Eighteen adhesively bonded aluminum coupons were tested on a vibration shaker at room temperature to determine the effects of varying the adhesive type/thickness, primer and adherend surface preparation on their random bending fatigue life. Most of the fatigue failures occurred within one million to one billion cycles, all at 900 microstrain. While neither the primer thickness nor the surface treatment seemed to influence the overall results, the coupons with thicker adhesive had a noticeable...
Topics: DTIC Archive, Wolfe, Howard F., AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH,...
A simple lumped capacitance-resistance model is used to simulate heat flow in a residential size structure heated passively by the sun. The model takes the form of an analogous electrical circuit. A computer program was written to analyse the circuit. By altering the input parameters of the program, the thermal performance of a wide variety of passive solar designs can be investigated for any geographical location. By comparing program generated data to data taken from experimental test cells...
Topics: DTIC Archive, Slate,Mitchell Perry, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF...
This report contains the test results and raw fractographic data for over 180 fatigue cracks. Natural fatigue cracks were acquired in fastener holes in 7475-T7351 aluminum. Three specimen fastener hole configurations were considered: (1) open hole, (2) bolt-in-hole(passive), and (3) bolt load transfer. Both straight-bore and countersunk fastener holes were considered. Strain survey results for a double-reversed dog-bone specimen(designed for 15% bolt load transfer) are presented. The...
Topics: DTIC Archive, Gordon, D E, GENERAL DYNAMICS FORT WORTH TX FORT WORTH DIV, *CRACKING(FRACTURING),...
An investigation of metallurgical improvements and repair procedures to extend the service life to F404 high pressure turbine blades has been conducted. The first phase of the investigation was directed towards the evaluation of directionally solidified Rene'80H superalloy specimens and blades and has been previously published. In the study reported herein, the elevated temperature creep-rupture properties of single crystal Rene'N4 specimens were determined and compared to the creep properties...
Topics: DTIC Archive, Smith, Hugh H, NAVAL RESEARCH LAB WASHINGTON DC, *TURBINE BLADES, *SUPERALLOYS,...
A centrifugally cast A356 aluminum-matrix composite reinforced with silicon carbide (SiC) particles was thermo-mechanically processed by rolling and the resulting properties were studied. Tensile testing, hardness testing and optical microscopy were conducted. This study included evaluations of the mechanical properties of the composite following rolling at varying strains, temperature, strain per pass and aging treatments. The effects of both single and multi-step rolling processes were...
Topics: DTIC Archive, Muller, Kurt A, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *TENSILE PROPERTIES,...
Several new materials capable of generating large strains under an electric field are being developed for applications as actuators and high-drive sonar projectors. These materials are capable of generating strains which are several times larger than those produced by conventional lead zirconate-titanate ceramics. The first group of materials are the class of lead magnesium niobate- lead titanate (PMNPT) ceramics. These materials are electrostrictive and, therefore, are operated under dc bias...
Topics: DTIC Archive, Rittenmyer, Kurt M, NAVAL RESEARCH LAB ORLANDO FL UNDERWATER SOUND REFERENCE...
This is the first quarterly report of a project aimed at determining the reliability of electronic interconnects made with Sn-3.5wt%Ag solder alloy. The reliability of solder interconnects is primarily determined by two factors: (1) the type of electronic assembly; and (2) the environment to which the assembly is exposed. These two factors (each composed of several variables i.e. assembly thermal expansion coefficients, elastic moduli of assembly members, maximum operating temperature, rate of...
Topics: DTIC Archive, Raeder, C H, RENSSELAER POLYTECHNIC INST TROY NY, *LASERS, *RELIABILITY, *SILVER,...
The influence of strain rate on the tensile deformation and fracture behavior of powder-fabricated titanium and nickel containing porosity has been investigated. Measurements of the uniform strain, local fracture strains, and elongations to failure show that, over the range of strain rates from 0.0001 to 100 per 1/sec, there is little or no effect of the strain rate on the fracture behavior of these materials at any of the porosity levels studied. In contrast, increasing porosity causes...
Topics: DTIC Archive, Magnusen, P. E., MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF METALLURGICAL...
