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[Crime-related Artifacts display cases]

Description: Photo of two separate display cases in the Special Collections & Archives reading room of Kent State University. Inside are two smaller collections under the umbrella group "Crime-related Artifacts". On the left are pieces of Staffordshire Pottery, which includes the figurines of murderers. On the right are lithographic plates and large metal medallions that are part of the Souvenir Plates & Medallions collection. A group of attendees visited the archives on the first day of the 49th annual CSLA conference that was held at Kent State University from June 27-29 in 2016.
Date: July 27, 2016
Creator: Hartsock, Ralph
Location Info:
Partner: UNT Libraries Special Collections

[Two souvenir plates on display]

Description: Photo of two lithographic souvenir plates on display in the reading room of Kent State University Special Collections. They are part of the Crime-related Artifacts collection. The one on the left depicts a prisoner in front of a judge saying "Mr. Le Judge me cite deux temoins qui m'ont vu moi je lui en citreai plus de mille qui ne m'ont pas vu.", meaning "His Honor cites me two witnesses who saw me; but I will cite more that a thousand of them who didn't see me." The one on the right shows a man standing in front of an empty safe with hands on his head. The legend reads "Ou est le cassier?", meaning "Where is the cashier?" A group of attendees visited the archives on the first day of the 49th annual CSLA conference that was held at Kent State University from June 27-29 in 2016.
Date: July 27, 2016
Creator: Hartsock, Ralph
Location Info:
Partner: UNT Libraries Special Collections

Design of a uniaxial load creep testing machine

Description: The design of a uniaxial load creep machine for testing small scale metallic structures such as beams, plates and thin-walled cylinders is described. A special drum device introduced first by Hart is utilized to achieve step loading during creep tests. Some proof test results on four-point bending beams at room temperature are presented. It is noted that the specimen temperature can be controlled within a +-0.2/sup 0/C fluctuation. Measurements of displacements exhibited creeplike behavior in the range of loads and times considered.
Date: May 1, 1977
Creator: Chang, K. J. & Lance, R. H.
Partner: UNT Libraries Government Documents Department

Capillary liquid evaporation from wick covered plates: theory

Description: Differential equations and associated parameters are derived for heat transfer to a thin liquid-saturated wick, as in the evaporator section of a ''heat pipe.'' Prescribed are a numerical method of solution and a procedure for experimental measurements of heat transfer in the flat plate model. This effort is a part of the Project CLEER program which is currently sponsored by the Mechanical Engineering Department research account.
Date: June 2, 1969
Creator: Van Sant, J. H.
Partner: UNT Libraries Government Documents Department

Bauschinger effect in uranium. [Rarefaction waves]

Description: The Bauschinger effect (different elastic-plastic behavior upon unloading) was measured in uranium and a model of the effect developed for use in one-dimensional hydrodynamic codes. Results from plate-impact tests show that rarefaction waves in uranium can be calculated more accurately with this model. We conclude that the Bauschinger effect can be an important aspect of rarefaction waves in uranium and other materials. 8 figures. (auth)
Date: March 17, 1976
Creator: Cochran, S. G. & Guinan, M. W.
Partner: UNT Libraries Government Documents Department

Fatigue crack morphology in 304 stainless steel cycled at constant stress amplitude. [Nucleation and propagation modes]

Description: A study is made to determine which modes of nucleation and propagation are operating during elevated temperature fatigue of 304 stainless steel. Cracks are nucleated at coarse slip bands, and microstructural features such as inclusions and grain boundaries are not important either as sites of initiation or as obstacles to propagation. One of the major effects of stress amplitude is that the number of cracks nucleated increases rapidly in part because increasing the stress amplitude increases the number of grains which contain coarse slip bands, but there is sufficient data to determine if the crack density increases simply in proportion to the slip-band density or if the slip bands also become more intense and more likely to nucleate cracks at the higher stress amplitudes. The increased density of cracks appears to have significant consequences for the crack propagation process because link up of independently nucleated cracks becomes a prominent mode of propagation along the surface at the higher stress amplitudes. The process of crack linkup may not have had a large effect on the fatigue life of the specimens used in this study because the distance between independent nucleation sites on the fracture surface was never less than about a third of the critical crack size even at the highest stress amplitudes. However, this mode of propagation could have a large effect on the crack propagation portion of the fatigue life of large components, particularly when they have large surface area to volume ratios like plates and pipes.
Date: January 1, 1977
Creator: Turner, A. P. L.
Partner: UNT Libraries Government Documents Department

