| High Energy Missile Project |
DEC 2004 |
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| Authors:
Jacques Dubois; Pierre Lafrance; Richard Lestage; Frank Wong; Francois Lesage; Dennis Nandlall; Paul Harris; Rocco Farinaccio; Pierre Lessard; Marc Lauzon; Marc Chateauneuf; Robert Stowe; Nicolas Hamel; DEFENCE RESEARCH AND DEVELOPMENT CANADAVALCARTIER (QUEBEC)
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 | In the search for increasing the lethality and survivability of light armored vehicles a small hypervelocity missile concept has been investigated. This research and development project called High Energy Missile (HEMi) technology demonstrator aimed at studying and demonstrating the key technologies to achieve the appropriate lethality to defeat modern main battle tanks at long range in a lightweight missile. The HEMi concept is described and a review of the supporting ... |
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| Safe, Compact Nuclear Propulsion: Solid Core Nuclear Propulsion Concept |
OCT 88 |
310 pages |
| Authors:
Jack H. Ramsthaler; Gerry Farbman; Paul Harris; Tal Sulmeisters; EG AND G IDAHO INC IDAHO FALLS
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 | The NERVA nuclear rocket engine was compared to an advanced nuclear electric engine as well as an advanced chemical engine for use in orbital transfer, and lunar and Mars missions. The NERVA stage had advantages over the chemical stage in payload, life cycle cost, and propellant consumption. The NERVA stage also had lower mission time requirements and life cycle cost compared to the nuclear electric stage. Fabrication of the NERVA ... |
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| Two Shock Wave Physics Problems: The Macro-Micro Coupling Term and Shock Amplification in Piezoelectric Media |
NOV 1982 |
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| Authors:
Paul Harris; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB
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| Problem 1: The transfer of momentum from internal (microscopic) to center of mass (macroscopic) coordinates is considered for a system of nonuniform mass density and typical internal coordinates. First order averaging over the mass density is shown to lead to an internal variable contribution to the center of mass velocity proportional to time to the fourth power (in the t goes to 0 limit) and proportional to the square of ... |
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| Comparison of the Optical Reflectivity of a Shock Front in Liquid Water and in Liquid Nitromethane |
NOV 1982 |
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| Authors:
Paul Harris; Henri-Noel Presles; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB
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| Shock front optical reflectivity data for liquid water at 5.8 kbar and for liquid nitromethane at 6.0 kbar are analyzed with a reflectivity theory containing reflection within the shock front. Comparison of the analyses for water and for nitromethane leads to the conclusion that additional physics is necessary to explain the nitromethane data. It is suggested that the experimental-theoretical discrepancy for nitromethane is optical-path-length dependent, and that discrepancy is possibly ... |
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| The Shock Front Rise Time in Water |
18 JUN 1982 |
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| Authors:
Paul Harris; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ
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| This paper reports on successful shock front optical reflectivity theory and experiment for water at 5.8 kbar (0.58 GPa), and complimentary shock induced electrical polarization experiment and theory for the pressure range 20 kbar to 100 kbar. The LCWSL - Universite de Poitiers program has experiments performed in France (funded by the Commission Nationale Recherche Scientique), while the ILIR program within the LCWSL funds the theoretical work. The consistent interpretation ... |
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| Shock Front Rise Time in Water |
OCT 1981 |
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| Authors:
Paul Harris; Henri-Noel Presles; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB
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| A review is made of the present status of the experimental- theoretical program for the evaluation of the shock front thickness in water, and the results of recently performed hyperbolic tangent shock front structure calculations are presented. The hyperbolic tangent results, when compared with experimental data, predict a shock front thickness upper limit of 6.2 X 10 to the minus 6th power cm at 5.8 kbar. Experiments and theory planned ... |
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| The Response of Germanium to Large Amplitude Shock Waves. |
JUN 1979 |
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| Authors:
Paul Harris; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB
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| A tentative explanation for the first two (50 kb and 120 kb) experimentally observed shock wave transitions in single crystal germanium is presented. Calculations are carried out which suggest that the 120 kb transition is associated with the ductile yielding upon collapse of the conduction band onto the valence band (i.e., a semiconductor-metal transition without an associated transformation of the crystal structure). Arguments are also given which lead to the ... |
