Advanced Method of Meauring Surface Stress Using Digital Image Analysis Based Readout

Residual stresses on the surface of tempered glass are not very uniform. Two types of non-uniformity are typically present:

(a) related to uneven nozzle spacing and uneven airflow.
(b) relative motion of nozzles.
(c) cooling near the deges and relative position of edge-to-nozzles.
(d) leading and trailing edge differences.

Also, a combination of edge-to-edge and surface-to-surface distribution decreases the surface compression near the edge, introducing additional non-uniformity.

- As result of these stress non-uniformities, an irregular break pattern should be expected.
- Experimental study of surface stress near edges is possible, using GASP. This paper shows that Digital Image Analysis makes these measurements easy and permits an accurate study of the surface stress distribution near straight and curved edges.

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