| Cold Expansion Tests for Plates Containing Elongated Holes |
OCT 1999 |
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| Authors:
M. Heller; R. L. Evans; R. B. Allan; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
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 | Cold-expansion testing of D6ac plates containing an elongated (non- circular) hole, of 2:1 aspect ratio, has been undertaken using an AMRL designed interference fit plug/sleeve arrangement The aim has been to determine the practical viability of the process as an option for addressing the cracking problem at the non-circular fuel flow vent hole number 13 in the wing pivot fitting of the F-111C aircraft in ... |
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| Effect of Bonded Insert Shape and Adhesive Thickness on Critical Stresses in a Loaded Plate |
AUG 96 |
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| Authors:
R. L. Evans; M. Heller; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| This report presents the results of finite element analyses conducted to calculate the magnitude of adhesive stresses for a large plate with a bonded insert, and study the interaction of key parameters including (1) insert shape, and (2) adhesive modulus and thickness, with maximum plate stresses. Results are presented for circular, oval and elliptical insert cases. It is shown that changing the key variables can improve the efficiency of such ... |
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| Effect of Plate Thickness on the In-Plane and Through-Thickness Stresses at a Hole |
APR 96 |
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| Authors:
R. L. Evans; DEFENCE SCIENCE AND TECHNOLOGY ORGANIZATION CANBERRA (AUSTRALIA)
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| A combined experimental and numerical study has been carried out to examine the influence of thickness on the surface and through-thickness stress distributions of aluminum alloy specimens with central holes. Thermographic and strain-gauge measurements were made on several thicknesses of specimens, the central holes of which were either reamed or cold-expanded by 3.6%. The experimental results were compared with those from numerical analyses of the specimens by three-dimensional finite-element modelling. ... |
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| Stress Analysis of a Secondary-Bending Specimen |
NOV 93 |
31 pages |
| Authors:
R. L. Evans; M. Heller; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
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 | This Note describes a two-dimensional finite-element elastic analysis of a uniaxially-loaded bolted secondary-bending specimen which was conducted to provide information relevant to a recent ARL fatigue testing program. Three different approaches were employed to model the bolt/plate interface and the results are compared with thermoelastic stress measurements. Fatigue tests, Two dimensional, Finite element analysis, Stress measurements. |
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| The Influence of Secondary Bending on Fatigue Life Improvement in Bolted Joints |
AUG 93 |
39 pages |
| Authors:
R. L. Evans; AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
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| Secondary bending often occurs in structural joints, and to assess its influence on the fatigue life enhancement technique of hole cold-expansion, an experimental program has been undertaken. The results indicate that the effect of cold working is substantially reduced in specimens with secondary bending. For any marked extension in fatigue life, additional treatments, for example the combination of cold expansion and interference fit, are required. Bending fatigue, Holes(openings), Bolted joints, ... |
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| Lunar storage of liquid propellants. |
JUL 62 |
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| Authors:
W. E. Dempster; R. L. Evans; J. R. Olivier; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HUNTSVILLE AL GEORGE C MARSHALL SPACE FLIGHT CENTER
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| The thermal environment of liquid propellant storage tanks located on the lunar surface and subsurface was investigated. The surface temperature of storage tanks located on the lunar surface depends upon the rates at which solar energy, infrared,and albedo are absorbed and reradiated by the tank. A method for artifically altering the local lunar surface temperature and the surface temperature of a tank is introduced. The surface temperatuare of a tank ... |
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