18 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Young Modulus"  
Results: 1 - 18
open access

Structural analysis of TFTR toroidal field coil conceptual design

Description: The conceptual design evaluation of the V-shaped toroidal field coils on the Tokamak Fusion Test Reactor has been performed by detailed structural analysis with the finite element method. The innovation provided by this design and verified in this work is the capability to support toroidal field loads while simultaneously performing the function of twist restraint against the device axial torques resulting from the vertical field loads. The evaluations made for the conceptual design provide pre… more
Date: October 1, 1975
Creator: Smith, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Softening of Young's modulus of polycrystalline Nb/sub 3/Sn

Description: Ultrasonic measurements show that the shear modulus (C/sub 11/-C/sub 12/)/2 softens dramatically as single crystals of Nb/sub 3/Sn approach the martensitic transition near 50K. It is expected that Young's modulus of polycrystals will olso soften, but previous ultrasonic measurements, which suffer from severe damping, fail to show the expected effect. We have measured Young's modulus of polycrystalline Nb/sub 3/Sn between 4.2K and 300K by static beam deflection methods, and observe marked soften… more
Date: June 1, 1979
Creator: Welch, D.O.; Bussiere, J.F. & Suenaga, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Strength of irradiated graphite: a review

Description: Experimental data on the mechanical strength of nuclear graphite subjected to fast neutron irradiation are reviewed. At fluences below the turnaround point, the mean tensile, flexural, or compressive strength, S, increases over the unirradiated value, S/sub 0/, in a manner related to the irradiation-induced change in Young's modulus, E: S/S/sub 0/ = (E/E/sub 0/)/sup K/. The exponent, k, takes a value between 0.5 and 1, depending on the graphite grade, the irradiation temperature, and the method… more
Date: July 1979
Creator: Price, R. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Ultimate Strength, Low Stress Creep Characteristics, and Thermal Intercept Methods for an Epoxy Fiberglass Tension Member Support

Description: A support system utilizing epoxy fiberglass tension members will be used for the UTSI Superconducting Dipole Magnet. Elements of a support system have a basic member which is a link in which a composite is wound around a mandrel. This element uses the strength of the material fibers in a most advantageous way. The flexural and torsional load imputs to the link at its end must be minimized. A spherical bearing with a cylindrical outer surface functions as the central pin. Experience gained in th… more
Date: January 1, 1979
Creator: Niemann, R. C.; Gonczy, J. D.; Hoffman, J. A.; Mataya, K. F.; Smelser, P. & Young, W. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Property changes in graphite irradiated at changing irradiation temperature. [Neutrons]

Description: Design data for irradiated graphite are usually presented as families of isothermal curves showing the change in physical property as a function of fast neutron fluence. In this report, procedures for combining isothermal curves to predict behavior under changing irradiation temperatures are compared with experimental data on irradiation-induced changes in dimensions, Young's modulus, thermal conductivity, and thermal expansivity. The suggested procedure fits the data quite well and is physical… more
Date: July 1, 1979
Creator: Price, R.J. & Haag, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Martensitic phase transformation in shape-memory alloys

Description: Isothermal studies are described of the shape-recovery phenomenon, stress-strain behavior, electrical resistivity and thermo-electric power associated with the martensite-parent phase reaction in the Ni-Ti shape-memory alloys. The energy-balance equation that links the reaction kinetics with the strain energy change during the cooling-deforming and heating cycle is analyzed. The strain range in which the Clausius-Clapeyron equation satisfactorily describes this reaction is determined. A large c… more
Date: January 1, 1979
Creator: Golestaneh, A A
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Comparison of initial damage rates using neutron and electron irradiations

Description: The purpose of this experiment was twofold: (1) The number of interstitials that pin dislocations was studied as a function of neutron energy. (2) By comparison with electron irradiations on the sample, a correlation between the predicted and measured numbers of defects was found. All irradiations were performed on the same high purity copper sample. The sample was machined in the form of a cantilever beam with a flexural resonant frequency of 770 Hz. Changes in Young's modulus at constant stra… more
Date: August 1, 1978
Creator: Goldstone, J.A.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Radiation blistering: recent developments. [/sup 4/He/sup +/]

