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Structural Research Series 564PDF


Title:Experimental J Estimation Formulas for Single Edge Notch Bend Specimens Containing Mismatched Welds
Author(s):Kirk, M.T.; Dodds, Robert H., Jr.
Subject(s):Fracture mechanics
Finite element analysis
Abstract:This study addresses the effect of weld strength mismatch on] estimation formulas for single edge notch bend, SE(B), specimens. A crack located on the weld joint centerline is treated. The combined effects of weld groove type, degree of mismatch, and crack depth to specimen width (a/W) ratio are considered by performing plane-strain elastic-plastic finite element analyses of SE(B) specimens containing a variety of common weld groove details. This study reveals that treating a welded bend specimen as if it is made entirely from weld metal limits I estimation errors. The maximum J estimation error observed for +/- 20% mismatch is 15% based on LLD and 10% based on CMOD. The all weld metal approximation fails to properly account for the effect of the weld on the limit load and on plasticity distribution within the SE(B) specimen. However, these two inadequacies produce errors of opposite sign. This error cancellation helps promote accurate J estimation.
Issue Date:1991-12
Publisher:University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.
Series/Report:Civil Engineering Studies SRS-564
Genre:Technical Report
Sponsor:David Taylor Research Center, Metals and Welding Division
Contract No. N61533-90-K-0059
Date Available in IDEALS:2009-11-09

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