This paper considers resolution of the Riemann problem for a van der Waals fluid. The method of an analysis is one of limiting artificial viscosity. Keywords: Connecting orbits; A priori estimates; Theorems.

Topics: DTIC Archive, Slemrod, M, WISCONSIN UNIV-MADISON CENTER FOR MATHEMATICAL SCIENCES, *VISCOSITY,...

The Differential Surface Refractometer, and instrument based on the principles of surface refractometry, and modifications of this instrument as required to extend its usefulness to other glass types, is capable of determining the magnitude of the surface compression, in psi, present on tempered glass by nondestructive means. Since the strength of glass is dependent upon the strength of its surface, this ability to measure the surface compression of tempered glass enables one to assess the...

Topics: DTIC Archive, PITTSBURGH PLATE GLASS CO PA, *GLASS, *REFRACTOMETERS, NONDESTRUCTIVE TESTING,...

An experimental investigation of super-resolution imaging from measurements of projections onto a random basis is presented. In particular, a laboratory imaging system was constructed following an architecture that has become familiar from the theory of compressive sensing. The system uses a digital micromirror array located at an intermediate image plane to introduce binary matrices that represent members of a basis set. The system model was developed from experimentally acquired calibration...

Topics: DTIC Archive, MITRE CORP MCLEAN VA, *COMPRESSIVE PROPERTIES, *IMAGES, *RESOLUTION, ARRAYS,...

We extend our recent work where a screw dislocation in FCC Ni was found to spontaneously attain a low-energy partially cross-slipped configuration upon intersecting a forest dislocation. Using atomistic (molecular statics) simulations with embedded atom potentials, we evaluate the activation barrier for a dislocation to transform from fully residing on the glide plane to fully residing on the cross-slip plane intersecting a forest dislocation. The activation energies were obtained by...

Topics: DTIC Archive, UES INC DAYTON OH, *NICKEL, *ACTIVATION ENERGY, SCREWS, COMPRESSIVE PROPERTIES, CROSS...

Energy absorbing mechanisms in sand subjected to one-dimensional compression are reported. For pressures below crushing of the grains, a granular medium of equal radii elastic spheres in a face-centered cubic array is analyzed. Expressions are obtained for the axial stress-strain curve, constrained modulus, coefficient of earth pressure at rest, and relationship between absorbed energy and input energy for one cycle of loading. The energy absorbed as a result of crushing is considered by...

Topics: DTIC Archive, Hendron, Jr , Alfred J, ILLINOIS UNIV AT URBANA-CHAMAPIGN, *ENERGY, *SAND,...

Static and dynamic one-dimensional compression tests were performed on each of ten 5-inch undisturbed shelby tube soil samples taken from the site of Operation Snowball at the Suffield Experimental Station. The maximum stresses attained were generally in the 390 to 1,300 psi range. The results of the tests are presented in the form of plots of axial stress versus axial strain, constrained modulus versus axial stress, and radial stress versus axial stress. The dynamic modulus observed for the...

Topics: DTIC Archive, DAVISSON (M T) FOUNDATION ENGINEER CHAMPAIGN IL, *SOIL MECHANICS, AIRBURST, CANADA,...

We have developed and applied successfully new algorithms for hyperspectral imagery. These include compressive sensing, anomaly detection, target detection, endmember detection, unmixing and change detection. These were tested on data provided by AFRL with good results, including change detection under different lightning conditions. Ideas involved Bregman iteration applied to L1 and total variation based optimizations were used and also successfully applied to subsampled data. A nonnegative...

Topics: DTIC Archive, LEVEL SET SYSTEMS INC PACIFIC PALISADES CA, *HYPERSPECTRAL IMAGERY, ALGORITHMS,...

This manual provides information and guidance for the investigation and selection of materials, equipment, and methods to be used in chemical grouting in connection with construction projects.

Topics: DTIC Archive, CORPS OF ENGINEERS WASHINGTON DC, *CHEMICALS, *GROUTING, MATERIALS, CONSTRUCTION,...

The report describes the theory for recovering information from sparse signal representations in distributed sensing applications. This theory is useful in streamlining networking and decoding operations over bandwidth constrained wireless networks. Using these results, we can for example transport and store a single combined measurement set, rather than multiple sets from all sensors. We show that via source separation and joint decoding, it is possible to recover information about the...