Description: Different metals have been proposed for radiation blistering of metals. For example, for the formation of blisters on helium bombarded metal surfaces such models are based on the coalescence of gas bubbles and the build-up of excess gas pressure in the implant region, causing large enough stresses for the occurrence of plastic deformation of the surface regions; or the percolation of helium in the lattice; or the build-up of large, lateral stresses in the implant layer causing buckling. These m… more
Date: January 1, 1978
Creator: Kaminsky, M. & Das, S.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Compression wave studies in Blair dolomite

Description: Dynamic compression wave studies have been conducted on Blair dolomite in the stress range of 0-7.0 GPa. Impact techniques were used to generate stress impulse input functions, and diffuse surface laser interferometry provided the dynamic instrumentation. Experimental particle velocity profiles obtained by this method were coupled with the conservation laws of mass and momentum to determine the stress-strain and stress-modulus constitutive properties of the material. Comparison between dynamic … more
Date: February 1, 1976
Creator: Grady, D. E.; Hollenbach, R. E.; Schuler, K. W. & Callender, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Differential neutron cross section for free interstitial production in copper

Description: Free interstitials produced by monoenergetic neutrons were monitored by changes in Young's modulus of a vibrating foil specimen. These changes can be related to the number of pinners on dislocations which depends on the number of defects produced. The pinning rate is compared with displacement cross section calculations and agrees with the Norgett--Robinson--Torrens (NRT) model. Electron irradiations on the same sample yield estimates of the free interstitial production cross section to be appr… more
Date: January 1, 1979
Creator: Goldstone, J. A.; Parkin, D. M. & Simpson, H. M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mechanical Properties of Blair Dolomite

Description: Pressure-volume, uniaxial stress loading to failure, uniaxial strain, and acoustic velocity determinations were made on Blair dolomite at confining pressures ranging to 3.5 GPa (Pa = Paschals where 10/sup 5/ Pa = 1 bar or 0.1 GPa = 1 kbar). The bulk modulus K, rapidly rises from an initial 10.4 GPa (at atmospheric pressure) to 102.0 GPa at 1 GPa pressure. At higher pressures, K remains essentially constant (110 GPa). The maximum volume change on loading is 3.9% at 3.5 GPa; the unloading closely… more
Date: October 19, 1973
Creator: Heard, H. C.; Duba, A.; Abey, A. E. & Schock, R. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Review of high-temperature graphite irradiation behavior

Description: The irradiation behavior of reactor graphites at high temperatures (500/sup 0/ to 1400/sup 0/C) to high fluences (up to 4 x 10/sup 22/ n/cm/sup 2/) is reviewed. Recent data generated during the period 1965 through 1971 are emphasized. The review covers graphite manufacture, irradiation damage, dimensional and structural changes, thermal expansion, thermal conductivity, Young's modulus, strength, and irradiation-induced creep.
Date: March 1, 1972
Creator: Engle, G.B. & Eatherly, W.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanical properties of oil shale of importance to in-situ rubblization

Description: Current proposals for true in-situ processing of oil shale employ deeply buried explosive charges to produce the desired rubblization. At short times after the explosion, the dynamic behavior of the material is of interest and can be studied in shockwave experiments. At intermediate times the divergence of the flow field requires a multidimensional specification of the material behavior which appears to be best determined from triaxial test data. At late times the possible formation of tensile … more
Date: January 1, 1977
Creator: Schuler, K. W. & Schmidt, R. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mechanical properties of porous PNZT polycrystalline ceramics

Description: Niobium-doped lead zirconate-titanate (PNZT) was used to investigate the effect of porosity on the mechanical properties of a polycrystalline ceramic. Spherical pores (110 to 150 ..mu..m diameter) were introduced by using organic materials in the initial specimen fabrication. The matrix grain size (2 to 5 ..mu..m) was kept constant. Small pores (2 to 3 ..mu..m diameter) of the order of the grain size were formed by varying the sintering conditions. The effect of porosity on strength was predict… more
Date: August 1, 1977
Creator: Biswas, Dipak R. & Fulrath, Richard M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of tuff as a waste isolation medium

Description: Tuff is of interest for use as an isolation medium for high heat producing wastes because it provides highly sorptive minerals and suitable thermomechanical properties. Also, tuff is widespread in areas that offer long and deep groundwater flow paths. The occurrence and geologic/hydrologic setting of tuff are discussed. The properties of the rock are discussed and compared with other isolation media. The favorable and unfavorable aspects are presented. Also, unresolved issues are discussed alon… more
Date: December 31, 1979
Creator: Tyler, L. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen