Influences of Stress Intensity Factor and Dissolved Hydrogen on the Fatigue Crack Growth Behavior of Low-Alloy Steel in Boiling Water Reactors

CORROSION ◽  
2005 ◽  
Vol 61 (3) ◽  
pp. 273-284 ◽  
Author(s):  
Y. Y. Chen ◽  
L. H. Wang ◽  
J. C. Oung ◽  
H. C. Shih
Keyword(s):  
Stress Intensity Factor ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Growth Behavior ◽  
Boiling Water Reactors ◽  
Crack Growth Behavior ◽  
Fatigue Crack Growth Behavior ◽  
Low Alloy Steel ◽  
Dissolved Hydrogen ◽  
Water Reactors

Experimental Technique for Elevated Temperature Mode I Fatigue Crack Growth Testing of Ni-Base Metal Foils

2006 ◽  
Vol 129 (4) ◽  
pp. 594-602 ◽  
Author(s):  
L. Liu ◽  
J. W. Holmes
Keyword(s):  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Fatigue Crack Growth Behavior ◽  
Constant Amplitude ◽  
Stress Intensity Range ◽  
Metallic Foils

Details are provided for an experimental approach to study the tensile fatigue crack growth behavior of very thin metallic foils. The technique utilizes a center-notched specimen and a hemispherical bearing alignment system to minimize bending strains. To illustrate the technique, the constant amplitude fatigue crack growth behavior of a Ni-base superalloy foil was studied at temperatures from 20°C to 760°C. The constant amplitude fatigue tests were performed at a frequency of 2Hz and stress ratio of 0.2. The crack growth rate versus stress intensity range data followed a Paris relation with a stress intensity range exponent m between 5 and 6; this exponent is significantly higher than what is commonly observed for thicker materials and indicates very rapid fatigue crack propagation rates can occur in thin metallic foils.

Sign in / Sign up

Export Citation Format

Share Document