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Design and development of an automatic residual stress measuring device


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Hutchinson, Ian Nigel 1989 , 'Design and development of an automatic residual stress measuring device', Research Master thesis, University of Tasmania.

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This thesis describes the design and development of
prototype automatic devices for the measurement of residual
stress in magnetic materials. The device, called an "Automatic
Rotation Rig", or ARR for short, uses the principal of magnetic
anisotropy to determine the difference in the principal stresses
and their direction at the surface of the material. The stress
measurement is averaged over an area of approximately 5 mm by 5
mm, to a depth of about 1 mm.
Three such devices have been built in the period from
January 1987 to February 1989. These have been designed for the
measurement of residual stress in railway wheels and tracks.
Railway wheels may fail if the rim becomes sufficiently tensile,
hence the device may be used to detect unsafe wheels and allow
for their removal from service. Continuous railway tracks are
welded together to induce tension along their length. This
tension counteracts compression due to heating of the rail. Thus
the ARR may be able to be used to determine the "stress free"
temperature of the rail. This can be used to find whether or not
the welding has induced sufficient tension into the rail, or at
what ambient temperature the rail may buckle due to excessive
longitudinal compression.
The residual stress measuring device can also be used for
other applications where the difference imprincipIe stresses
needs to be measured on reasonably flat ferrous materials. The
device is portable and reasonably cheap and easy to produce.
Prototype ARR's have proven to be reliable in field trials, thus
leading to the possibility of their being manufactured

Item Type: Thesis - Research Master
Authors/Creators:Hutchinson, Ian Nigel
Keywords: Residual stresses
Copyright Holders: The Author
Copyright Information:

Copyright 1989 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Eng.Sc.)--University of Tasmania, 1990. Bibliography: p. 125-126

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