Product from variability in the mechanical behavior of type 304 stainless steel at room temperature and 593/sup 0/C (1100/sup 0/F)

Description: Data are presented that describe the variability of 15 products of a reference heat of type 304 stainless steel tested in the laboratory reannealed condition: chemistry hardness, grain size, yield strength at room temperature, tensile curves at 593/sup 0/C (1100/sup 0/F), and creep-rupture curves to 1000 h at 593/sup 0/C (1100/sup 0/F). The standard deviation, representing the variation in the yield strength of the 15 products about the average, is near+-l.7 MPa at room temperature and +-6.3 MPa at 593/sup 0/C (1100/sup 0/F). The 1000-h rupture strength varies by 2.5 percent (approximately +-6.2 MPa) from the average and the stress to produce a minimum creep rate of 0.01 percent/h by 3.0 percent (approximately +-5.0 MPa). Variation of strength in the primary creep range is also examined. It is observed that the 25-mm plate is fairly representative of the product average. Reasons for variability are examined: carbon content, nitrogen content, grain size, temperature control, and extensometer performance. 7 tables, 5 figures.
Date: January 1, 1976
Creator: Swindeman, R. W.; McAffee, W. J. & Sikka, V. K.
Partner: UNT Libraries Government Documents Department

Elevated-temperature benchmark tests of simply supported beams and circular plates subjected to time-varying loadings

Description: This report presents the measured elastic-plastic-creep responses of eight simply supported type 304 stainless steel beams and circular plates that were subjected to time-varying loadings at elevated temperature. The tests were performed to provide experimental benchmark problem data suitable for assessing inelastic analysis methods and for validating computer programs. Beams and plates exhibit the essential features of inelastic structural behavior; yet they are relatively simple and the experimental results are generally easy to interpret. The stress fields are largely uniaxial in beams, while multiaxial effects are introduced in plates. The specimens tested were laterally loaded at the center and subjected to either a prescribed load or a center deflection history. The specimens were machined from a common well-characterized heat of material, and all the tests were performed at a temperature of 593/sup 0/C (1100/sup 0/F). Test results are presented in terms of the load and center deflection behaviors, which typify the overall structural behavior. Additional deflection data, as well as strain gage results and mechanical properties data for the beam and plate material, are provided in the appendices.
Date: August 8, 1977
Creator: Corum, J. M.; Richardson, M. & Clinard, J. A.
Partner: UNT Libraries Government Documents Department

Applications of the probability table method to practical problems. [Suitability of ALICE code]

Description: The objective of using the probability table method (PTM) was to use a continuous-energy Monte Carlo code in which the cross sections are given as multigroup constants and yet to account for self-shielding within each group. In order to achieve this objective, the PTM was extended to deterministic methods. The ALICE Monte Carle Neutron Transport Code uses the PTM for all 175 energy groups which span the energy range from thermal to 20 MeV. The TART, ALICE, and MCN codes were used to determine the critical radius of a sphere of UH/sub 3/, where the U/sup 235/ enrichment varied from 20 to 100%. The PTM was used to calculate the transmission through a 30 cm iron plate. The source was normal to the slab and distributed as 1.0/E from 20.0 MeV to 1 keV. For the problems investigated the ALICE code can calculate both shielding and criticality problems as accurately as the pointwise code MCN. 1 figure, 1 table. (RWR)
Date: July 1, 1977
Creator: Plechaty, E. F.; Cullen, D. E. & Levitt, L.
Partner: UNT Libraries Government Documents Department

