Pressure vessels designed in accordance with the ASME BPVC code are protected against local ductile failure. Recent work has shown that local ductile failure highly depends on the stress state characterized by both stress triaxiality () and the Lode parameter (). In this paper, the effect of stress state on the ductility of a tubular steel is studied. Two ring specimen configurations were optimized to allow the determination of the ductile failure locus at both tensile and plane strain loadings. The geometry of both ring specimen configurations was optimized to achieve a plane strain () condition and a generalized tension () condition. Notches with different radii were machined on both types to achieve a wide range of stress triaxiality. Specimens were manufactured from SA-106 carbon tubular steel and were tested to determine the ductile failure loci as a function of and . Failure locus of SA-106 steel was constructed based on the failure instants and was found to be independent of the Lode parameter. The ASME-BPVC local failure criterion showed close agreement with experimental results (EXP).
New Ring Specimen Geometries for Determining the Failure Locus of Tubulars
The Petroleum Institute,
Khalifa University of Science and Technology,
P.O. Box 2533,
Abu Dhabi, United Arab Emirates
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received August 18, 2017; final manuscript received October 18, 2017; published online December 5, 2017. Assoc. Editor: Kiminobu Hojo.
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Al-Khaled, M. A., and Barsoum, I. (December 5, 2017). "New Ring Specimen Geometries for Determining the Failure Locus of Tubulars." ASME. J. Pressure Vessel Technol. February 2018; 140(1): 011405. https://doi.org/10.1115/1.4038311
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