| Determination of the Yield Strength of a Molybdenum Jet |
MAR 1998 |
84 pages |
| Authors:
Miles L. Lampson; Richard L. Summers; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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 | The strength of the metal in a shaped charge jet influences its length at breakup, its penetration rate into a target, and its ability to resist aerodynamic forces in flight. The response of a jet to an imposed centrifugal force can be used to estimate its yield strength. Copper was the first metal studied by this technique, and the strength determined by Karpp using a hoop model was approximately 100 ... |
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| The Particulation of a Shaped Charge Jet for Face-Centered-Cubic Liner Materials |
APR 93 |
55 pages |
| Authors:
William P. Walters; Richard L. Summers; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| An analytical model was derived to predict the breakup time distribution and the strain at breakup of the jet from a shaped charge liner. The model invoked a plastic stability criterion, kinematic considerations, and the Zerilli-Armstrong constitutive model for face-centered-cubic liner materials. The model revealed excellent agreement with experimental data for several liner geometries but is strongly dependent on the jet temperature distribution as well as the initial strain rate.... ... |
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| The Velocity Difference Between Particulated Shaped Charge Jet Particles for Face-Centered-Cubic Liner Materials |
NOV 92 |
44 pages |
| Authors:
William P. Walters; Richard L. Summers; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A model was derived to predict the average jet velocity difference between particulated shaped charge jet particles. The model is based on the 'wire drawing formula presented by Kolsky, the plastic instability criterion, and the Zerilli-Armstrong constitutive equation for face-centered-cubic materials. The velocity difference expression is strongly dependent on the jet temperature and weakly dependent on the jet strain rate. Calculations were also made using the Johnson-Cook constitutive model. The ... |
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| Computer-Aided Analysis of Flash X-Ray Films |
SEP 92 |
49 pages |
| Authors:
Richard L. Summers; Kipp C. Wright; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The shaped charge jet free-flight experiment is an extremely valuable diagnostic in the shaped charge design process. A semiautomated method is discussed for the digitization of a particulated jet's position and shape from the x-ray film image into electronic storage files, which provides the experimentalist with an efficient basis for data reduction. With the aid of a microcomputer, one can generate a wealth of information concerning the pertinent jet characteristics. ... |
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| A 1-MeV Flash X-Ray Shaped-Charge Test Facility |
OCT 90 |
18 pages |
| Authors:
Carl V. Paxton; Richard L. Summers; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| The Ballistic Research Laboratory has installed four channels of 1- MeV Hewlett Packard flash x-ray pulsers at Experimental Research Facility 16. ERF 16 is a shaped-charge research facility devoted to the study of the collapse, formation, and growth of jets from shaped-charge liners, as well as the interaction of shaped-charge jets with various target designs. The 1-MeV test site use both a blow-away film holder to study liner collapse and ... |
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