Topics: DTIC Archive, CREATIVE STEP LLC BELMONT MA, *CLUSTERING, *THEORY, COMMUNICATIONS NETWORKS,...

Equilibrium thermodynamic data are presented for air from a log P of -7.4 to 4.8 and from a temperature of 100 to 15,000K, where P is pressure in atmospheres. These data are tabulated at constant pressure with temperature incremented. The dependent parameters are log H/R, log rho, Z, S/R, H/RT, and Z*. Several sources were used in assembling the data.

Topics: DTIC Archive, Brahinsky, Herbert S, ARO INC ARNOLD AFS TN, *AIR, *THERMODYNAMICS, COMPRESSIVE...

The Workshop began with an intriguing and provocative presentation of experimental work on model LC polymer systems which emphasized the importance of chain segregation according to chain length. The morphological studies set the stage for much debate on molecular origins of compressive failure. A review of Du Pont research on strategies for possible improvement in compressive strength in rigid-rod polymers was presented.

Topics: DTIC Archive, CAMBRIDGE UNIV (UNITED KINGDOM), *POLYMERS, *COMPRESSIVE PROPERTIES, FIBERS, FAILURE,...

The paper is a general study of the role of microstructure on the mechanical properties of high temperature materials. Short time tensile and compression tests, fatigue, creep and thermal strain tests are being performed on metals, principally unidirectionally solidified lamellar eutectics, including the NiCr eutectic, and also on ceramics. The solidification characteristics for various growth conditions and the mechanical properties over the temperature range -250 to 850C have been obtained...

Topics: DTIC Archive, WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA, *HEAT RESISTANT ALLOYS, COMPRESSIVE...

A two year program was initiated on October 1, 1990 to pursue new approaches on improving the compressive properties of polymer based composites. This included work directed at new kinds of reinforcing agents, improved matrices and on the fiber matrix interface. A number of significant breakthroughs were achieved as a result of this study. In the case of the polymer matrix studies sufficient progress was made to justify additional funding and time extensions.

Topics: DTIC Archive, Economy, James, ILLINOIS UNIV CHAMPAIGN, *COMPOSITE MATERIALS, *COMPRESSIVE...

Equilibrium thermodynamic data are presented for argon from a log P of -6.9 to 4.2 and from a temperature of 300 to 35,000K, where P is pressure in atmospheres. These data are tabulated at constant pressure with temperature incremented. The dependent parameters are log H/R, log rho, Z, S/R, H/RT, and Z*. Several sources were used in assembling the data.

Topics: DTIC Archive, Brahinsky, Herbert S, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *ARGON,...

Compression creep and compression constant strain-rate tests were performed on thick wall cylindrical specimens of aluminum alloy 2024-0 at 500F (533K). Using the assumption that the equation of state of the material is a function only of stress, strain, and strain rate, the creep curves were analyzed to yield constant strain-rate, stress strain data. Comparisons between the creep-derived and the directly measured constant strain-rate data show that the data are not exactly equivalent but the...

Topics: DTIC Archive, ALLIED RESEARCH ASSOCIATES INC CONCORD MA, *ALUMINUM ALLOYS, STABILITY,...

The development of our knowledge of the buckling of thin-walled circular cylindrical shells subjected to axial compression is outlined from the beginning of the century until the present, with particular emphasis on advances made in the last twenty-five years. It is shown that practical shells generally buckle under stresses much smaller than the classical critical value derived by Lorenz, Timoshenko, Southwell and Flugge. A first explanation of the reasons for the discrepancy was given by...

Topics: DTIC Archive, STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS, *SHELLS(STRUCTURAL FORMS),...

Feature matching is a key, underlying component in many approaches to object detection, localization, and recognition In many cases, feature matching is accomplished by nearest neighbor methods on extracted feature descriptors This methodology works well for clean, out-of-water images, however, when imaging underwater, even an image of the same object can be drastically different due to varying water conditions. As a result, descriptors of the same point on an object may be completely different...

Topics: DTIC Archive, NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV,...

