Siim Hödemann "Residual stress determination in chemically strengthened and thermally tempered glass plates using scattered light method" | University of Tartu

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Siim Hödemann "Residual stress determination in chemically strengthened and thermally tempered glass plates using scattered light method"

Date: 
01.03.2019 - 16:15
Siim Hödemann will defend his PhD thesis "Residual stress determination in chemically strengthened and thermally tempered glass plates using scattered light method" on 1 March 2019.
 
Supervisors:
Prof. Jaak Kikas, Institute of Physics, University of Tartu
Dr. Eric Tkaczyk, Vanderbilt University, USA 
 
Opponent:
Prof. Vincenzo M. Sglavo, University of Trento, Italy
 
Summary:
A new optical method for evaluation of the stress profile in chemically strengthened glass based on confocal detection of scattered laser beam is presented. Confocal microscopy allows scanning within the light beam and collecting Rayleigh-scattered light from a microscopic volume. The obtained spatial intensity profile of the Rayleigh scattering indirectly describes the stress profile in the tempered glass with very high spatial resolution. 
 
Second stress measurement method, intended for stress measurement in chemically strengthened glass, was based on oblique incidence scattered light method. For that method, an algorithm that removes the influence of light ray bending from oblique incidence scattered light method was developed. We present numerical experiments to test this iterative approach which can remove the influence of light ray bending form scattered light tomography. We found that the nature and rate of convergence of the iterative process for compressive and tensile stresses were notably different. 
 
Oblique incidence scattered light non-destructive method is used to investigate the stress build-up in chemically strengthened lithium aluminosilicate glass. We utilize an oblique scattered light method to recover a more detailed stress profile around the knee. The main motivation of the work was to characterize and optimize the development of the knee-shaped breaking point in stress profile in lithium aluminosilicate glass using one-step strengthening in a mixture of KNO3+NaNO3 molten salt bath. In the industry, it is still common using a two-step process to build such a stress profile. Single-step strengthening will simplify the process as well as save the cost. 
 
A significant find was that the iterative algorithm that was first tested in simulations also removed the influence from experimentally measured stress profiles. The iterative scheme was tested for the same purpose on experimentally measured stress profiles of chemically strengthened lithium aluminosilicate. It was concluded that stress equilibrium error was reduced by using this iterative algorithm to calculate stress form experimental optical retardation data. 
 
We also examined tempered glass plates of various thermal treatments. A linear correlation was found between surface compression measured with oblique incidence scattered light method and breaking strength measured with traditional four-point bending tests. Stress inhomogeneity was also investigated. It has been shown that surface compression of thermally tempered glass panels may vary both locally (at a distance equal to the distance between the cooling jets) and globally, i.e., stresses near the edges and corners of the panels differ significantly from the stresses in the middle part of the panels. 
 
Location: 
TÜ Physicum, W. Ostwaldi 1, 50411 Tartu, auditoorium B103
Event category: