SYMPOSIA PAPER Published: 01 January 1988
STP23288S

Fatigue Behavior of 5Ni-Cr-Mo-V Steel Weldments Containing Fabrication Discontinuities

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Fabrication discontinuities in weldments pose a serious engineering problem for structural applications involving cyclic loading. Often, the discovery of fabrication discontinuities through nondestructive inspection can pose a dilemma: if not repaired, failure can result from crack initiation and growth; however, if improperly repaired, post-repair discontinuities of even greater severity may result. Thus, rational decision-making criteria are needed to assess the mechanical severity of actual fabrication defects in weldments. This study was undertaken to explore the applicability of linear elastic fracture mechanics to characterize the fatigue behavior of high-strength steel weldments containing lack-of-penetration (LOP) and slag/lack-of-fusion (S/LOF) discontinuities. Full penetration, double-V butt welds with reinforcements removed were tested under zero-to-tension axial loading. Various filler metals and welding techniques were used. Both sound welds and welds containing discontinuities were cycled to failure. Whenever possible, cycles to crack initiation were estimated by strain gage measurements. The fracture mechanics approach was successful in correlating the fatigue lifetimes of specimens containing single LOP discontinuities of varying size. However, the fatigue behavior of specimens containing multiple S/LOF discontinuities proved to be much more complex and difficult to analyze.

Author Information

Gill, SJ
Naval Research Laboratory, Washington, DC
Hauser, JA
Naval Research Laboratory, Washington, DC
Crooker, TW
National Aeronautics and Space Administration, Washington, DC
Kruse, BJ
Construction Department, Duke Power Company, Catawba Nuclear Project, Clover, SC
Menon, R
The University of Tennessee, Knoxville, TN
Lundin, CD
The University of Tennessee, Knoxville, TN
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Details
Developed by Committee: E08
Pages: 1025–1049
DOI: 10.1520/STP23288S
ISBN-EB: 978-0-8031-5036-2
ISBN-13: 978-0-8031-0949-0