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A method of direct determination of the instantaneous stress-intensity factor associated with running and arrested cracks in steels has been developed at the University of Maryland. Birefringent coatings have been applied to the proposed ASTM standard crack arrest compact specimens of oil-quenched and tempered 4340 steel. Isochromatic fringe patterns during crack propagation and crack arrest have been photographed successfully with an ultrahigh-speed Cordin camera and specially designed high-intensity and short-duration Xenon lamp system.
In this paper a detailed description of the experimental apparatus, the method of isochromatic fringe analysis technique, and an examination of behavior of the stress-intensity factor during crack propagation and after arrest are presented.
dynamic photoelasticity, birefringent coating, crack propagation, crack arrest, stress intensity factor and crack velocity
Associate professor, University of Maryland, College Park, Md.
Dean College of Engineering, University of Rhode Island, Kingston, R.I.