This paper describes the application of a laboratory based experimental method  to three dimensional cracked body problems in pressure vessels in order to determine the crack shape and stress intensity factor (SIF) distribution along the crack front when the crack shape is not known a-priori. Results for specific problems are presented and conditions and limitation of the method are described.
Stress Intensity Factor Distributions and Crack Growth in Pressure Vessel Problems by the Frozen Stress Method
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Smith, CW, & Liu, CT. "Stress Intensity Factor Distributions and Crack Growth in Pressure Vessel Problems by the Frozen Stress Method." Proceedings of the ASME 2004 International Mechanical Engineering Congress and Exposition. Pressure Vessels and Piping. Anaheim, California, USA. November 13–19, 2004. pp. 103-110. ASME. https://doi.org/10.1115/IMECE2004-60380
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