| Computational Model for Armor Penetration |
OCT 87 |
218 pages |
| Authors:
D. C. Erlich; L. Seaman; D. R. Curran; D. A. Shockey; R. D. Caligiuri; SRI INTERNATIONAL MENLO PARK CA
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 | Results are reported from the second year of a three-year BRL/AMMRC/ SRI program to develop a computational capability for predicting the behind-the- armor fragment environment for spaced armor attacked by long-rod penetrators. The baseline materials chosen were rolled homogenous steel armor (RHA) and depleted uranium (DU) for the penetrator. Phenomenological studies involving both quarter and full-scale ballistics tests at velocities up to 1.5 km/s and obliquities from 0 to 70 ... |
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| Computational Model for Armor Penetration |
OCT 87 |
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| Authors:
D. C. Erlich; L. Seaman; T. Cooper; R. D. Caligiuri; D. R. Curran; SRI INTERNATIONAL MENLO PARK CA
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 | This is the first volume of a two-volume series comprising the third annual report for the program Computational Model for Armor Penetration. The objective of the program was to develop a phenomenologically sound material disintegration model for computationally simulating armor penetration by projectile impact. The model would provide the capability to predict the ballistic limit and downrange fragment size and velocity distributions and would eventually be used by the DoD ... |
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| Computational Model for Armor Penetration |
OCT 1987 |
147 pages |
| Authors:
D. C. Erlich; L. Seaman; D. A. Shockey; SRI INTERNATIONAL MENLO PARK CA
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| Results are reported from the first year of a three-year joint BRL(AMMRC/SRI program to develop a computational capability to predict the behind-the-armor fragment environment for spaced armor attacked by long rod penetrators. The materials chosen for study were depleted uranium- and tungsten- alloy penetrators, rolled homogeneous armor, and an electroslag-remelt-treated steel armor. Phenomenology experiments indicated that adiabatic shear banding is the dominant microstructural failure mode underlying target plugging and fragmentation ... |
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| Simulation Development for Silo Test Program (STP). Volume 2. Detonation Characterization of NA/NP (Aqueous Nitric Acid/Nitropropane) and NPN (nitropropane Nitrate) |
31 MAR 84 |
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| Authors:
J. T. Rosenberg; D. C. Erlich; D. D. Keough; SRI INTERNATIONAL MENLO PARK CA
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| In support of the Defense Nuclear Agency (DNA) Silo Test Program, the planar steady detonation processes were characterized and initial JWL (Jones- Wilkins-Lee) equation of state (EOS) coefficients were developed for two chemical high explosives (HEs), NA/NP and NPN. NA/NP is a liquid explosive composed of weak (Baume 42) aqueous nitric acid (NA) and the solvent nitropropane (NP). The NA/NP studied here was 3.158 parts NA to 1 part NP, ... |
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| Short Pulse Fracture Mechanics, |
OCT 1983 |
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| Authors:
D. A. Shockey; J. F. Kalthoff; H. Homma; D. C. Erlich; SRI INTERNATIONAL MENLO PARK CA
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| A research effort was begun eight years ago at SRI International to analyze the response of a crack struck by a short-lived tensile pulse and to modify static fracture mechanics concepts to allow predictions of dynamic crack instability. The results of this work, which have been presented in a series of papers over the past six years, comprise a unified extension of classical fracture mechanics and are summarized here. We ... |
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| Particle Impact Damage in Ceramics. |
MAR 1981 |
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| Authors:
D. A. Shockey; K. C. Dao; D. C. Erlich; R. L. Burback; D. R. Curran; SRI INTERNATIONAL MENLO PARK CA
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| Impacts of tungsten carbide spheres on Si3N4 produced elastic fracture behavior (ring and cone cracks) at room temperature, but elastic-plastic fracture behavior (plastic impressions and radial cracks) at 1400 C. In contrast, no change in fracture pattern at the two temperatures was produced by impact with steel spheres. These results may be explained by the relative abilities of the impacting spheres to cause plastic flow at the impact site and ... |
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| Development and Application of a Computational Shear Band Model. |
MAR 1980 |
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| Authors:
D. C. Erlich; L. Seaman; D. A. Shockey; D. R. Curran; SRI INTERNATIONAL MENLO PARK CA
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| A computational shear band model has been developed and used to predict the fragmentation response of explosively-loaded cylinders and munitions. The model is based on the physical processes occurring in the material that lead to fragmentation, as observed in experiments in which the fragmentation process was stopped at various stages of development. Good agreement was obtained between measured and computed fragment size distributions for two widely different steels, which suggests ... |
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| Further Development of a Computational Shear Band Model. |
MAR 1980 |
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| Authors:
D. C. Erlich; D. R. Curran; L. Seaman; SRI INTERNATIONAL MENLO PARK CA
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| Experimental and analytical work was performed to improve the computational model for adiabatic shear band nucleation and growth (SNAG). A series of contained fragmenting cylinder experiments were performed with 4340 steel treated to hardness of R sub c 40, R sub c 52, and R sub c 21. The resulting damage ranged from homogeneous plastic deformation to extensive shear banding and resulting fragmentation. The results showed strong positive correlation between ... |
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| Characterization of the Dynamic Behavior of Porous Solids. Part 6. Dynamic Response of Porous Ceramics-Experiments. |
MAR 1976 |
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| Authors:
D. C. Erlich; D. R. Curran; SRI INTERNATIONAL MENLO PARK CA
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| High pressure dynamic stress wave experiments were performed on sintered alumina of several initial porosities and the multiple Lagrangian gage technique was used to record stress and particle velocity histories at several locations within the specimen in order to calculate the constitutive loading and unloading paths. We now have a family of such paths (shown in Figure 10) that can be used to construct an equation-of-state surface for a predictive ... |
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