A variational development of the governing equations and boundary conditions for the bending and buckling of sandwich curved plates and shells is presented. The theory is applicable to sandwich construction of the honeycomb type and may be used to describe bending, buckling, and postbuckling behavior. With the coupled effects of core transverse shear and normal strain included, the theory reflects the presence of 8 degrees of freedom and 2 constraining conditions. Nine boundary conditions per...

Topics: DTIC Archive, Bartelds, Geert, STANFORD UNIV CA DEPT OF AERONAUTICS AND ASTRONAUTICS,...

Equilibrium thermodynamic data are presented for argon from a temperature of 300 to 35,000K and from a log rho of -7.0 to 2.4, where rho is density in amagats. These data are tabulated at constant temperature with density incremented. The dependent parameters are Z, E/RT, H/RT, S/R, log P, and Z*. Several sources were used in assembling the data.

Topics: DTIC Archive, Brahinsky, Herbert S, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *ARGON,...

The experimental and analytical studies indicate that the approximate conventional theory based on limit analysis is quite adequate to predict the static ultimate loads of the underreinforced arches. The dynamic ultimate loads for compression mode loading can also be predicated by approximate theory provided that an appropriate dynamic increase factor (based on the increase in material properties) is used. However, it is not clear whether a satisfactory approximate theory can be developed to...

Topics: DTIC Archive, Gupchup, Vijay N, MASSACHUSETTS INST OF TECH CAMBRIDGE, *STRUCTURAL PROPERTIES,...

Results are described of a numerical study of the initial compressive buckling and post-buckling behaviour of GRP panels reinforced by longitudinal hat-section stiffeners. Particular reference is made to the effects of interaction between local buckling of the panesl laminate and overall, column-like buckling involving bending of the stiffeners. Conclusions are reached regarding the influence of interactive effects on collapse strength and recommendations are made on allowance for these effects...

Topics: DTIC Archive, Smith,C S, ADMIRALTY RESEARCH ESTABLISHMENT DUNFERMLINE (SCOTLAND), *BENDING,...

Equilibrium thermodynamic data are presented for air from a temperature of 100 to 15,000K and from a log rho of -7.0 to 3.0, where rho is density in amagats. These data are tabulated at constant temperature with density incremented. The dependent parameters are Z, E/RT, H/RT, S/R, log P, and Z*. Several sources were used in assembling the data.

Topics: DTIC Archive, Brahinsky, Herbert S, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *AIR,...

Almost all the solutions in the literature of viscoelastic stress analysis have dealt with materials which exhibit viscoelastic behavior in shear but are incompressible or elastic in dilatation. This has been influenced in part by the fact that accurate measurement of viscoelastic characteristics in dilatation are difficult to make, and only now are preliminary results becoming available. Since more precise measurement of dilatational response can be expected, certain solutions of viscoelastic...

Topics: DTIC Archive, Huang, N C, STANFORD UNIV CA DIV OF ENGINEERING MECHANICS, *VISCOELASTICITY,...

Equilibrium thermodynamic data are presented for air from an S/R of 13.2 to 133.0 and from a temperature of 100 to 15,000K, where S/R is dimensionless entropy. These data are tabulated at constant entropy with temperature incremented. The dependent parameters are log rho, log P, log H/R, gamma sub E, A/AA, Z, H/RT, and Z*. Several sources were used in assembling the data.

Topics: DTIC Archive, Brahinsky, Hervert S, ARO INC ARNOLD AFS TN, *AIR, *THERMODYNAMICS, COMPRESSIVE...

Compressive sampling strategies using image-space modulation for polarization and spectral data cube reconstruction and interferometric subsampling for coherence measurement were demonstrated. Compressive millimeter wave imaging systems were demonstrated using the common mathematical and physical analysis framework. A new design for multiscale wide aperture high resolution telescopes was developed. The new approach may combine image plane compression with parallel multiscale cameras to enable...

Topics: DTIC Archive, DUKE UNIV DURHAM NC, *IMAGE COMPRESSION, COMPRESSIVE PROPERTIES, HIGH RESOLUTION,...

Previously a static Multi-Modulus technique was described for the simultaneous determination of Young's and bulk moduli on a single specimen of a polymeric material. Additional data have now been accumulated. These fit the same pattern as the early data and further substantiate the validity of the Multi-Modulus technique for measuring the fundamental elastic properties of polymers.