The resistance to shear instability and subsequent flow localization in ultrahigh strength (UHS) steels is dependent upon second-phase particle dispersions and the matrix strain hardening. The effect of the interparticle spacing (lambda) to the geometric mean particle radius (R) ratio on the shear instability strain of UHS 4340 steel is discussed. Experimental results indicate a linear relationship exists between shear instability strain and this lambda/R ratio. Microvoid nucleation softening...
Topics: DTIC Archive, Cowie, John G, ARMY LAB COMMAND WATERTOWN MA MATERIALTECHNOLOGY LAB, *HIGH STRENGTH...
The object of this paper is to provide a critical review of the current state of plasticity in the presence of finite deformation. In view of the controversy regarding a number of fundamental issues between several existing schools of plasticity, the areas of agreement are described separately from those of disagreement. Attention is mainly focussed on the purely mechanical, rate-independent, theory of elastic-plastic materials, although closely related topics such as rate-dependent behavior,...
Topics: DTIC Archive, Naghdi, P M, CALIFORNIA UNIV BERKELEY DEPT OF MECHANICAL ENGINEERING, *PLASTIC...
By any number of measures the 1992 Gordon Research Conference on Point Defects, Line Defects and Interfaces in Semiconductors was very successful. The Gordon conference organization evaluates all of its conferences by means of a questionnaire to all participants. Our conference was ranked 20 out of 134 conferences held during the summer of 1992. This is especially good for a field that is so mature. Good choices of discussion leaders and speakers were key to this success. Speakers from related...
Topics: DTIC Archive, Cruickshank, Alexander, GORDON RESEARCH CONFERENCES INC KINGSTON RI, *INTERFACES,...
This project has concentrated almost entirely on non-convex minimization problems in nonlinear elasticity theory and the existence of deformation-induced microstructure under severe loading conditions. As the microstructure develops and becomes more dense with increasing loads, the material weakens and the body has a softer response. Our minimizing sequences predict this property. To complement our theoretical development, a large scale FEM code was implemented on the CM-200 machine. This code...
Topics: DTIC Archive, Fosdick, Roger L, MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND...
Raman scattering measurements have been performed on semiconductor- insulator nanocomposites in which the semiconducting phase occupies a significant (30%) volume fraction. The composites have been synthesized by high pressure injection of the conducting melt into the nanochannels of commercially available insulating matrices. The optical phonon spectra of GaSb- and Te-SiO, composites exhibit shifts, broadenings, and asymmetries when compared to those of the semiconducting bulk. These are...
Topics: DTIC Archive, Yang, W H, HOWARD UNIV WASHINGTON DC LASER CHEMISTRY DIV, *COMPOSITE MATERIALS,...
A hybrid experimental-numerical procedure was used to analyze the micro-mechanics of the mixed-mode, static and dynamic fracture of a concrete three-point bend specimen with an offset precrack. Four/two beam moire interferometry was used to record simultaneously separating horizontal and vertical displacements associated with stable/rapid growth. An elasto-static/ elasto-dynamic finite element code was execute in its propagation mode with assumed crack closure stress (CCS) versus crack opening...
Topics: DTIC Archive, Yu, Chang-Te, WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING, *CONCRETE,...
An analysis is made of the normal handling that a microelectronic package is likely to encounter. The stresses and deformations of the lids and bases of a rectangular flat-pack caused by the accidental dropping of the package onto a floor from a height of a few feet, are assessed theoretically. The results of the study shows that the assumed normal handling conditions constitutes a severe environment which is capable of producing stress that will buckle a metallic lid or crack a ceramic lid or...
Topics: DTIC Archive, Libove,Charles, SYRACUSE UNIV NY DEPT OF MECHANICAL AND AEROSPACE ENGINEERING,...
Electric resistance strain gauges were fitted to the hull of a heavy landing craft in an attempt to assess the effectiveness of modifications designed to strengthen the hull. Contrary to all predictions, the values of strain induced by loading the ship were extremely small, while those induced in the hull by various thermal effects were relatively large. No really useable data was obtained from the tests. (Author)
Topics: DTIC Archive, Gee,S W, AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA), *STRAIN(MECHANICS), *SHIP...