Mechanical behavior of materials and structural elements at elevated temperatures. Progress report, June 1, 1975--May 31, 1976

Description: Research performed between June 1, 1975 and May 31, 1976 on the mechanical behavior of materials and structural elements at elevated temperatures is summarized. The analytical portion of the research performed includes solutions of several boundary value problems for structural components subjected to steady loads with and without steady thermal gradients using Hart's constitutive relations for the material. Study of crack propagation in a ductile material has been initiated. The experimental portion of the research, designed to perform creep experiments on structural components at room and elevated temperatures, has been started. Hardware is being built and measuring equipment is being purchased.
Date: May 1, 1976
Creator: Lance, R. H. & Mukherjee, S.
Partner: UNT Libraries Government Documents Department

Mechanical behavior of materials and structural elements at elevated temperatures. Progress report, June 1, 1976--May 31, 1977

Description: The analytical research performed includes solutions of boundary value problems for several structural elements using Hart's constitutive relations with and without the presence of anelastic strains. Research is in progress on the use of boundary-integral equation methods to solve inelastic deformation problems for planar bodies. The design and fabrication of a creep testing facility with auxilliary force, temperature and displacement transducers and data acquisition system is complete and creep experiments on beams at room temperature are in progress.
Date: May 1, 1977
Creator: Lance, R. H. & Mukherjee, S.
Partner: UNT Libraries Government Documents Department

Project CLEER: A study of the heat transfer characteristics of a capillary wetted surface

Description: An experimental program (Project Cleer) was initiated to investigate the heat transfer characteristics of a surface covered with a wick-like material and cooled by a capillary liquid. The preliminary heat transfer analyses developed and the measuring equipment and methods to be used are discussed. (LCL)
Date: May 14, 1968
Creator: Van Sant, J. H.
Partner: UNT Libraries Government Documents Department

Plane stress calculations with a two dimensional elastic-plastic computer program. [HEMP]

Description: In the study of ductile fracture it is useful to simulate fracture on the computer under plane stress conditions. In general, this is a three dimensional problem. Presented here is a method for adapting a two dimensional elastic-plastic computer program to calculate problems in plane stress as well as plane strain geometry. A simulation of a tension test of a flat aluminum plate pulled to failure is calculated with the modified two dimensional program. The results are compared with a fully three dimensional calculation. Finally a comparison is made with an experiment to demonstrate the effectiveness of the computational methods for studying fracture of work hardening materials.
Date: April 5, 1976
Creator: Wilkins, M. L. & Guinan, M. W.
Partner: UNT Libraries Government Documents Department

Investigation of a perfusion impaction dust separator

Description: Collection efficiency of an impaction dust separator with a porous plate as the impaction surface was investigated theoretically and experimentally. To provide continuous removal of deposited material, water perfused through the plate in a direction opposite to the impaction direction. The determination of theoretical collection efficiencies as a function of particle and jet properties was attempted by analyzing the governing equations. Experimental collection efficiency was measured for an aerosol jet of organic liquid particles in air.
Date: September 26, 1975
Creator: MacWilliam, G. L.; Gutierrez, F. & Lee, A. S.
Partner: UNT Libraries Government Documents Department

Stabilization of short-wavelength disturbances in the Rayleigh--Taylor instability of plastic solids by a surface layer of high yield strength

Description: The mechanical effects of a thin surface layer in reducing the growth of the Rayleigh-Taylor instability of a plastic solid plate is investigated by representing the surface layer as an elastic plate of high yield strength and high bonding strength to the plastic. This plate may be either the surface layer itself or a composite material formed by interactions of the surface layer with the solid surface layers. In this approximation it is found under wide ranges of conditions that short-wavelength disturbances are stabilized in linear approximation. In this limit the ''gravitational'' energy increment of the displaced plastic solid is overcome by the elastic shear energy of the stretched plate. Long-wavelength disturbances are very weakly affected by this mechanism. For a plastic plate of approximately 1-cm thickness subjected to a pressure difference of approximately 100 kbar we expect wavelengths shorter than lambda/sub c/ approximately 10/sup -1/ cm to be effectively stabilized by this mechanism.
Date: March 1, 1977
Creator: Mjolsness, R. C.
Partner: UNT Libraries Government Documents Department

