Effects of Staged Cooling in Shrink-Fitting Compounded Cylinders

This paper studies the effect of staged cooling of compounded cylinders in avoiding cracking due to the presence of large interference stresses and low fracture toughness in the presence of cryogenic temperatures. This study is motivated by the assembly procedure of the fulcrum (a compounded trunnio...

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Bibliographic Details
Published in:Journal of strain analysis for engineering design 2006-07, Vol.41 (5), p.349-361
Main Authors: Collier, N. O, Kaw, A. K, Besterfield, G. H, Rahman, M. M
Format: Article
Language:English
Subjects:
Air chambers
Assembly
Bascule bridges
Cooling
Cooling effects
Cryogenic engineering
Cryogenic properties
Cryogenic temperature
Cylinders
Fracture mechanics
Fracture toughness
Girder bridges
Interference stresses
Liquid nitrogen
Movable bridges
Nitrogen
Shrink fitting
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Summary:This paper studies the effect of staged cooling of compounded cylinders in avoiding cracking due to the presence of large interference stresses and low fracture toughness in the presence of cryogenic temperatures. This study is motivated by the assembly procedure of the fulcrum (a compounded trunnion-hub assembly) of bascule bridges, where the fulcrum is shrunk by immersion in liquid nitrogen so that it can then be fitted into the girder of the bridge. In a few cases, the fulcrum developed cracks during the immersion in liquid nitrogen. To study the effect of staged cooling to avoid such cracking, a finite difference model was developed of a long compounded cylinder with axisymmetric response with temperature-dependent properties. The study showed that the resistance to failure was increased by as much as 50 per cent when the compounded cylinder is cooled first in a refrigerated air chamber and followed by immersion in liquid nitrogen.
ISSN:0309-3247
2041-3130
DOI:10.1243/03093247JSA126