Browsing by Author "Whatham, JF"
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- ItemExperiments in extrusion, Part 3 - the mechanics of extrusion of beryllium.(Australian Atomic Energy Commission, 1964-12) Wright, WJ; Silver, JM; Whatham, JFThe extrusion pressures determined for beryllium and mild steel over a wide range of reductions in area at temperatures between 750ºC and 1050ºC are significantly lower than those reported previously. This is attributed to better control of temperature in the work reported, the effects of container friction were assessed and the coefficient of friction between tooling and billets was estimated as 0.03 — 0.035 when using graphite lubricants. The flow of metal in extrusion through various dies was examined using gridded billets; the velocity profiles and extent of the plastic field were determined. The work was applied to a study of the shapes developed from plane interfaces in the billets during extrusion; the interface shape necessary in die original billet to produce a plane interface in the extruded section was determined and applied in the basic extrusion technique to improve the yield of product.
- ItemResults of pipe bend analysis part X: stress distributions in flanged pipe elbows from an axial force(Australian Atomic Energy Commission, 1984-06) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of flange-ended pipe elbows subjected to an axial force applied to one flange; calculations based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part I: end effect decay constants(Australian Atomic Energy Commission, 1982-11) Whatham, JFNumerical values of decay constants are given for end effects on curved and straight pipes subjected to both in-plane and out-of-plane loading. Calculations are based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part II: stress distributions from bending flanged pipe elbows(Australian Atomic Energy Commission, 1982-11) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of flange-ended pipe elbows subjected to pure in-plane bending. Calculations are based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part III: flexibility factors of flanged - pipe bends(Australian Atomic Energy Commission, 1982-11) Whatham, JFA matrix of flexibility factors is defined for pipe bends under in-plane and out-of-plane loading, and numerical values are presented for a wide range of 90 and 180o flange-ended pipe bends; the flexibility factors for the 90o bends are plotted against the pipe-bend characteristic.
- ItemResults of pipe bend analysis, Part IV: flexibility factors of pipe bends with flanged tangents(Australian Atomic Energy Commission, 1982-12) Whatham, JFAn equivalent flexibility factor is defined for pipe bends with flanged tangent pipes under pure in-plane bending, and numerical values of this factor are presented for a range of 90o and 180o bends with various tangent lengths.
- ItemResults of pipe bend analysis, Part IX: stress distributions in flanged pipe elbows from in-plane shear(Australian Atomic Energy Commission, 1984-05) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of flange-ended pipe elbows subjected to an in-plane shear force applied to one flange; calculations based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part V: flexibility and pressure deflection factors of oval pipe bends(Australian Atomic Energy Commission, 1983-01) Whatham, JFA bending flexibility factor and a pressure deflection factor are defined for pipe bends with oval cross-sections, and numerical values of these factors are presented for pipe bends with major-to-minor axis ratios from 1 (circular) to 2 over a wide range of bend radii and wall thicknesses, ignoring end effects.
- ItemResults of pipe bend analysis, Part VI: stress distributions in flanged pipe elbows from out-of-plane bending(Australian Atomic Energy Commission, 1983-12) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of flange-ended pipe elbows subjected to a pure out-of-plane bending moment applied at one flange and pure torsion at the other; calculations are based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part VII: stress distributions in flanged pipe elbows from an out-of-plane force(Australian Atomic Energy Commission, 1983-12) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of flange-ended pipe elbows subjected to an out-of-plane force applied to one flange; calculations are based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part VIII: stresses in elbows with long tangents under in-plane bending(Australian Atomic Energy Commission, 1984-05) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for wide range of 90O pipe bends with long tangent pipes subjected to in-plane bending; calculations based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part XI: stress distributions in flanged pipe elbows from in-plane bending(Australian Atomic Energy Commission, 1984-07) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of flange-ended pipe elbows subjected to in-plane bending; calculations based on linear thin shell theory.
- ItemResults of pipe bend analysis, Part XII: stresses in elbows with long tangents under out-of-plane bending(Australian Atomic Energy Commission, 1985-05) Whatham, JFGraphs of outside surface stress distributions are presented and numerical values of stresses on inside and outside surfaces tabulated for a wide range of 90 deg pipe bends with long tangent pipes subjected to out-of-plane bending. The calculations are based on linear thin shell theory. A computer program BENDPAC was designed to calculate the stresses in and the flexibility of pipe bends with tangents under in-plane or out-of-plane bending or flanged pipe bends under any loading.
- ItemTemperature and porosity dependence of the modulus of rigidity and Poisson's ratio of beryllia(Australian Atomic Energy Commission, 1967-08) Kelly, JW; Whatham, JFUsing torsional equipment designed for the task, the modulus of rigidity of isostatically pressed and sintered beryllia was determined as a function of temperature and porosity. The temperature dependance was given by: Gt = G20 (1-at), where Gt is the modulus at toC, G20 is the modulus at 20oC and a is a constant approx. 3 x 10-5 degC independent of porosity up to 800oC. Porosity dependance was given by: Gt = Go (1-bP), where Go is the modulus at zero porosity, P is the fractional volume porosity and b is a constant approx. 1.58 independent of temperature up to 800oC. Poisson's ratio was found to be 0.30 + 0.05 and was independent of both temperature and porosity.
- ItemThermal shock testing of ceramic balls representing pebble bed reactor fuel elements(Australian Atomic Energy Commission, 1973-08) Whatham, JFA number of sintered ceramic beryllium oxide balls were heated and then quenched in fast-flowing carbon dioxide gas to determine the thermal stress which would crack similar balls containing a small amount of uranium dioxide fuel in the core of a prospective pebble bed nuclear reactor. The stress to crack the average ball was determined using simplifying assumptions, and as the balls were quenched in groups this stress will be used to calculate the allowable heat output of fuel balls in a pebble bed reactor.