SYMPOSIA PAPER Published: 01 January 1982
STP30100S

Fatigue Crack Growth in Cruciform-Welded Joints under Nonstationary Narrow-Band Random Loading

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Fatigue tests were carried out in air at zero mean load on unstress-relieved cruciform-welded steel joints. The load history used consisted of four different levels of stationary narrow-band random loading arranged in rising and falling sequence, with an overall block length of 100 000 cycles. The fracture surfaces had program markings corresponding to the load blocks. Analysis of these showed that for medium crack depths residual stresses and the level of the maximum load have little effect on fatigue crack growth rate, which can be predicted fairly accurately from constant-amplitude data using linear summation. Crack growth rates for shallow (<1.5 mm) cracks are strongly influenced by tensile residual stresses, and events within this region dominate the overall life. Analysis of two specimens tested in seawater with cathodic protection showed that crack growth was significantly slower than in air.

Author Information

Pook, LP
National Engineering Laboratory, East Kilbride, Glasgow, Scotland
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Details
Developed by Committee: E08
Pages: 97–114
DOI: 10.1520/STP30100S
ISBN-EB: 978-0-8031-4841-3
ISBN-13: 978-0-8031-0711-3