Topics: DTIC Archive, Warfield, R W, NAVAL ORDNANCE LAB WHITE OAK MD, *POLYMERS, ELASTIC PROPERTIES,...

Room temperature tensile and compressive true stress-true strain curves of various high strength steels (quenched and tempered 4340 steel, 410 martensitic stainless steel and H-11 steel; and aged 300-grade 18 Ni maraging steel) were analyzed to determine the effect of the various microstructures on what has been termed the strength differential (SD), i.e., the strength level difference between the tensile and compressive flow curves.

Topics: DTIC Archive, Chait, Richard, ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MA, *STEEL,...

An experimental study was made of the influence of material properties of the directly transmitted effects on explosions. Small spherical high-explosive charges were used to load a series of cylindrical blocks of fine aggregate concrete, either at the surface of a block, with in a block, or at the contact surface of two blocks. Measurements were made of the variations in concrete properties, of the total impulse delivered to the block supports, of the permanent deformations and craters, and of...

Topics: DTIC Archive, Kaplan, Kenneth, UNITED RESEARCH SERVICES CORP BURLINGAME CA, *COMPRESSIVE...

As part of the TRIDENT effort in the general area of ocean environment, the literature data on electric conductivity, compressibility, and viscosity of sea water have been reviewed and collected. These physical properties affect such processes as galvanic corrosion, the operation of sea- return cables, and the performance of seawater-activated batteries. Although experimental values are not available over the full range of temperatures, pressures, and concentrations encountered in the oceans,...

Topics: DTIC Archive, LITTLE (ARTHUR D) INC CAMBRIDGE MA, *SOLUTIONS(MIXTURES), *ELECTRICAL CONDUCTIVITY,...

The set of hydrodynamic equations together with Maxwell's equations which describe a nonuniform plasma as formulated by Cohen was applied to a two dimensional problem where the magnetic field has only one component which is transverse to the direction of propagation and the profile is of the form (e exp. -Bx). These assumptions lead to a set of second order coupled electromagnetic and hydrodynamic differential equations which describe the region under consideration. Solutions to this coupled...

Topics: DTIC Archive, Rahneberg, Eric, ARIZONA UNIV TUCSON ENGINEERING EXPERIMENT STATION,...

Compressive sensing has been used in many imaging domains to facilitate high quality reconstruction from under-sampled data. This work presents a new reconstruction algorithm for use with under-sampled digital holography measurements and yields reconstruction quality far superior to conventional backpropagation methods. The report describes the new dictionary prior and its use in an iterative soft thresholding algorithm and presents systematic studies of performance versus various physical...

Topics: DTIC Archive, ARIZONA UNIV TUCSON, *DIGITAL IMAGES, *DIGITAL SYSTEMS, *HOLOGRAPHY, ALGORITHMS,...

Specific volume, isothermal compressibility, and thermal expansion of Baker db-grade castor oil have been computed from an empirical equation fitted to data obtained by the differential transformer densitometer technique. Data is presented over a temperature range of 0-40C and a pressure range of 1-1000 bars.

Topics: DTIC Archive, NAVAL ORDNANCE LAB WHITE OAK MD, *VEGETABLE OILS, COMPRESSIVE PROPERTIES, PRESSURE,...

A program to explore the behavior of ATJ-S graphite under multiaxial stress states is described. The program includes biaxial tests, off-axis uniaxial tests, and the development of a triaxial test capability. The first phase of the program is to conduct fracture tests on specimens of ATJ-S graphite under biaxial stress states at room temperature and 2000F at low strain rates. The biaxial tests consist of simultaneous axial loading and internal pressurization of hollow cylindrical specimens. The...

Topics: DTIC Archive, Jortner, Julius, MDDONNELL DOUGLAS ASTRONAUTICS CO-WEST SANTA MONICA CA, *STRESSES,...

Laboratory tests were performed on samples of paddy and laterite soils obtained from the proposed right-of-way of the Rangoon-Mandalay Highway, Burma. These tests were conducted to determine the basic engineering properties of the soils and to evaluate the feasibility of stabilizing these soils with lime and cement. The addition of lime to these soils had little beneficial effect on either soil. This was due to the non-reactive nature of the soils and the poor stabilizing quality of the lime...

