Computational comparisons of statistical descriptions of a tungsten alloy subjected to explosive loading

2012 ◽  
Author(s):  
Michael Hopson ◽  
David Lambert
Keyword(s):  
Explosive Loading ◽  
Tungsten Alloy ◽  
Computational Comparisons

COMPUTATIONAL COMPARISONS OF HOMOGENEOUS AND STATISTICAL DESCRIPTIONS OF AEROMET100 STEEL SUBJECTED TO EXPLOSIVE LOADING

2009 ◽  
Author(s):  
M. V. Hopson ◽  
C. M. Scott ◽  
Mark Elert ◽  
Michael D. Furnish ◽  
William W. Anderson ◽  
...  
Keyword(s):  
Explosive Loading ◽  
Computational Comparisons

Computational Comparisons of Homogeneous and Statistical Descriptions of Steel Subjected to Explosive Loading

2010 ◽  
Author(s):  
Michael V. Hopson ◽  
David E. Lambert ◽  
Joseph Weiderhold
Keyword(s):  
Plane Strain ◽  
Computational Analysis ◽  
Stress Triaxiality ◽  
Uniaxial Stress ◽  
Explosive Loading ◽  
Ring Test ◽  
Tungsten Alloy ◽  
Expansion Velocity ◽  
Water Tank ◽  
Stress States

Experiments were conducted by the Munitions Directorate at the Air Force Research Laboratory to investigate the fracture and fragmentation of two different metals due to explosive loading. The first metal, Eglin Steel 1 (ES-1), was a high strength steel alloy configured as a thin shell surrounding the explosive core. The second metal, Aero 224, was a tungsten alloy configured as a stack of rings around the explosive core. The two different configurations generated two different stress states, plane-strain and uniaxial stress. The radial expansion velocity of the ES-1 shell was recorded via a photonic Doppler velocimeter (PDV). Also, the fragments from the ES-1 shell test and Aero 224 ring test were soft captured in a water tank. Complimentary computational analysis was conducted at the Naval Surface Warfare Center Dahlgren Division. The Eulerian wave propagation code, CTH, was used to analyze the stress states of the different configurations and also investigate the use of statistical compensation on explosive fragmentation. The stress states were examined in the context of stress triaxiality where triaxiality is defined as the ratio of pressure to the Von Mises stress. From the computational analysis both the ES-1 shell test and Aero 224 ring test approached, but did not reach the ideal triaxial values for plane-strain and uniaxial stress. Lastly, parametric calculations were conducted in order to determine the effectiveness of using a statistically compensated Johnson Cook fracture model to simulate the non-homogeneous nature of the ES-1 and Aero 224. While using the model did result in different fragment distributions, all the resulting distributions were less accurate than the baseline homogeneous calculation. Scrutiny of the early time fragment formation in the statistically compensated calculations revealed a mesh bias which caused material failure on surfaces parallel to the Cartesian axes. This preferential fracture produced rarefaction waves which prohibited further fragmentation thus generating fragment distributions larger than those observed in the Aero 224 ring test. Potential solutions for this issue will be explored in the future.

Dynamic Tensile Behavior of 93wt.% Tungsten Alloy and its Fractal Features of Fracture

1997 ◽  
Vol 07 (C3) ◽  
pp. C3-409-C3-414
Author(s):  
B.-P. Zhang ◽  
C. Ding ◽  
B. Liu ◽  
T. Jiao ◽  
H. Lin ◽  
...  
Keyword(s):  
Tensile Behavior ◽  
Tungsten Alloy

STOODY 4

Alloy Digest ◽  
1977 ◽  
Vol 26 (4) ◽  
Keyword(s):  
Solid Solution ◽  
Compressive Strength ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Heat Treating ◽  
Tungsten Alloy ◽  
High Temperature Strength ◽  
Cobalt Chromium ◽  
Temperature Performance

Abstract STOODY 4 is a cobalt-chromium-tungsten alloy with excellent high-temperature strength and excellent resistance to corrosion. This alloy derives its high-temperature strength from the high tungsten-to-carbon ratio which allows a large percentage of tungsten to remain in solid solution. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, and joining. Filing Code: Co-75. Producer or source: WRAP Division, Stoody Company.

BÖHLER K107

Alloy Digest ◽  
2020 ◽  
Vol 69 (9) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Abrasive Wear ◽  
Cold Work ◽  
Heat Treating ◽  
Abrasive Wear Resistance ◽  
Tungsten Alloy ◽  
High Carbon ◽  
Cold Work Tool Steel ◽  
Very High

Abstract Böhler K107 is a high-carbon (2.1%), 12% chromium. 0.7 % tungsten, alloy cold-work tool steel that is used in applications where a very high abrasive wear resistance is needed, but where demands on chipping resistance are small. This datasheet provides information on composition, physical properties, hardness, and elasticity. It also includes information on forming and heat treating. Filing Code: TS-799. Producer or source: voestalpine Böhler Edelstahl GmbH&Co KG.

Microstructure and strength of a tantalum-tungsten alloy after cold rolling from small to large strains

2021 ◽  
Vol 83 ◽  
pp. 34-48
Author(s):  
Guoqiang Ma ◽  
Darcy A. Hughes ◽  
Andrew W. Godfrey ◽  
Qiang Chen ◽  
Niels Hansen ◽  
...  
Keyword(s):  
Cold Rolling ◽  
Tungsten Alloy ◽  
Large Strains
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