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Computing the effect of plastic deformation of piping on pressure transient propagation. [LMFBR]

Description: The computer program PTA-1 performs pressure-transient analysis of large piping networks using the one-dimensional method of characteristics applied to a fluid-hammer formulation. The effect of elastic-plastic deformation of piping on pulse propagation is included in the computation. Each pipe is modeled as a series of rings, neglecting axial effects, bending moments, and inertia. The fluid wave speed is a function of pipe deformation and, consequently, of position and time. Comparison with exi… more
Date: January 1, 1977
Creator: Youngdahl, C.K. & Kot, C.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Hydraulic pressure pulses with elastic and plastic structural flexibility: test and analysis (LWBR Development Program)

Description: Pressure pulse tests were conducted with a flexible test section in a test vessel filled with room temperature water. The pressure pulses were generated with a drop hammer and piston pulse generator and were of a sufficient magnitude to cause plastic deformation of the test section. Because of the strong pressure relief effect of the deforming test section, pressure pulse magnitudes were below 265 psig in magnitude and had durations of 50 to 55 msecs. Calculations performed with the FLASH-35 bi… more
Date: March 1978
Creator: Schwirian, R. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Correlation of mechanical and metallurgical parameters with the acoustic emission during tensile deformation of several metals and alloys

Description: Acoustic emission was monitored during plastic deformation under dead-weight tensile loading of polycrystalline aluminum, brass, copper, and steel. The acoustic emission data, both threshold-type and frequency-analysis type, were correlated with yield strength, stored elastic energy, strain hardening parameters, loading histories, diffusion processes, slip band motion and mosaic cell size. Major results are presented under the headings discontinuous yielding (Portevin--Le Chatelier Effect), par… more
Date: December 1, 1975
Creator: Hartman, W. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Eulerian method for large-displacement fluid-structure interaction in reactor containments

Description: An Eulerian method for analyzing large-displacement fluid-structure interaction in reactor containments is presented. The emphasis is on the development of a generalized hydrodynamic scheme to treat the irregular cells created by the movement of the structure with respect to the fixed Eulerian coordinates. A relaxation equation is derived from the boundary condition at the fluid-structure interface for the solution of the pressure at the interface. By combining this with the Poisson equation a … more
Date: January 1, 1977
Creator: Chang, Y. W. & Wang, C. Y.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Computer simulation of LMFBR piping systems. [Accident conditions]

Description: Integrity of piping systems is one of the main concerns of the safety issues of Liquid Metal Fast Breeder Reactors (LMFBR). Hypothetical core disruptive accidents (HCDA) and water-sodium interaction are two examples of sources of high pressure pulses that endanger the integrity of the heat transport piping systems of LMFBRs. Although plastic wall deformation attenuates pressure peaks so that only pressures slightly higher than the pipe yield pressure propagate along the system, the interaction … more
Date: January 1, 1977
Creator: A-Moneim, M.T.; Chang, Y.W. & Fistedis, S.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pressure transient analysis in piping systems including the effects of plastic deformation and cavitation. [PTA-2 code]

Description: Computational methods for analyzing pressure transients in the intermediate heat transport system of a sodium-cooled breeder reactor are being developed at Argonne National Laboratory. Because these systems typically operate at low pressures, thin-walled piping is used. Consequently, the pressure pulses produced by a sodium/water reaction in a steam generator or a pipe break may plastically deform sections of the piping, and rarefaction waves, because of the low operating pressure, may produce … more
Date: March 1, 1978
Creator: Youngdahl, C.K.; Kot, C.A. & Valentin, R.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modeling subsidence due to geothermal fluid production

Description: Currently, liquid dominated geothermal systems hold the maximum promise for exploiting geothermal energy in the United States. The principal characteristic of such systems is that most of the heat is transferred by flowing water, which also controls subsurface fluid pressures and stress changes. The reduction in pore pressures brought about by geothermal fluid extraction is potentially capable of causing appreciable deformation of the reservoir rocks leading to displacements at the land surface… more
Date: October 1, 1977
Creator: Lippmann, M.J.; Narasimhan, T.N. & Witherspoon, P.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Load relaxation studies of zircaloy-4

