicate that the internal stress field, tungsten alloy binder phase does not only occur in the stress concentration, but the first in the high-intensity tungsten particles [18]. High-density housing and other research Wenbin tungsten alloy hot hydrostatic extrusion process using numerical analysis methods, indicating hot hydrostatic extrusion at high temperatures, can significantly reduce the squeeze pressure and squeeze greater than [19] .荣吉利 other studies of penetration and fragmentation properties of tungsten alloy Fragile kinetic energy penetrators, based on the establishment of a tungsten alloy Fragile Projectile finite element analysis model, simulated with different tensile - compressive strength of tungsten alloy penetrators penetrating than the target penetration and crushing process plates at [20].

程兴旺 such as tungsten alloy casing vertical penetration through concrete target experiments, to obtain strain tungsten alloy casing dangerous section at the - time course curve, providing models and numerical verification standard penetration estimates for housing design [21]. Progress in any of the rain and other composite laminated reviewed the impact of the model for the design optimization of composite protective structure together proposed a new approach [22].

1.5 Preparation of technical

Refined tungsten particles become a new hot spot study of high-density tungsten alloy by mechanical alloying (MA), condensation drying method, chemical vapor deposition method, spray drying, sol - gel method and other methods for the preparation of pre-alloyed powder, and using a suitable process can be made very fine powder. Furthermore, the reaction process may be spray-step synthesis of fine grain, multi-component, the total of the pre-tungsten alloy powder, the powder can be well below the melting temperature of the binder phase sintering to achieve full density [23]. Fan Jinglian and other processes with MA Nanocrystalline tungsten alloy composite powder hydrogen atmosphere at normal pressure sintering and densification during sintering tungsten grain growth behavior, indicating MA nanocrystalline powders can promote densification temperature densification reduced by about 100 ~ 200 ℃, when the solid-phase sintering temperature can be generally obtained as a fine crystalline grain size of 3 ~ 5μm high strength alloys [24]. They also nano-tungsten alloy injection molding were studied in 1350 ~ 1450 ℃ showed solid phase sintering that reached full density, grain final alloy is about 3μm, tensile strength greater than 1200MPa [25].

罗述东 other studies of tungsten alloy powder warm compaction behavior at different temperatures, indicating that the temperature and pressure can significantly improve the green density, temperature and pressure radial contraction of less than room temperature blank blank radial contraction, and temperature and pressure can improve tungsten alloy microstructure organization [26]. Sample cold isostatic pressing of Lee letters buried in Al2O3 powder, placed in a sintering furnace heating and air after 30min pre-oxidation heat, and then sintered at different temperatures; results showed that the use of pre-oxidized tungsten alloy activated sintering can reduce the sintering temperature, reducing the alloy deformation and get dense tungsten alloy, and can improve the tensile strength and elongation of tungsten alloy [27].
 

References

[18] Michael, Lau Siu-ling, Zhao Baorong, and so on. Tungsten alloy internal stress field numerical simulation [J]. Ordnance Material Science and Engineering, 2005,28 (2) :51-54.

[19] House Wenbin, Oscar Wilde, Hu Lianxi, and so on. High-density tungsten alloy hot hydrostatic extrusion flow numerical viscosity Germany [J]. Rare Metal Materials and Engineering, 2005,34 (1) :33-36.

[20] Rongji Li, in the heart of the construction, Liu Bin, et al. Fragile kinetic energy penetrator armor-piercing tungsten alloy simulation and finite element analysis [J]. Beijing Institute of Technology, 2004,24? (3) :193-196.

[21] Chengxing Wang, Wang Fu shame, Lu Wang, et al. Experimental testing of tungsten alloy shell casing process penetrating concrete target strain [J]. Ordnance, 2004,25 (1) :102-105.
 
[22] any rain, ZHU Xi, Mei Zhiyuan. Composite laminates impact models [J]. Ordnance Material Science and Engineering, 2005,28 (4) :59-67.

[23] Ye passers-Ming Yi Jian Hong, and microstructure of, and so on. New Progress in the study of high-density tungsten alloy [J]. Powder Metallurgy Materials Science and Engineering. 2003,8 (2) :134-140.

[24] Fan Jinglian, Huang Baiyun, Qu Hui, et al. Densification and grain nanocrystalline tungsten alloy powder during pressureless sintering [J]. Powder Metallurgy Materials Science and Engineering, 2001,6 (2) :83-88.

[25] Huang Baiyun, Fan Jinglian, Qu Hui, et al. Research and Application of Nano-tungsten alloys [J]. China Tungsten Industry. 2001,2001,16 (5-6) :38-43.

[26] Luo Shudong, Tang Xinwen, Cao Zhenghua, high density tungsten alloy powder warm compaction behavior [J]. Powder Metallurgy Materials Science and Engineering. 2003,8 (1) :23-27.

[27] Li Xin, wusheng. Pre-oxidation of high-density sintered tungsten alloy [J]. Rare Metal Materials and Engineering, 2002,31 (4): 319.


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