A two-dimensional finite-difference Eulerian hydrocode (HELP) and a two-dimensional finite-element Lagrangian code (EPIC-2) were used to measure response characteristics of a long steel rod with a hemispherical nose impacting a rolled homogeneous armor target at 0 deg obliquity and at an ordnance velocity. Surface strains were computed at three positions along the steel rod and these results were compared with published experimental data wherein the measuring devices were strain gages mounted...
Topics: DTIC Archive, Misey, J J, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *COMPUTERIZED...
The cyclic thermal shock resistance of several outer air, gas-path seal systems for high-pressure turbines was evaluated. In all these systems, plasma-sprayed, yttria-stabilized zirconium dioxide was the ceramic constituent. The most promising approaches were those that had a porous-metal, low-modulus pad as a strain isolator between the ceramic layer and the dense metal substrate. Cooling pins extending into the low-modulus pad significantly reduced the oxidation rate of the porous metal and...
Topics: DTIC Archive, Bill,Robert C, NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS...
This report presents data obtained in a four point bend experiment on a 105 mm M68 rotary forged gun tube. The four point bending was accomplished using a standard hydraulic straightening press fitted with a two point loading device designed and fabricated by the Benet Weapons Laboratory Engineering Support Branch. Strains were measured at several points on the surface in a circumferential plane using standard foil type resistance gages and standard strain readout equipment. Deflections at...
Topics: DTIC Archive, Milligan, R V, ARMY ARMAMENT RESEARCH AND DEVELOPMENT CENTER WATERVLIET NY LARGE...
The effect of sub-T (g) aging on the properties of an epoxy resin system, diglycidyl ether of butanediol, DGEB, cured with 4-4' diaminodiphenyl sulfone, DDS, has been studied. Aging was found to increase the DSC endothermic peak, the density and the upper field point, In contrast, the lower yield point was relatively unchanged. This result, together with the observation of the elimination of the DSC endothermic peak by deformation and the absence of a yield point after deformation suggested...
Topics: DTIC Archive, Chang,T -D, NORTHWESTERN UNIV EVANSTON IL MATERIALS RESEARCH CENTER,...
The objectives of the study program were to define and verify a synthesis of strength-limiting parameters for fatigue cracked panels which would be applicable to the wide range of conditions of interest in the engineering problem of strength analysis and to present this synthesis in a form that would lead to a better conceptual understanding of the interaction between parameters. The program consisted of an analytical study and a supporting experimental study. The analytical study, governed by...
Topics: DTIC Archive, Walker, E K, NORTHROP CORP HAWTHORNE CA NORAIR DIV, *AIRCRAFT PANELS,...
Experimental strains and load-line deflections of C-shaped fracture- toughness test specimens are reported as functions of load and increasing crack depth. It is shown that the variation in strain at the outer surface may be used as an indicator of fatigue crack growth for evaluating the critical load in fracture toughness tests. The stresses and load-line deflections are compared with theoretical values calculated for the uncracked specimens. Their relation to the stress intensity factor of...
Topics: DTIC Archive, Fujczak, R., Throop, J., WATERVLIET ARSENAL NY, *FATIGUE(MECHANICS), *CRACK...
A finite-element model is proposed which allows for both straining within each element and slip between two elements. Basic equations are derived and are shown to almost completely uncouple into two constituent components: the conventional finite-element equations for continuous displacement fields and the 'slip' equations which were recently derived for a model based on slipping of rigid triangles. The model is applied to the Prandtl punch problem and is shown to combine the best features of...
Topics: DTIC Archive, Hodge,Philip G , Jr, MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND...
Additional microyield measurements on HIP-50 beryllium samples, subjected to a variety of selected heat treatments, were performed. It was determined that of the several treatments that were employed the most significant increase in the value of the microyield strength occurred from a 100 hour exposure to 600 C. A microyield value of about 26.5 klb/sq in. was measured after this treatment compared to an as-received value of 17.2 klb/sq in. Examination of the microyield data plotted on...
Topics: DTIC Archive, Kumar,K, CHARLES STARK DRAPER LAB INC CAMBRIDGE MA, *THERMAL STABILITY, *GYROSCOPES,...