Transient analysis of a two-dimensional plate by numerical and analytical techniques

Description: An exact analytical solution is used for comparison with three wave-codes. The computer wavecodes employed in the comparison were HONDO, TOODY, and THREEDY. HONDO is a two-dimensional code based on the Galerkin finite element method in a time differenced form; TOODY is a two-dimensional code based on the von Neumann-Richtmyer, artificial viscosity, finite difference method; and THREEDY is a three-dimensional code based on the operator splitting method. Referring the error to a dimensionless L/sub 1/ norm, at a point in the plate, and for two transit times the errors found were as follows: Implicit THREEDY, .1315; TOODY, .0800; HONDO, .0671; explicit THREEDY, .0569.
Date: January 1, 1977
Creator: Norwood, F. R.; Hicks, D. L. & Madsen, M. M.
Partner: UNT Libraries Government Documents Department

Low enrichment fuel conversion for Iowa State University

Description: This report discusses the UTR-10 reactor at Iowa State University which went critical on low enriched uranium (LEU) fuel on August 14, 1991. However, subsequent to the criticality experiments the fuel plates started to discolor. In addition, roll pins used to lift the fuel assemblies were discovered to be cracked. It was determined that these problems were due to chemical agents in the primary coolant water. The roll pins were replaced by solid stainless steel pins. The primary coolant was replaced and the reactor is currently in operation. Surveillance specimens will be used to monitor any possible future discoloration. The high enriched fuel (HEU) is being prepared for eventual shipment to a high enriched fuel receiving facility.
Date: August 1, 1992
Creator: Rohach, A. F.
Partner: UNT Libraries Government Documents Department

Strains in a cantilever plate obtained from second derivatives of holographically measured mode shapes

Description: Reliable derivatives up to second order over a surface are obtained from holographic interferograms. This is done on a large scale, handling an amount of data that would be prohibitive if attempted by hand smoothing. This opens the way for bending and shear strain determinations in a non-contacting way over large fields of view. The surface need be treated in no special way, in contrast to the preparation required with brittle lacquers and photoelastic coatings. Strains in the microstrain range are readily measured. Holographic interferometry in conjunction with the numerical methods mentioned constitute a non-contacting optical strain gauge. Furthermore it makes possible experimental application of sophisticated modal analysis because the normal modes upon which these techniques are based are directly measured. For example, if the vibratory behavior is known, through a sufficiently large sample of the normal modes, then the static behavior may be calculated. Similarly, if the normal modes of a non-rotating body are known its behavior in a rotating system can be calculated. Thus the centrifugal stiffening of a turbine rotor may be predicted from a knowledge of the spectrum of its normal modes.
Date: January 1, 1976
Creator: Sollid, J. E. & Stetson, K. A.
Partner: UNT Libraries Government Documents Department

HTGR Safety Evaluation Division. Quarterly report, July 1--September 30, 1975

Description: Progress is summarized in the following areas: fission product release and transport; primary coolant impurities; rapid graphite oxidation; structural evaluations; materials; instrumentation and monitoring; and phenomena modeling and systems analysis. A review is presented of studies on the maximum hypothetical fission product release, and a loop experiment is proposed.
Date: January 1, 1975
Partner: UNT Libraries Government Documents Department

