Measurement Of The Deformation Of Rail Track Fastening Clips By Holographic Interferometry

A. E. Ennos

doi:10.1117/12.942455

18 January 1985 Measurement Of The Deformation Of Rail Track Fastening Clips By Holographic Interferometry

A. E. Ennos

Proceedings Volume 0473, Symposium Optika '84; (1985) https://doi.org/10.1117/12.942455
Event: Symposium Optika '84, 1984, Budapest, Hungary

Abstract

One method of attaching railway rails to the sleepers (ties) is to use spring steel clips, mounted on either side of the rail, that exert a downward force on the foot of the rail. In service these will flex with the passing of a train. Holographic interferometry has been used to measure quantitatively the manner in which the spring clips deform when the rail is given a displacement in a prescribed direction. The information can be used both to provide data on the bending and torsion of the clip, and as a means of testing the validity of finite element analysis calculations. Measurements on three different designs of commercial clip were carried out on a section of sleeper holding a short length of rail. A controlled upward displacement of the rail was achieved pneumatically by means of plastic pipes interposed between rail and concrete sleeper. Double exposure holograms were recorded on large photographic plates, allowing views of the fringe patterns from widely spaced directions. The three components of displacement at points along the length of the clip were calculated from fringe information taken from nine directions, using least squares fit to obtain increased accuracy. Rotations of the surface were calculated from the fringe directions and spacings. In addition to deformation measurements of the clip under service conditions, information on local yielding of the clip under increasing stress was also obtained by means of real-time interferometry, using an instant hologram camera.

Citation Download Citation

A. E. Ennos "Measurement Of The Deformation Of Rail Track Fastening Clips By Holographic Interferometry", Proc. SPIE 0473, Symposium Optika '84, (18 January 1985); https://doi.org/10.1117/12.942455

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KEYWORDS

Holographic interferometry

Holograms

Cameras

Finite element methods

Fringe analysis

Interferometry

Photography

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