Abstract
Introductory the basic theoretical principles for the assessment of the stress-strain relationship are alluded to, with special respect to the plane state of stress. Then it is shown, in what way permanent residual stresses originate in glass and how they can be detected qualitatively. After that the usual measuring methods for the quantitative determination of stresses are discussed. Beginning with purely manual photo-elastic methods, which use so-called compensators for the determination of the magnitude of stresses, the development of automatical measuring systems, provided that the directions of the principal stresses are known, is described. Finally, a new fully automatic measuring system for stresses is presented. This system is able to determine the maximum stresses, including their sign, without any precondition. In the second part the special properties of residual stresses in the case of drawn and floated glass are discussed. Based on pattern of isoclinics, which have been experimentally determined fundamental statements concerning the state of plane residual stress of flat glass are made. Finally, some typical results of measurement are presented and discussed.
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