Topics: DTIC Archive, Schomaker, Norbert B, CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN IL,...

The hypothesis of plastic incompressibility, which is pivotal in the development of the classical theory of plasticity was tested by means of a series of simple tension tests on aluminum, copper and low carbon steel. The experimental measurements show conclusively that these metals are plastically compressible, the compressibility increasing with straining in the plastic region. A new phenomenon, termed lateral instability, was also observed, consisting in an abrupt plastic flow in the...

Topics: DTIC Archive, Valanis, K C, IOWA UNIV IOWA CITY DEPT OF MECHANICS AND HYDRAULICS, *STEEL, *COPPER,...

Although it has been generally accepted that compressive stress adversely affects the fluorescent penetrant indications of fatigue cracks, published supporting data was lacking. To begin to fill this data void, five titanium specimens containing low cycle fatigue cracks were repetitively processed with a standardized liquid penetrant procedure after known stresses had been applied. A fixture was designed to apply known amounts of compressive stress on the cracked surfaces over the range of 0 to...

Topics: DTIC Archive, Brausch, John C, UNIVERSAL TECHNOLOGY CORP DAYTON OH, *CRACK PROPAGATION,...

The factors in the testing of very brittle materials which can prevent the true strength from being realized are identified. An externally pressurized, closed end, cylindrical specimen is used to attain 2:1 biaxial compression. The first of a series of planned tests has been performed and 585, 000 psi was measured for the 2:1 biaxial compressive strength of an alumina. This is 31% higher than the uniaxial compressive strength. A description of the testing equipment is given. Two analyses are...

Topics: DTIC Archive, Sines, George, CALIFORNIA UNIV LOS ANGELES SCHOOL OF ENGINEERING AND APPLIED SCIENCE,...

An analysis is made of the analogy between schemes for integrating the equations of motion of a compressible fluid, in Lagrangian coordinates, and molecular models of matter. Computation schemes involving one and two independent variables are considered, for flows with and without shocks.

Topics: DTIC Archive, Birkhoff, Garrett, LOS ALAMOS NATIONAL LAB NM, *SHOCK WAVES, *COMPRESSIBLE FLOW,...

A theory of thin plates under large deformations is developed that is both kinematically and physically non-linear. It is used to analyze the strength of a single-wall fiberboard element modeled as a composite plate structure. Either an elastic-type instability or a comrpession failure mode is allowed. Results are used to explain how to adjust facing and medium thickness to maximize edgewise compression strength per board weight. (Author)

Topics: DTIC Archive, Johnson,Millard W , Jr, FOREST PRODUCTS LAB MADISON WIS, *FIBERS, *FIBERBOARD,...

Glen Canyon Dam, located on the Colorado River in northern Arizona, is a gravity-arch dam containing 5 million cubic yards of concrete. The concrete in the dam proper contains a pozzolanic material as a replacement for a portion of the cement. A preliminary pozzolan investigation, reported in Concrete Laboratory Report No. C-882, evaluated, for coupliance with requirements of Specifications No. DS-5053, pozzolans from 74 sources. Selected pozzolans from these sources that met all specifications...

Topics: DTIC Archive, Graham, J R, BUREAU OF RECLAMATION DENVER CO, *CEMENTS, COMPRESSIVE PROPERTIES,...

This report examines the dependence of the ballistic performance of silicon carbide on the third invariant of the stress tensor by use of numerical simulations and test data. The JHB ceramic model is modified to account for the influence of the third invariant, and the modification includes a material parameter defined as the ratio of yield in tri-axial extension to yield in tri-axial compression. Simulations of high-velocity impact are performed systematically with several values of the...

Topics: DTIC Archive, SOUTHWEST RESEARCH INST MINNEAPOLIS MN, *SILICON CARBIDES, BALLISTICS, CERAMIC...

The purpose of the investigation was to make a preliminary evaluation of a proprietary, rapid-setting, cementitious material for possible use by the Corps of Engineers, especially in the repair of elements of construction in marine exposures. The investigation involved an evaluation of the basic properties of the material by petrographic and X-ray diffraction examination and chemical analysis. Physical tests for time of setting, compressive strength or cubes at 1 hr, 24 hr, 7 days, and 28 days,...