Ti-6Al-4V plates were spin-forged into hemispheres so that the effect of the spinning process on plastic strain anisotropy could be examined. Spinning temperatures were varied from 400 to 1725F, and plastic strains in the longitudinal and transverse directions were measured. The plastic strain anistropy and texture developed by spin-forging were similar to those produced by other forms of processing and resulted in texture strengthening at low spinning temperatures.
Topics: DTIC Archive, Amateau, Maurice F, AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS, *METAL SPINNING,...
Described are methods used to screen commercially available yarns for ballistic applications. The techniques used include low and high strain rate tensile tests, determination of longitudinal strain wave speed of propagation as a function of strain level, and measurement of transverse critical velocity, the only ballistic test used. In the tensile tests, the yarn modulus and strength generally increase and the elongation decreases as the strain rate increases. The strain wave speed of...
Topics: DTIC Archive, Claus, Jr , W D, FABRIC RESEARCH LABS INC DEDHAM MA, *ARMOR, *BALLISTICS, *YARNS,...
Uniaxial, biaxial, and triaxial compressive tests were conducted on cubical test specimens cast and brought to small dimensional tolerances. The primary purpose of the tests was to determine if the test-to-test variation could be reduced by using the carefully prepared test cubes. The test to test variation was reduced using the specially prepared cubes. The results obtained from these tests were compared to the results obtained in the primary testing program. The initial tangent modulus from...
Topics: DTIC Archive, Endebrock, Elton G, NEW MEXICO STATE UNIV LAS CRUCES, *CONCRETE, *TEST METHODS,...
Stress and strain profiles have been recorded in targets impacted by long-rod kinetic-energy projectiles. Stress gauge records were strongly influenced by the strain field in the target, so compensating strain measurements were used to derive the correct stress profile. Strain-compensated stress gauges in the projectile path measured stress which increased to a value that remained nearly constant until penetration neared the gauge. This constant stress was close to the value of the Hugoniot...
Topics: DTIC Archive, Pritchard, Dennis S, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *KINETIC...
The Marciniak and Kuczynski (M-K) analysis, which associates localized necking in sheet metal with pre-existing imperfections, has been modified such that the imperfection or groove is inclined (rather than normal) to the major principal strain axes. The analysis, which is closely related to the calculations of Hutchinson and Neale, takes into account the requirement for localized necking that a direction of zero-extension is inclined for strain states between uniaxial tension and plane strain....
Topics: DTIC Archive, Chan,K S, MICHIGAN TECHNOLOGICAL UNIV HOUGHTON DEPT OF METALLURGICAL ENGINEERING,...
This report documents and gives example runs of three computer programs for performing settlement analysis of foundations and embankments. The programs are I0016, MAGSETII, and FD31. Program I0016 determines vertical stresses beneath footings and embankments. MAGSETII was written to calculate the magnitudes of settlement of multilayered soil systems. FD31 was developed to determine time-settlement relationships for cohesive soils due to large uniformly distributed loads.
Topics: DTIC Archive, Mosher,Reed L, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS, *COMPUTER...
Document describes procedures for measuring dynamic strains that occur during weapon firing and vehicle tests, when the principal direction of the strain is known. It includes the use of foil and wire resistance strain gages.
Topics: DTIC Archive, ARMY TEST AND EVALUATION COMMAND ABERDEEN PROVING GROUND MD, *MEASUREMENT,...
Computer codes used in the solution of free-field ground shock problems are based on mathematically defined constitutive models. Quantitative input for these constitutive models is primarily based on laboratory test data, but extensive analysis and numerous assumptions are required to convert these data to a form suitable for actual code input. This report presents a detailed illustration of the analyses involved in deriving the soil constitutive properties required for a specific code...
Topics: DTIC Archive, Jackson, Jr, John G, ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS, *SOILS,...
An experimental and computational analysis was made of the strain field around a reinforced circular hole in four HMF330/34 graphite/epoxy (G/Ep) panels under uniaxial tensile loading. The basic panel was a 10.0 in. wide, 26.0 in. long, eight ply, quasi-isotropic (0/+45/90)s cloth laminate. Each panel was reinforced during manufacture by co-curing two circular plies of the same material to each side of the panel. A circular one inch hole was drilled concentrically through the laminate to...