Description: The results of the present work have shown (1) the load relaxation data of Zircaloy-4 in the temperature range of 200/sup 0/C to 385/sup 0/C can be represented by the phenomenological model based on Hart's plastic equation of state; (2) the room temperature load relaxation data reflect the effects of deformation twinning; (3) at higher temperatures the load relaxation data suggest the contribution of grain boundary sliding; and (4) the effects of strain aging can be identified based on the load… more
Date: January 1, 1976
Creator: Huang, F. H.; Sabol, G. P.; McDonald, S. G. & Li, C. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cladding creepdown under compression. [BWR; PWR]

Description: Light-water power reactors use Zircaloy tubing as cladding to contain the UO/sub 2/ fuel pellets. In-service operating conditions impose an external hydrostatic force on the cladding, causing it to creep down into eventual contact with the fuel. Knowledge of the rate of such creepdown is of great importance to modelers of fuel element performance. An experimental system was devised for studying creepdown that meets several severe requirements by providing (1) correct stress state, (2) multiple … more
Date: November 9, 1977
Creator: Hobson, D.O.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Acoustic emission from beryllium

Description: The acoustic emission from both powder and ingot source beryllium has been measured as a function of strain and prior heat treatment. Most measurements were made during tensile deformation, but a limited number of compression tests have also been performed. The acoustic emission observed was of the burst type, with little or no contribution from continuous type emission. The emission was characterized by the variation of burst rate and average energy per burst as a function of strain. The tensi… more
Date: June 9, 1976
Creator: Heiple, C. R. & Adams, R. O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Structural analysis of TFTR vacuum vessel bellows and bellows cover sections

Description: A structural evaluation of the bellows and bellows cover sections was undertaken in order to confirm the structural integrity of these TFTR vacuum vessel components in the prescribed operating environment. The evaluations investigate component stability, stress, and deflection behavior. The products of this investigation appearing in this report include; (1) Structural verification of the vacuum bellows as currently defined in an operating environment of one atmosphere external pressure and 93/… more
Date: October 1, 1975
Creator: Driesen, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Analysis of the ballooning deformation of an internally pressurized thin-wall tube during fast thermal transients

Description: A large-strain time-dependent thermoplastic analysis has been developed for the ballooning deformation of a thin-wall tube subjected to internal pressure, axial loading, and fast thermal transients. This deformation initiates with the onset of plastic instability in the material, the onset being determined by a plastic-instability criterion for strain-rate sensitive materials. The interaction among the local ballooning geometry, the state of stress, and the plastic flow process was considered, … more
Date: January 1, 1977
Creator: Lin, E.I.H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

High-velocity impact tests involving thin spherical shells of tantalum and 304 stainless steel

Description: This experimental program generated data to improve computer-code modeling of impact phenomena. The improved computation technique will be used to design a fissile-material container able to withstand a 335 m/s impact. The program involved flyer-plate-impact tests using thin shells of annealed 304 stainless steel and annealed tantalum at impact velocities of 28 to 180 m/s. No active instrumentation was used in this study; instead, all data were derived from measurements of test specimens. Pre- … more
Date: August 26, 1977
Creator: Steffan, K. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Load relaxation studies of a metallic glass

Description: Experimental results of load relaxation studies of a commercial metallic glass as a function of temperature are reported. The data suggest that metallic glasses exhibit deformation behavior with flow laws similar to those governing plastic deformation in crystalline solids. The lack of appreciable work hardening in annealed material and the identification of an anelastic component are also indicated by the experimental observations. (GHT)
Date: January 1, 1977
Creator: Hadnagy, T. D.; Krenisky, D. J.; Ast, D. G. & Li, C. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Steam generator tube denting simulation testing. [PWR]