Perpendicular explosive drive and oblique shocks

Description: Oblique shocks in various materials driven by Composition B-3, 9404, and TNT with the detonation wave perpendicular to the interface are investigated with flash radiographic techniques. The detonation products in the rarefaction behind the detonation front expand laterally as the explosive-sample interface bends under shock compression of the sample. With the products described by a polytropic gas equation of state, this expansion is shown to be adequately described in the vicinity of the detonation front by Prandtl-Meyer flow. Some new Hugoniot data for antimony are obtained in the course of the investigation. In some instances of perpendicular drive the compression of the sample is not accomplished strictly by strong shocks. This circumstance is exemplified by baratol driving aluminum, a case where the bulk sound speed exceeds the detonation velocity, and by 9404 driving beryllium, a case where it does not. Some experimental results are presented for both these systems.
Date: January 1, 1976
Creator: Neal, T.
Partner: UNT Libraries Government Documents Department

Characteristics, stability, and short-wavelength phenomena in two-phase flow equation systems

Description: The occurrence and significance of complex characteristics in two-phase flow equation systems are clarified by a detailed analysis of separated two-phase flow between two parallel plates. The basic system of one-dimensional, two-phase flow equations for this problem possesses complex characteristics, exhibits unbounded instabilities in the short-wavelength limit, and constitutes an improperly posed initial value problem. These difficulties have led some workers to propose major modifications to the basic equation system. The relatively minor modification of introducing surface tension is shown to be sufficient to render the characteristics real, to stabilize short-wavelength disturbances, and to produce a properly posed problem. For a given value of the surface tension, the basic equation system thus modified is shown to predict correctly the evolution of small-amplitude disturbances having wavelengths long compared to the plate spacing. A formula is given for the artificial surface tension necessary to stabilize wavelengths of the order of the mesh spacing in a finite-difference numerical calculation. A brief discussion is given concerning the expected behavior of surface tension as compared to viscosity in the nonlinear regime. The general relationship between characteristics and stability is discussed in Appendix A.
Date: February 1, 1976
Creator: Ramshaw, J. D. & Trapp, J. A.
Partner: UNT Libraries Government Documents Department

Flow-induced vibration of component cooling water heat exchangers

Description: This paper presents an evaluation of flow-induced vibration problems of component cooling water heat exchangers in one of Taipower's nuclear power stations. Specifically, it describes flow-induced vibration phenomena, tests to identify the excitation mechanisms, measurement of response characteristics, analyses to predict tube response and wear, various design alterations, and modifications of the original design. Several unique features associated with the heat exchangers are demonstrated, including energy-trapping modes, existence of tube-support-plate (TSP)-inactive modes, and fluidelastic instability of TSP-active and -inactive modes. On the basis of this evaluation, the difficulties and future research needs for the evaluation of heat exchangers are identified. 11 refs., 19 figs., 3 tabs.
Date: January 1, 1990
Creator: Yeh, Y. S.; Chen, S. S. (Taiwan Power Co., Taipei (Taiwan). Nuclear Engineering Dept. & Argonne National Lab., IL (USA))
Partner: UNT Libraries Government Documents Department

The Meta-Lax method of stress reduction in welds. [ASTM A36; AISI 4140]

Description: This study is the second phase of ongoing research into the mechanics and feasibility of using the Meta-Lax method of vibratory stress relief in place of thermal methods of stress relief. The first phase of this research revealed results that were similar to, and even superior to those achieved using thermal methods. The testing here was designed to eliminate the effects of interbead tempering by utilizing single pass bead-on-plate welds only. A metallurgical explanation for the success of the Meta-Lax method was not found. No significant structure or chemical changes were noted when used with ASTM A36 or AISI 4140 materials, and the phenomena noted in phase I was apparently due to interbead tempering. The theory of accelerated aging has been proposed and studies exist which observed dislocation motion as a result of vibratory treatment. It is evident that the vibratory stress relief system does not impart sufficient energy to bring about the magnitude of change seen with thermal methods. however the physical improvement is a reality, and vibratory methods should be evaluated further.
Date: July 31, 1992
Creator: Smith, S. M.
Partner: UNT Libraries Government Documents Department