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| Stability and Amplification of Shock Waves. |
DEC 1978 |
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| Authors:
Paul Harris; ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND DOVER NJ LARGE CALIBER WEAPON SYSTEMS LAB
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| The concept of shock wave instability leading to shock pressure amplification is investigated with respect to materials properties and thermodynamic equilibrium. It is concluded that a materials property requirement (negative macroscopic Grueneisen parameter) associated with single-pass pressure amplification is inconsistent with the amplifying medium being in a state of thermodynamic equilibrium. A resulting interpretation, for inert media, is that such amplifying states are metastable and only to be found in ... |
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| weak-shock transmission coefficient via harmonic generation |
JUN 77 |
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| Authors:
Paul Harris
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| the problem of stress transmission across a boundary separating acoustically linear and nonlinear media is treated to the first order in the nonlinearity (third-order elastic constant). the study is carried out by considering the role of harmonic generation in the nonlinear medium. an application considered is that of extending low- (but finite) amplitude ultrasonic measurements to the high-pressure regime (e.g. 10 kbar) in sensitive materials such as explosives. (author) ... |
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| Shock Wave Induced Structural Phase Transformations. |
DEC 1976 |
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| Authors:
Paul Harris; PICATINNY ARSENAL DOVER N J
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| Shock induced structural phase transformations, for two military motivated problems, are considered. Structural transformations in metallic alloys (e.g. TiNi) are examined from both macroscopic and microscopic (soft phonon mode) viewpoints. Both viewpoints are found to be consistent with the possibility of growth (avalanching) of the amplitude of a transformation inducing propagating shock wave. The relationship between such avalanching and the design considerations for an optically activated detonator is treated. The ... |
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| Some Physics Relevant to Acoustic (Shock Wave) Impedance Calculations. |
OCT 1975 |
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| Authors:
Paul Harris; PICATINNY ARSENAL DOVER N J
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| The problem of energy transmission across a boundary separating acoustically linear and nonlinear media is considered to third order in the strain (third order elastic constant). The study proceeds via the contribution of the first harmonic (the input signal being the fundamental) to the stress tensor. It is concluded that the nonlinearity introduces a correction of approximately a few percent (for most crystalline materials), at ten kilobars input amplitude, in ... |
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| Thermoelasticity in Exothermic Media. |
JUN 1974 |
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| Authors:
Paul Harris; PICATINNY ARSENAL DOVER N J
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| Phenomenological arguments are given which result in the identification of Chapman-Jouget criteria with a corresponding thermal wave velocity/elastic wave velocity criteria in thermoelasticity. Inert gases and solids are then examined quantitatively, and it is shown that the introduction of exothermic effects can lead to the thermoelastic criteria being satisfied. Linearized exothermic perturbations are introduced into the thermoelastic equations, and those equations are analyzed. In particular it is shown that exothermic ... |
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| Electromechanical Shock Waves. |
JUL 1973 |
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| Authors:
Paul Harris; PICATINNY ARSENAL DOVER N J
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| The existing experimental data pertaining to electromechanical shock effects in metals is reviewed. It is shown that the so called 'anomalous thermoelectric power' experiments, and the simpler metallic sandwich experiments, are basically geometry variants of the same experiment. A theoretical model is presented which is based upon interacting electron and ion fluids. In the model each fluid is capable of supporting its own shock structure, and the 'shock' velocity is ... |
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| Some Physics of the Gruneisen Parameter. |
SEP 1972 |
39 pages |
| Authors:
Paul Harris; Louis Avrami; PICATINNY ARSENAL DOVER N J
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| The physics of the Gruneisen parameter for solids is investigated from the view of conceptual and physical contributions. The relatively simple physics of a van der Waal's gas is applied to solid densities yielding a Gruneisen gamma approximately equal to 2. The separate electron and phonon contributions for metals are considered, and it is shown that except for very high and very low temperatures the phonon contribution dominates. Procedures for ... |
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| A Fluid-Mechanical Formulation of the Problem of Thermomechanical Instability in Energetic Media. |
MAR 1972 |
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| Authors:
Frank Crowne; Paul Harris; PICATINNY ARSENAL DOVER N J
