This paper describes a numerical study of the stress distribution in pin-loaded lugs. The effects of : (i) the ratio of lug width ( w) to hole diameter ( d), (ii) the ratio of the distance of the hole centre from the free end of the lug ( h) to hole diameter ( d), and (iii) the pin interference/clearance, on the magnitude and position of the maximum circumferential stress around the hole in the lug are established and discussed. Pin fit is shown to be a particularly important detail and the beneficial effects of an interference fit are shown to be considerable. It is also shown that for ratios w/d greater than 4 and h/d greater than 3 there is little variation in the maximum circumferential stress for a given applied load.
This paper contains a numerical analysis of a cracked pin-loaded tube. The relationship between the various methods of calculating`total' or`equivalent' stress intensity factors is discussed and the reliability of using J contour integral results is shown. Trends in the stress intensity factors K I , K II , K III and K e are found and the changes in these factors for changes in the profile and length of the crack are explained. A set of`best-case' curves reflecting the profile of the crack in the experimental work and the method of selecting these cases is shown; these will be used for comparison with experimental data in a companion paper, Part 2, which follows.
This paper describes a numerical study of the stress distribution in pin-loaded tubes. The effects of (a) the distance from the pin to the open end, (b) the variation in pin diameter, (c) the variation of tube thickness and (d) the variation in pin fit on the radial and circumferential stresses around the pin hole have been found and discussed. It is found that there are considerable differences between the stresses at the inner and outer surfaces of the tube which arise because the region around the pin and towards the open end of the tube ovalizes. This ovalization is more pronounced for a small head distance, a smaller diameter pin, a thinner tube and a clearance fit. The results for the pin-loaded tube are compared with those for a pin-loaded lug and it is shown that there are many similarities in the stress patterns.
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