Topics: DTIC Archive, Pickett,D H, NAVAL POSTGRADUATE SCHOOL MONTEREY CA, *Composite materials, *Graphited...
Uniaxilly stretched Nylon-11 films (obtained by melt-pressing and quenching in ice-water, were poled up to 900 KV/cm at 75 deg C for 30 min. Both piezoelectric strain constant, d sub 31, and piezoelectric stress constant, e sub 31, were found to increase with poling fields. The values reach a plateau at fields of 800 KV/cm. Under identical poling conditions (500 KV/cm; 75 deg C) d sub 31 was found to be approx. 25% greater than that observed for unoriented films in previous studies while the...
Topics: DTIC Archive, Mathur,S C, RUTGERS - THE STATE UNIV PISCATAWAY NJ DEPT OF MECHANICS AND MATERIALS...
The theory of small superposed deformation for isotropic incompressible elastic materials is used to obtain necessary restriction on the form of the strain-energy function by requiring that the speed of propagation be real for waves that pass through a finitely deformed body of material (i.e., Hadamard stability criterion), and to determine critical loading conditions for a thick rectangular plate under which bifurcation solutions (i.e., adjacent equilibrium positions) can exist. The...
Topics: DTIC Archive, Sawyers,K N, LEHIGH UNIV BETHLEHEM PA CENTER FOR THE APPLICATION OF MATHEMATICS,...
The launch and recovery portion of a launch survival test on a Type T, 155-mm Cannon Launched Guided Projectile (CLGP) warhead was conducted. This test employed the Large Caliber Soft Recovery System (LCSRS). The warhead body was adapted for this test by attaching a forward water scoop and a base structure. These components were necessary for launch from a 155-mm howitzer and recovery in the LCSRS. The projectile system was instrumented with a FM/FM telemetry system to measure base pressure,...
Topics: DTIC Archive, Evans, James W, ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD, *RECOVERY,...
During the past year our research has been concerned principally with the synthesis by MBE of InxAl(1-x)As/InP heterojunctions in strained layer structures (SLS). Some of the layers were grown with their lattice constants matched to that of their (100)-oriented InP substrates. Others were chosen deliberately to be in compression or in tension and with appropriate combinations of their fractional indium concentration, x, and thickness, d, were intended to be strained pseudomorphically or...
Topics: DTIC Archive, Wieder, H H, CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF ELECTRICAL AND COMPUTER...
This thesis addresses the vertical wavenumber frequency (m, omega) distribution of vertical shear and strain in the upper ocean. Part of the data set includes measurements from a newly-developed pulse-to-pulse coherent sonar. Chap. 2 discusses its design and performance. Chap. 3 investigates the effects of zooplankton distribution on Doppler sonars which use small ensonified volumes. A secondary data set of isopycnal vertical displacement (eta) was collected with a profiling CTD system....
Topics: DTIC Archive, Sherman, Jeffrey T, SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA MARINE PHYSICAL...
The electrostrictive actuator and nonresonant transducer capabilities of relaxor ferroelectrics have been of practical interest for the last decade. Displacement transducers from materials which have large elecrostrictive effects are advantageous for several reasons: (1) The field-induced deformations (strains) are more stable than in piezoelectric ceramics (relaxation processes are minor and they do not evidence aging from macrodomain-defect interactions), (2) Hysteresis in the strain-field...
Topics: DTIC Archive, PENNSYLVANIA STATE UNIV UNIVERSITY PARK MATERIALS RESEARCH LAB, *TEMPERATURE,...
Various damages, which develop in structural composites, cause a softening behavior which can cause significant load redistribution in non-critical as well as critical areas of various structural elements. The strain energy dissipation (SED) concept provides a set of consistent nonlinear constitutive relations for stress analyses and the in-plane loader (IPL) provides a way for material characterization. Damage surfaces for moderate values of dissipated energy densities (DED) were estimated to...
Topics: DTIC Archive, Chatterjee, Sailendra N., MATERIALS SCIENCES CORP FORT WASHINGTONPA, *COMPOSITE...
