Automated crack testing in valve seat ring production : Industrial and production engineering, vol. 11, no. 1, pp. 48–51 (1987)

Abstract

A combined Tardy and photoelastic fringe multiplication methodology is reviewed for three-dimensional stress freezing photoelasticity. Specifically, the investigation concerns the thin transitional region near the free surface-crack front intersection in a finite body. The photoelastic data are combined with moiré interferometry to provide stress and displacement fields surrounding a crack tip. Experimental methodology involving refined thin slicing techniques, enhanced photoelastic fringe constant determination and photoelastic data interpretation is presented.