| Inclusion Effects on Stress Gage Measurements in Rock and Soil |
01 MAY 84 |
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| Authors:
A. L. Florence; L. E. Schwer; T. Cooper; J. T. Rosenberg; D. D. Keough; SRI INTERNATIONAL MENLO PARK CA
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 | One of the main difficulties in measuring stress in rocks and soils is that the stress gage and installation disturb the stress field to be measured. Another difficulty is to relate the behavior of a sensing foil embedded within a stress gage package to the stress field surrounding the gage. The work reported is the first phase of a combined theoretical and experimental program to investigate problems of in-situ stress ... |
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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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| Lagrange Gage Studies of Nonideal Explosives Containing NH4NO3 |
JUN 1983 |
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| Authors:
M. Cowperthwaite; J. T. Rosenberg; SRI INTERNATIONAL MENLO PARK CA
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| Theoretical and experimental studies of planar detonation waves in Amatex 20 were performed to obtain a better understanding of the role of ammonium nitrate in the detonation process in explosives formulated from RDX, TNT, and AN. The theoretical work was performed to provide a more definitive and realistic treatment of steady-state detonation waves in such composite explosives. The treatment developed for such waves extends the classical Zelodovich-von Neumann-Doering (ZND) model ... |
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| Experimental Study of the Effects of Faults on Spherical Wave Propagation. |
OCT 1979 |
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| Authors:
J. C. Cizek; A. L. Florence; D. D. Keough; J. T. Rosenberg; SRI INTERNATIONAL MENLO PARK CA
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| A laboratory technique has been developed for investigating the effect on a spherical wave of a fault located close to a spherical explosive charge that is detonated to generate the wave. The medium is a grout that simulates tuff, the fault is idealized by Mylar sheets, and the sensor is a particle velocity gage. The gage principle is based on Faraday's law in that a voltage is induced in a ... |
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| Lagrange Gage Studies of Nonideal Explosives Containing NH sub 4 No sub 3. |
OCT 1979 |
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| Authors:
M. Cowperthwaite ; J. T. Rosenberg; SRI INTERNATIONAL MENLO PARK CA
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| Theoretical and experimental studies of nonideal detonation in explosives containing constituents such as RDX and NH4NO3, which react at different rates, are presented in this report. (AUthor) |
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| Deflagrationo-Detonation Transition in HMX-Based Propellants. |
AUG 1979 |
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| Authors:
M. Cowperthwaite ; W. J. Murri ; J. T. Rosenberg; SRI INTERNATIONAL MENLO PARK CA
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| Theoretical and experimental studies were undertaken to explain the mechanisms that establish conditions for the occurrence of the one-dimensional deflagration-to-detonation transition (DDT), and to formulate a satisfactory model for a quantitative description of this transition. The theoretical studies were concerned with the thermo-hydrodynamic treatment of DDT. The central problem is to model the propagation of the unsteady flame and the flow it produces ahead of the flame front. The compressive ... |
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| Deflagrationo-Detonation Transition in HMX-Based Propellants. |
JUN 1978 |
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| Authors:
M. Cowperthwaite; J. T. Rosenberg; SRI INTERNATIONAL MENLO PARK CA
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| Research on the deflagration-to-detonation transition (DDT) is important to the Air Force because many of the energetic propellants required for present and future long-range delivery systems are explosively filled compositions that are capable of undergoing DDT. HMX-based propellant, for example, usually burns reliably in rocket motors but has detonated and destroyed the motor on several occasions. Possible steps leading to detonation in the rocket motor are fracture of propellant ahead ... |
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| In Situ Constitutive Relations of Soils and Rocks. Spherical Field Tests and LASS Results for Pre-Dice Throw II Materials. LASS Error Propagation Analyses. |
APR 1977 |
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| Authors:
J. T. Rosenberg; P. S. De Carli; d. g. falconer; D. D. Keough; SRI INTERNATIONAL MENLO PARK CA
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| For several years, SRI has been measuring the dynamic mechanical response of in situ geologic materials near and above the elastic limit. A major achievement has been development of the LASS technique (Lagrange Analysis for Stresses and Strains), in which a mathematically complete Lagrange flow analysis is used to calculate dynamic stress-strain trajectories from field measurements of explosive-induced ground motion. Two fields shots were fired to provide data for proof ... |
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| In Situ Constitutive Relations of Soils and Rocks. |
AUG 1976 |
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| Authors:
J. T. Rosenberg; C. W. Smith; D. R. Curran; SRI INTERNATIONAL MENLO PARK CA
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| Current results of an ongoing SRI program to determine dynamic in situ stress-strain response at field sites are presented. The method used was the LASS technique (Lagrange analysis for stresses and strains). In this technique field measurements of radial stress and particle velocity histories induced by explosive loading are combined with a numerical analysis to solve the governing partial differential flow equations for the desired stress and strain trajectories. The ... |
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| Characterization of the Dynamic Behavior of Porous Solids. Volume 5. Dynamic Response of Porous Beryllium - Experiments. |
MAR 1976 |
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| Authors:
J. T. Rosenberg; M. J. Ginsberg; D. R. Curran; STANFORD RESEARCH INST MENLO PARK CALIF
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| Planar-impact gas gun experiments were performed to investigate the dynamic mechanical response of nonsintered plasma-sprayed distended beryllium (PSDB) shock-loaded to stress levels below full compaction. Stress-time profiles were obtained at several depths in each PSDB target, using in-material ytterbium gages. A Lagrangian analysis was applied to the stress histories to produce dynamic stress-volume paths. PSDB was shown to undergo irreversible compaction at stress levels as low as 4 kbar, and ... |
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| Dynamic Properties of Rock Required for Prediction Calculations. |
NOV 1974 |
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| Authors:
C. F. Petersen; J. T. Rosenberg; STANFORD RESEARCH INST MENLO PARK CALIF
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| Dynamic loading and unloading curves were measured to 29 kbar in wet and dry tuff from the Nevada Test Site, wet and dry sandstone from the Mixed Company site, and wet soil from the Essex site. The curves were obtained using multiple embedded gages that recorded particle velocity and/or stress histories at up to four different depths in gas gun impact experiments. The Fowles-William analysis method was used to generate ... |
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