3D Photoelasticity And Numerical Analysis
Of A Cylinder/half-space Contact Problem
Author(s)
A. Bilek, J.C. Dupré, A. Ouibrahima & F. Bremand
Abstract
The three-dimensional analysis of contact mechanics is still not an easy task.
Frozen stress techniques in photoelasticity have been used very much to obtain
the stress fields developed in the models. Although the means to avoid the
introduction of residual stresses are well established, these techniques remain
time consuming. Owing to the recent developments in technology of image
recording and processing, new non-destructive methods have been developed to
circumvent these difficulties. In this paper, a new non-destructive method of
optical slicing of a photoelastic model was used to analyse stresses developed in
a half space by a rigid cylinder. The basic idea is to use the properties of
polarization of the scattered light. The slice is isolated in the model by two laser
sheets. A speckle pattern due to the interference of the light beams of each
section in the direction perpendicular to these plans can be observed. The
possibility of interference depends on the birefringence of the isolated slice. A
high resolution CCD camera is used to take pictures of the two illuminated
sections. The stress field can then be analyzed using software. This technique
allows us to visualise photoelastic fringes at any given position within the model.
Comparisons are made between experimental fringes and calculated fringes
obtained by a numerical analysis using \“Castem” package. The obtained results
show close agreement between numerical predictions and the experimental
results.
Keywords: scattered light, optical slicing, photoelasticity, stress freezing,
contact, non-destructive method.
Keywords
scattered light, optical slicing, photoelasticity, stress freezing,
contact, non-destructive method.
Related Book
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