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New Ring Specimen Geometries for Determining the Ductile Failure Locus of Tubular Steels

[+] Author and Article Information
Mohamed Al-Khaled

Department of Mechanical Engineering Khalifa University of Science and Technology The Petroleum Institute P.O. Box 2533, Abu Dhabi, UAE
moaalkhaled@pi.ac.ae

Imad Barsoum

Department of Mechanical Engineering Khalifa University of Science and Technology The Petroleum Institute P.O. Box 2533, Abu Dhabi, UAEDepartment of Aeronautical & Vehicle Engineering Division of Lightweight Structures Royal Institute of Technology - KTH Teknikringen 8, 100 44 Stockholm, Sweden
ibarsoum@pi.ac.ae

1Corresponding author.

ASME doi:10.1115/1.4038311 History: Received August 18, 2017; Revised October 18, 2017

Abstract

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 tubular steel is studied. Two ring specimen configurations were optimized to allow the determination of the ductile failure locus of both tensile and plane strain loadings. The geometry of both ring specimen configurations was optimized to achieve a plane strain (??=0) condition and a generalized tension (??=-1) 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 variation in the Lode parameter. The ASME-BPVC local failure criterion showed close agreement with experimental results.

Copyright (c) 2017 by ASME
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