Development of Tungsten Heavy Alloy with Hybrid Structure for Kinetic Energy Penetrator

2007 ◽  
Vol 534-536 ◽  
pp. 1249-1252
Author(s):  
Woon Hyung Baek ◽  
Eun Pyo Kim ◽  
Heung Sub Song ◽  
Moon Hee Hong ◽  
Seong Lee ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Outer Part ◽  
Hybrid Structure ◽  
Core Region ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Brittle Behavior ◽  
The Core ◽  
Ballistic Test ◽  
Near Future

A new tungsten heavy alloy with hybrid structure was manufactured for the kinetic energy penetrator. The tungsten heavy alloy is composed of two parts: core region is molybdenum added heavy alloy to promote the self-sharpening; outer part encompassing the core is conventional heavy alloy to sustain severe load in a muzzle during firing. The fracture surfaces of the specimen is observed after ballistic tests. The core region revealed brittle behavior with W/W inter-granular fracture which activates self-sharpening. On the other hand, outer part exhibited conventional ductile fracture mode. From ballistic test, it was found that the penetration performance of the hybrid structure tungsten heavy alloy is higher than that of conventional heavy alloy. This heavy alloy is thought to be very useful for the penetrator in the near future.

Development of Tungsten Heavy Alloy with Hybrid Structure for Kinetic Energy Penetrator

2007 ◽  
pp. 1249-1252
Author(s):  
Woon Hyung Baek ◽  
Eun Pyo Kim ◽  
Heung Sub Song ◽  
Moon Hee Hong ◽  
Seong Lee ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Hybrid Structure ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy

STUDY ON THE RELATION BETWEEN MECHANICAL AND BALLISTIC PROPERTIES OF SOME CERAMICS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1201-1208 ◽  
Author(s):  
CHEOL SOO KIM ◽  
CHANG WOOK KIM
Keyword(s):  
Mechanical Properties ◽  
Kinetic Energy ◽  
Flexural Strength ◽  
Density Ratio ◽  
Shaped Charge ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Engineering Ceramics ◽  
Ballistic Properties ◽  
Long Rod

In this study, we analyzed the relation between mechanical and ballistic properties of several engineering ceramics that were expected to be used as armor materials. After the measurements of mechanical properties (Young's modulus, density, hardness, flexural strength and toughness), we measured the ballistic properties against a long rod KE projectile ( L / D =10.7, Kinetic Energy, tungsten heavy alloy) and copper jet projectile (40mm shaped charge warhead). The ballistic properties were generally increased as the increasing ratio of mechanical properties and density. As the HEL/density ratio was increased, it especially appeared that the ballistic properties were lineally increased.

The Research Status of the Preparation and Properties of the Tungsten Heavy Alloy

2014 ◽  
Vol 977 ◽  
pp. 51-54 ◽  
Author(s):  
Xiao Liang Fang ◽  
Wei Fang Zhang ◽  
Hong Xun Wang
Keyword(s):  
Mechanical Properties ◽  
Kinetic Energy ◽  
Heavy Alloy ◽  
Chemical Characteristics ◽  
Tungsten Heavy Alloy ◽  
Preparation Process ◽  
Broad Application ◽  
Uranium Alloy ◽  
Physical And Chemical ◽  
Application Prospects

Due to the excellent physical and chemical characteristics and mechanical properties of the tungsten heavy alloy (WHA), the WHAs have been widely applied in many areas of the national economy. In this paper, the concept of the WHA is introduced briefly, and the preparation process and properties of the WHAs are summarized. Compared with depleted uranium alloy, the WHA shows broad application prospects in the field of kinetic energy projectile.

Intramitochondrial Viruses of Reptilian Cell Origin

1972 ◽  
Vol 30 ◽  
pp. 318-319
Author(s):  
Philip D. Lunger ◽  
H. Fred Clark
Keyword(s):  
Particle Production ◽  
Outer Zone ◽  
Density Variation ◽  
Core Region ◽  
Mitochondrial Membranes ◽  
Virus Particles ◽  
The Core ◽  
Vipera Russelli ◽  
Maturation Stages ◽  
Type Particle

In the course of fine structure studies of spontaneous “C-type” particle production in a viper (Vipera russelli) spleen cell line, designated VSW, virus particles were frequently observed within mitochondria. The latter were usually enlarged or swollen, compared to virus-free mitochondria, and displayed a considerable degree of cristae disorganization.Intramitochondrial viruses measure 90 to 100 mμ in diameter, and consist of a nucleoid or core region of varying density and measuring approximately 45 mμ in diameter. Nucleoid density variation is presumed to reflect varying degrees of condensation, and hence maturation stages. The core region is surrounded by a less-dense outer zone presumably representing viral capsid.Particles are usually situated in peripheral regions of the mitochondrion. In most instances they appear to be lodged between loosely apposed inner and outer mitochondrial membranes.

Microstructure and mechanical properties of a rotary friction welded tungsten heavy alloy

2019 ◽  
Vol 61 (3) ◽  
pp. 209-212
Author(s):  
Ramachandran Damodaram ◽  
Gangaraju Manogna Karthik ◽  
Sree Vardhan Lalam
Keyword(s):  
Mechanical Properties ◽  
Heavy Alloy ◽  
Tungsten Heavy Alloy ◽  
Microstructure And Mechanical Properties

scholarly journals On the Nature of R 136, the Central Object of 30 Dor. A Comparison by the Galactic Cluster NGC 3603

1984 ◽  
Vol 108 ◽  
pp. 257-258
Author(s):  
Michael Rosa ◽  
Jorge Melnick ◽  
Preben Grosbol
Keyword(s):  
Core Region ◽  
H Ii Regions ◽  
Central Object ◽  
The Core ◽  
Dominant Component ◽  
Galactic Cluster ◽  
H Ii Region

The massive H II region NGC 3603 is the closest galactic counterpart to the giant LMC nebula 30 Dor. Walborn (1973) first compared the ionizing OB/WR clusters of the two H II regions and suggested that R 136, the unresolved luminous WR + 0 type central object of 30 Dor, might be a multiple system like the core region of NGC 3603. Suggestions that the dominant component of R 136, i.e. R 136A, might be either a single or a very few supermassive and superluminous stars (Schmidt-Kaler and Feitzinger 1982, Savage et al. 1983) have recently been disputed by Moffat and Seggewiss (1983) and Melnick (1983), who have presented spectroscopic and photometric evidence to support the hypothesis of an unresolved cluster of stars. We have extended Walborn's original comparison of the apparent morphology of the two clusters by digital treatment of the images to simulate how the galactic cluster would look like if it were located in the LMC

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