Measurement of edge residual stresses in glass by the phase-shifting method

Control and measurement of residual stress in glass is of great importance in the industrial field. Since glass is a birefringent material, the residual stress analysis is based mainly on the photoelastic method. This paper considers two methods of automated analysis of membrane residual stress in glass sheets, based on the phase-shifting concept in monochromatic light. In particular these methods are the automated versions of goniometric compensation methods of Tardy and Sénarmont. The proposed methods can effectively replace manual methods of compensation (goniometric compensation of Tardy and Sénarmont, Babinet and Babinet–Soleil compensators) provided by current standards on the analysis of residual stresses in glasses.

Research highlights
► Two methods of automated analysis of residual stress in glass sheets are proposed.
► These methods are based on phase shifting photoelasticity in monochromatic light.
► The proposed methods can effectively replace photoelastic methods of compensation.