Experimental J Estimation Formulas for Single Edge Notch Bend Specimens Containing Mismatched Welds

Kirk, M.T.; Dodds, Robert H., Jr.

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https://hdl.handle.net/2142/14182 Copy

Description

Title

Experimental J Estimation Formulas for Single Edge Notch Bend Specimens Containing Mismatched Welds

Author(s)

• Kirk, M.T.
• Dodds, Robert H., Jr.

Issue Date

1991-12

Keyword(s)

• Fracture mechanics
• Weldments
• 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.

Publisher

University of Illinois Engineering Experiment Station. College of Engineering. University of Illinois at Urbana-Champaign.

Series/Report Name or Number

Civil Engineering Studies SRS-564

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/14182

Sponsor(s)/Grant Number(s)

• David Taylor Research Center, Metals and Welding Division
• Contract No. N61533-90-K-0059

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