Advances In The Characterization Of The Residual Stress Distribution In Thermally Toughened Glass - Using Pulsed Magneto-Photoelasticity

摘要

Magneto-Photoelasticity (MPE) is an integrated photoelastic technique used to quantify the stress distribution in three-dimensional birefringent components. The technique is particularly useful in the analysis of stress fields that integrate to zero along the light path, examples being a plate in bending and the residual stress distribution in thermally toughened glass. To date, application of the method has relied upon an assumption regarding the form of the stress distribution, typically a linear form for a plate in bending and a parabolic form for toughened glass. Recent advances in the application of the technique have allowed data to be sampled during a continuously varying magnetic field. As such, an independent set of characteristic parameters can be measured for each sampled field increment, enabling further terms to be included in the assumed profile. This is particularly useful in order to more accurately characterize the stress distribution in circumstances where a parabolic assumption is insufficient. Results have been presented to demonstrate how the technique has been applied to characterize the residual stress distribution in toughened glass samples.