Topics: DTIC Archive, Geil, G W, NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD, *STEEL, *PLASTIC PROPERTIES,...
This report contains viewgraphs that investigate the effects of loading conditions on crack growth behavior in a particulate composite materials under confining pressure. The loading conditions that were observed were 1) Constant strain rate : 5.8 cm/cm/min; 2) Constant strain: 12%, 15% and 18%; 3) Confining pressures: Ambient pressure and 6897 Kpa.
Topics: DTIC Archive, Liu, C T, AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE, *STRAIN RATE,...
Results are presented of an experimental polarimetric technique to measure strain in opaque objects. Experiments were conducted utilizing metamaterials on polydimethylsiloxane (PDMS) sheets to produce strain-induced birefringence at terahertz frequencies. Preliminary measurements are encouraging and show a qualitative agreement with theoretical predictions.
Topics: DTIC Archive, Everitt,Henry O, ARMY AVIATION AND MISSILE RESEARCH DEVELOPMENT AND ENG CTR REDSTONE...
This document is a user's guide to the SINGER computer program. The guide defines the form and interpretation of input and output data. SINGER predicts the transient response of two dimensional reinforced concrete frames subjected to time varying loadings, accounting for nonlinear material effects and large geometry changes.
Topics: DTIC Archive, Melosh, R J, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CIVIL AND...
This document presents test problems which are intended to demonstrate the ability of SINGER to predict the response of plane frames and rings, including geometrically and physically nonlinear behavior, subject to static and dynamic actions. The following special features are illustrated: Inelastic behavior of a cantilever beam, discretization of an elastic ring under uniform pressure, large deformations of an elastic beam, and inelastic cyclic motion of a rod. The quality of the response...
Topics: DTIC Archive, Barker, R M, VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF CIVIL AND...
Fatigue life estimation of helicopter dynamic components is a complex process that is currently achieved through many different methods. The objective of this study was to review existing methods and to develop a standardized method that could be used by the Army for reliably predicting operational life. This report presents results of a detailed review of fatigue life methods used by five helicopter manufacturers as determined by site visits and literature reviews. Recommendations for a...
Topics: DTIC Archive, Ryan, John P., Berens, Alan P., Coy, Richard G., Roth, George J., DAYTON UNIV OH...
A steady-state vibrating object is illuminated with coherent light and its image is slightly misfocused in the film plane of a camera. The resulting processed film is called a time-integrated specklegram. When the specklegram is Fourier filtered, its exhibits fringes depicting derivatives of the vibrational amplitude. The direction of the spatial derivative, as well as the fringe sensitivity may be easily and continuously varied during the Fourier filtering process. Besides the above mentioned...
Topics: DTIC Archive, Hovanesian,J D, OAKLAND UNIV ROCHESTER MICH SCHOOL OF ENGINEERING, *VIBRATION,...
An effort is described to find a relation between measured stress difference at 4 Kbar as determined by uniaxial strain tests and other material properties for NTS area 12 tuff. No useful relationship was found. (Author)
Topics: DTIC Archive, Duff,Russell E, SYSTEMS SCIENCE AND SOFTWARE LA JOLLA CALIF, *STRESS ANALYSIS,...
A spherical containment device to be used for the safe transportation of high explosives was evaluated for its ability to suppress blast effects from internal explosive detonations of charge weights extending to 483 gms (17.03 oz. ) of 50/50 pentolite explosive. The device consisted of a steel sphere with a specially designed port to permit the placement of high explosive material inside. In a series of tests, charges of different weights were detonated inside the device. Overpressure...
Topics: DTIC Archive, Jackson, Willis F., ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD,...
Results of drained and undrained, triaxial compression and extension, and thick-walled cylinder laboratory tests are given for a laboratory prepared kaolin soil. For the soil in question, a portion of the data is used to calibrate a 'bounding surface plasticity model' for cohesive soils. The model is used to analyze the remaining tests and the results are compared to the measured values with good agreement. (Author)
Topics: DTIC Archive, Herrmann, L. R., CALIFORNIA UNIV DAVIS DEPT OF CIVIL ENGINEERING, *SOIL TESTS,...