Description: Tube denting has been reported in steam generators in a number of commercial nuclear power plants in recent years. In order to aid in understanding of the mechanism leading to tube denting in the steam generators, a Bettis laboratory test program was initiated to attempt to reproduce tube denting and to investigate the effects of chemistry, design, and temperature. The results of the tests indicate that denting can be reproduced in the small model steam generator test apparatus devised for this… more
Date: February 1978
Creator: Battaglia, P. J. & Singley, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Dislocation morphology in deformed and irradiated niobium. [Neutron irradiation]

Description: Niobium foils of moderate purity were examined for the morphology of dislocations or defect clusters in the deformed or neutron-irradiated state by transmission electron microscopy. New evidence has been found for the dissociation of screw dislocations into partials on the (211) slip plane according to the Crussard mechanism: (a/2) (111) ..-->.. (a/3) (111) + (a/6) (111).
Date: June 1, 1977
Creator: Chang, C. P.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Liquid-metal fast-breeder-reactor program: reference fuel studies. Eighth quarterly report, August-October 1976. [LMFBR]

Description: In FY-76, Task 3 of Contract E(04-3)-893 consisted of the following programs: fuel rod chemistry and thermodynamics; fuel rod engineering; fuel irradiations testing and analysis; and reference structural materials. Starting in FY-77, the Fuel Rod Engineering Program was reorganized into other existing G.E. programs under the E(04-3)-893 contract. Continuation of the reports on technical progress of this program can be found under 189 No. SG009, Task 3, or 189 No. SG023, Task 11.
Date: November 1, 1976
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cladding failure by local plastic instability

Description: Cladding failure is one of the major considerations in analysis of fuel-pin behavior during hypothetical accident transients since time, location, and nature of failure govern the early postfailure material motion and reactivity feedback. Out-of-pile thermal transient tests of both irradiated and unirradiated fast-reactor cladding show that local plastic instability, or bulging, often precedes rupture and that the extent of local instability limits the initial rip length. To investigate the det… more
Date: December 1, 1977
Creator: Kramer, J. M. & Deitrich, L. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical design of ORPUS-3

Description: ORPUS-3 is the third in a series of pulsed superconducting solenoids built to test construction techniques applicable to tokamak poloidal field coils. The present coil is designed to be charged to a maximum field of 7 T in 1 sec. Stored energy is approximately 300 kJ. The conductor is a high copper-superconductor ratio mixed matrix material developed for this application. In this paper we present a mechanical design which uses distributed reinforcement to support a self-ventilating braid conduc… more
Date: January 1, 1977
Creator: Schwall, R.E.; Gray, W.H. & Long, C.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Deformation of superplastic alloys at relatively low strain rates

Description: The superplastic and sub-superplastic creep properties of Pb-Sn eutectic and Al-Zn eutectoid alloys were studied. Various thermomechanical treatments we tested to check the possibilities of whether the subsuperplastic deformation mechanism is affected by these treatments. All thermomechanical histories were found to reveal the same stress exponent, which is believed to be indicative of the predominant mechanism. The mechanical data in the low stress region lead us to suggest that dislocation gl… more
Date: February 1, 1978
Creator: Grivas, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the fatigue resistance of CDA 182 copper for use in the impurity study experiment fusion research tokamak (ISX). [CDA 182 copper]

Description: The fatigue behavior of CDA 182, a Cu-1% Cr alloy, was evaluated under load-controlled cycling, simulating service conditions in ISX, a fusion research Tokamak. Heat-treated, work-hardened CDA 182 was selected for use in ISX on the basis of relatively good mechanical strength and high electrical conductivity. In fully reversed and zero-to-maximum-tension uniaxial fatigue tests at room temperature, engineering stress amplitude versus number of cycles to failure and cyclic strain behavior were de… more
Date: January 1, 1978
Creator: Corwin, W. R.; Hussung, R. O.; Lousteau, D. C. & Poore, M. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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