Closure to “Discussion of ‘Effects of Stress Ratio on Fatigue Crack Growth Rates in X70 Pipeline Steel in Air and Saltwater’ by Oldrich Vosikovsky” by Oldrich Vosikovsky

1981 ◽  
Vol 9 (2) ◽  
pp. 159
Author(s):  
KC Lieb ◽  
R Horstman ◽  
KA Peters ◽  
RL Meltzer ◽  
M Bruce Vieth ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Rates ◽  
Stress Ratio ◽  
Pipeline Steel ◽  
X70 Pipeline Steel ◽  
Effects Of Stress ◽  
Crack Growth Rates

Fatigue crack growth rates of API X70 pipeline steel in a pressurized hydrogen gas environment

2013 ◽  
Vol 37 (5) ◽  
pp. 517-525 ◽  
Author(s):  
E. S. Drexler ◽  
A. J. Slifka ◽  
R. L. Amaro ◽  
N. Barbosa ◽  
D. S. Lauria ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Rates ◽  
Pipeline Steel ◽  
Hydrogen Gas ◽  
X70 Pipeline Steel ◽  
Gas Environment ◽  
Crack Growth Rates

scholarly journals Hydrogen Effects on Fatigue Crack Growth Rates in Pipeline Steel Welds

2016 ◽  
Author(s):  
Joe A. Ronevich ◽  
Brian P. Somerday
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Rates ◽  
Pipeline Steel ◽  
Hydrogen Gas ◽  
Friction Stir Weld ◽  
Friction Stir ◽  
Welding Processes ◽  
Crack Growth Rates

Fatigue crack growth rate (da/dN) versus stress intensity factor range (ΔK) relationships were measured for various grades of pipeline steel along with their respective welds in high pressure hydrogen. Tests were conducted in both 21 MPa hydrogen gas and a reference environment (e.g. air) at room temperature. Girth welds fabricated by arc welding and friction stir welding processes were examined in X65 and X52 pipeline grades, respectively. Results showed accelerated fatigue crack growth rates for all tests in hydrogen as compared to tests in air. Modestly higher hydrogen-assisted crack growth rates were observed in the welds as compared to their respective base metals. The arc weld and friction stir weld exhibited similar fatigue crack growth behavior suggesting similar sensitivity to hydrogen. A detailed study of microstructure and fractography was performed to identify relationships between microstructure constituents and hydrogen accelerated fatigue crack growth.

scholarly journals Fatigue crack growth rates of 10CrNi3MoV steel welded joints considering the stress ratio

2021 ◽  
Vol 33 ◽  
pp. 802-808
Author(s):  
Wei Song ◽  
Jingjing Li ◽  
Xuesong Liu ◽  
Ping Wang ◽  
Di Wan ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Rates ◽  
Welded Joints ◽  
Stress Ratio ◽  
Crack Growth Rates

Fatigue Crack Growth of Stainless Steel Piping in a Pressurized Water Reactor Environment

1979 ◽  
Vol 101 (1) ◽  
pp. 73-79 ◽  
Author(s):  
W. H. Bamford
Keyword(s):  
Stress Intensity Factor ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Intensity Factor ◽  
Crack Growth ◽  
Growth Rates ◽  
Stress Ratio ◽  
Pressurized Water ◽  
Crack Growth Rates

Fatigue crack-growth behavior was investigated for types 304 and 316 stainless steel exposed to a pressurized water reactor environment. The effects of test frequency, stress ratio, specimen orientation, heat to heat variables and weld versus base metal performance were evaluated. Crack-growth rates were correlated with the range of crack-tip stress intensity factor, as well as the “effective stress intensity factor” proposed by Walker to account for R ratio effects. Results of the study showed that fatigue crack-growth rates in the water environment were not significantly different from results at the same stress ratio in an air environment at the same temperature. The most important parameter found to affect the crack-growth rate was the stress ratio R, and increasing values of R produced increased crack-growth rates at any given value of stress intensity factor range ΔK. The stress ratio effects were successfully accounted for by employment of the Walker model.

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