Topics: DTIC Archive, Saucier, Kenneth L, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS,...

The report documents the results of a limited number of static and dynamic tests on one tuff from the location of the Diamond Mine Event tunnel at the Nevada Test Site. The tests comprised the first experimental study conducted in the then newly developed dynamic high-pressure triaxial test device. The purpose of the study was to determine loading rate effects on the uniaxial strain, hydrostatic compression, and triaxial shear response of that tuff when loaded statically (approximately 2...

Topics: DTIC Archive, Ehrgott, John Q, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS, *ROCK,...

Tables for the thermodynamic properties of equilibrium air are presented at intervals of log rho = 0.2, the density rho in amagats extending from 1 to 1000 amagats and at temperature intervals of 100 deg from 300 to 6000K. In accordance with full discussion in the text of the report, the compressibility factor Z at 300 and 400K is extrapolated to 1000 amagats by linear extrapolation of log (Z - 1) against log rho at constant temperature. At 5000 and 6000K the values of Z were obtained from...

Topics: DTIC Archive, Grabau, Martin, ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN, *AIR,...

Equilibrium thermodynamic data are presented for nitrogen from a temperature of 100 to 15,000K and from a log rho of -7.0 to 3.0, where rho is density in amagats. These data are tabulated at constant temperature with density incremented. The dependent parameters are Z (compressibility factor), E/RT, H/RT, S/R, log P, and Z*. Several sources were used in assembling the data.

Topics: DTIC Archive, Brahinsky, Herbert S, ARO INC ARNOLD AFS TN, *NITROGEN, *THERMODYNAMICS, COMPRESSIVE...

The report presents the results of a series of tests made on shells which buckled plastically. It is shown that nonsymmetric patterns can be developed. These appear to be nonextensional in character. They are very similar to the Yoshimura pattern which occurs as the bending case for thin shells.

Topics: DTIC Archive, Horton, W H, STANFORD UNIV CA, *SHELLS(STRUCTURAL FORMS), BUCKLING, COMPRESSIVE...

A flat strip antenna is embedded in a planar dielectric slab, which is surrounded on both sides by layers of compressible isotropic electron plasma. Several closed form expressions are obtained for the impedance with a sinusoidal current distribution along the antenna. The antenna impedance is computed numerically when considering the perturbations of the antenna current by surface waves. Except for thin plasma layers, the antenna impedance can be computed using the same current distribution as...

Topics: DTIC Archive, SYLVANIA ELECTRONIC SYSTEMS-EAST WALTHAM MA APPLIED RESEARCH LAB, *ANTENNAS, *PLASMA...

Difficulties have been encountered in reproducing sufficiently similar dry unit weights (within plus or minus 0.3 pcf) in 1.4-in.-diam triaxial test specimens of cohesive soil compacted using the spring-loaded Harvard miniature compactor. In an effort to alleviate these difficulties, a tamper was made which maintained a constant force on the compacting foot by air pressure acting on a rolling diaphragm. It is designated as the 'modified Berkeley pneumatic tamper.' Calibration and operation...

Topics: DTIC Archive, MacIver, Bruce N, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS, *SOIL...

Tensile and compressive tests under pressure were performed on specimens of sintered poly crystalline tungsten and beryllium. Results are presented as reduction in area versus pressure. A brittle-ductile field is mapped for tungsten from available data. Correlative fluid extrusions were performed on sintered poly crystalline tungsten and beryllium, and on a single crystal of beryllium. There were indications that crack-free fluid-to-fluid extrusions should be possible for all materials, with...

Topics: DTIC Archive, PRESS WIRELESS MFG CO INC WEST NEWTON MA, *BERYLLIUM, *TUNGSTEN, *COMPRESSIVE...

Extruded and centrifugally cast nylon, representative of current projectile obturator band materials, were tested in compression at static and dynamic loading rates. The high strain rates associated with the dynamic compression test (2600 in./in./min) resulted in significantly higher yield and compressive strengths, but only a minimal (8%) increase in elastic modulus. Elastic constants for both materials were measured using the ultrasonic pulse- echo method, and the results show good agreement...

Topics: DTIC Archive, Smith, Mark T, BATTELLE PACIFIC NORTHWEST LABS RICHLAND WA, *DEFORMATION, *NYLON,...