A Low-Cost Microprocessor-Based Data Acquisition and Control System for Fatigue Crack Growth Testing

2008 ◽  
pp. 101-101-17 ◽  
Author(s):  
PM Sooley ◽  
DW Hoeppner
Keyword(s):  
Fatigue Crack ◽  
Control System ◽  
Fatigue Crack Growth ◽  
Data Acquisition ◽  
Crack Growth ◽  
Low Cost ◽  
And Control ◽  
Fatigue Crack Growth Testing

scholarly journals Fatigue crack growth testing using varying R-ratios

2010 ◽  
Vol 2 (1) ◽  
pp. 155-161 ◽  
Author(s):  
Magnus Hörnqvist ◽  
Thomas Hansson ◽  
Olle Clevfors
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Testing

Effects of Hydrogen on Fatigue Crack Growth of Iron Aluminides

1994 ◽  
Vol 364 ◽  
Author(s):  
A. Castagna ◽  
N.S Stoloff
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Al Alloys ◽  
Moist Air ◽  
Stress Intensity Range ◽  
Low Levels ◽  
Structural Iron ◽  
Fatigue Crack Growth Testing ◽  
Crack Growth Rates

AbstractThree Fe-Al alloys, FAP-Y, FA-129, and Fe-35a%Al, containing 16, 28, and 35a%Al, respectively, have been subjected to fatigue crack growth testing in moist air, in oxygen, and in gaseous hydrogen. In each case hydrogen and air were embrittling. Crack growth rates increased significantly as frequency decreased. Fatigue crack growth results have been compared with those for other structural iron-base alloys. Surprisingly, FAP-Y displays the highest crack growth rate of any alloy examined, except at very low levels of stress intensity range. The mechanisms for embrittlement by hydrogen and by moisture in air are discussed.

Full Size Fatigue Crack-Growth Testing for Girth Welds

2004 ◽  
Author(s):  
Paulo Gioielli ◽  
Jaime Buitrago
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Production Quality ◽  
Small Scale ◽  
Loading Frequency ◽  
Growth Data ◽  
Girth Welds ◽  
Crack Growth Modeling ◽  
Fatigue Crack Growth Testing

Fatigue crack-growth modeling has a significant impact in establishing defect acceptance criteria for the inspection of fracture-critical, girth-welded components, such as risers and tendons. ExxonMobil has developed an experimental technique to generate crack-growth data, in actual welded tubulars, that account for the particular material properties, geometry, and residual stresses. The technique is fully compatible with conventional fracture mechanics models. It uses a series of pre-designed notches made around the welds on a production quality, full-scale specimen that is tested efficiently in a resonant fatigue setup. The crack development from notches is monitored during testing and evaluated post-mortem. Given its simplicity and high loading frequency, the technique provides growth data germane to the component at hand at a lower cost and faster than standard, small-scale tests.

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