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| Thermomechanical instabilities in reactive media are examined first from a thermodynamic viewpoint, where certain ranges of temperature, pressure or density are considered 'unstable' which can be arrived at from the second law of thermodynamics and assumptions about the way heat is released into the fluid. It is then shown that this criterion for instability can be derived from the hydrodynamic equations, and that a substance which satisfies the criterion will ... |
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| The Gruneisen Constant of Porous Materials in Energy Deposition Materials. |
AUG 1971 |
28 pages |
| Authors:
Paul Harris; PICATINNY ARSENAL DOVER N J
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| It is proposed that the usual energy deposition, e.g., electron beam, experiments, as well as the usual shock introduction, e.g., flyer plate, experiments do not yield a true Gruneisen parameter of porous materials. It is proposed that in a porous material stress relief occurs within the time that energy is being deposited, or before the final state is reached in a flyer plate experiment. Both types of experiments are analyzed ... |
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| CANONICALLY CONJUGATE VARIABLES FOR THE FINITE STRAIN PROBLEM, |
31 MAY 1967 |
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| Authors:
Paul Harris; NAVAL ORDNANCE LAB WHITE OAK MD
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| Internal position-like variables are derived for phonons, and for electrons in a crystalline lattice. The derivation proceeds by considering departures from translational invariance. The importance of such internal variables is discussed. Advice is given to experimentalists in the area of measuring the electron current dragged along by the mechanical shock. |
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| ON THE POSSIBILITY OF A PRECURSOR MEMORY EFFECT IN CRYSTALLINE SOLIDS, |
16 SEP 1966 |
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| Authors:
Paul Harris; NAVAL ORDNANCE LAB WHITE OAK MD
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| A simple qualitative model is developed for the existence of a precursor memory effect. By using our model we investigate Taylor's prediction of a memory in Armco iron and conclude that his theory leading to the memory prediction is incomplete in that it neglects viscous effects occurring in the precursor shock front region and plasticity contributions to the stress. When such effects are incorporated into the theory the amount of ... |
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| ON A MECHANISM FOR THE SHOCK POLARIZATION OF DIELECTRICS, |
17 JUL 1964 |
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| Authors:
Paul Harris; NAVAL ORDNANCE LAB WHITE OAK MD
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| A simplified account is given of a mechanism which it is hoped will explain the shock polarization of nonpiezoelectric dielectrics. The mechanism invokes a shock induced breakdown of the symmetry which is characteristic of non-piezoelectrics. The conclusion reached is that a polarization is developed which is proportional to the gradient of the stress. Consequently the entire voltage drop is predicted to lie across the shock front under open circuit conditions. ... |
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| ELASTIC WAVE DECAY II, |
FEB 1964 |
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| Authors:
Paul Harris; NAVAL ORDNANCE LAB WHITE OAK MD
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| A time dependent non-linear formulation of shock propagation in an originally isotropic medium is presented. It is postulated that such a formulation accounts for the known non-linearity of the dissipative mechanisms which result in the decay of elastic waves in crystalline solids. By combining this non-linear theory with the appropriate conservation equations, characteristics and characteristic equations are derived which explicitly contain dispersion and decay in terms of unknown functions of ... |
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| ELASTIC WAVE DECAY, |
22 JUL 1963 |
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| Authors:
Paul Harris; NAVAL ORDNANCE LAB WHITE OAK MD
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| A microscopic viscosity approach is applied to the problem of attenuating elastic waves in solids having straight dislocations lying in energy wells biased by the applied shear stress. This model is found to be lacking. From analogy with ultrasonic attenuation, a more appropriate model based upon the loss mechanism applicable to the so-called Fatigue range of ultrasonics is proposed. The question of the shock front thickness associated with the decaying ... |
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| SHOCK WAVES, DISLOCATIONS, AND THEIR INTERACTIONS, |
04 APR 1963 |
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| Authors:
Paul Harris; S.J. JACOBS; NAVAL ORDNANCE LAB WHITE OAK MD
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| THE EXISTING ACROSCOPIC ELASTIC-PLASTIC THEORY IS DEVELOPED IN A HOPEFULLY SIMPLE MANNER. Those aspects of the theory which are of special im portance to shock propagation in solids, and which relate to the microscopic extension of the theory, are treated in length. The 'hydro dynamic' equations are written in the elastic plastic spirit and should be usable by an experi mentalist regardless of the exact microscopic processes involved. A gross ... |
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Reports by Author
