In-Reactor Studies of Low-Cycle Fatigue Properties of a Nuclear Pressure Vessel Steel

2009 ◽  
pp. 350-350-14 ◽  
Author(s):  
J. R. Hawthorne ◽  
L. E. Steele
Keyword(s):  
Pressure Vessel ◽  
Low Cycle Fatigue ◽  
Fatigue Properties ◽  
Pressure Vessel Steel ◽  
Cycle Fatigue ◽  
Vessel Steel

Effect of Creep in Low-Cycle Fatigue of Pressure Vessel Steel

1970 ◽  
Vol 92 (1) ◽  
pp. 67-73 ◽  
Author(s):  
J. Dubuc ◽  
A. Biron
Keyword(s):  
Pressure Vessel ◽  
Low Cycle Fatigue ◽  
Strain Range ◽  
Fatigue Tests ◽  
Pressure Vessel Steel ◽  
Cycle Fatigue ◽  
Total Strain Range ◽  
Vessel Steel ◽  
The Mean ◽  
Mean Strain

Low-cycle fatigue tests have been carried out at 2 cpm on a pressure vessel steel at 350 deg C (662 deg F). The total strain range was fixed for each test and the minimum (or mean) strain in some cases was constant (zero minimum value), in others increased uniformly in time at a predetermined rate. It was found that variations in the mean strain up to 0.5 percent/hour had no significant influence on the results.

Equibiaxial Low-Cycle Fatigue Properties of Typical Pressure-Vessel Steels

1966 ◽  
Vol 88 (4) ◽  
pp. 745-754 ◽  
Author(s):  
K. D. Ives ◽  
L. F. Kooistra ◽  
J. T. Tucker
Keyword(s):  
Circular Plate ◽  
Pressure Vessel ◽  
Fatigue Testing ◽  
Low Cycle Fatigue ◽  
Strain Ratio ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Type Specimens ◽  
System A ◽  
Biaxial Fatigue

Large-size circular-plate specimens made of typical pressure-vessel materials were tested to determine their low-cycle fatigue strength. The test consisted of two distinct phases; i.e., development of an appropriate testing apparatus and the fatigue testing of the plate specimens. A unique apparatus was developed to test simply supported, circular plate-type specimens. Through a hydraulic system, a uniform pressure was applied to the specimen that resulted in a state of equibiaxial strain at the center of the plate. Tests were conducted to evaluate the pressure-deflection characteristics for various specimen strain levels. Biaxial fatigue data with a strain ratio (circumferential to radial) of 1:1 were generated for three pressure-vessel materials (A-201, A-302, T-1) for a completely reversed strain cycle. Initial cracking was used as a criterion of failure. Cracks were determined by monitoring electrical-resistance strain gages mounted on the specimen.

Mechanisms and Modeling Comparing HB7 and A723 High Strength Pressure Vessel Steels

2004 ◽  
Vol 126 (4) ◽  
pp. 473-477 ◽  
Author(s):  
E. Troiano ◽  
A. P. Parker ◽  
J. H. Underwood
Keyword(s):  
Residual Stresses ◽  
Pressure Vessel ◽  
High Strength ◽  
Strength Level ◽  
Fatigue Properties ◽  
Pressure Vessel Steel ◽  
Cracking Resistance ◽  
Vessel Steel ◽  
Design Engineers ◽  
Vessel Material

HB7, an ultra-clean, high strength pressure vessel steel manufactured in France, is compared to A723 steel. This steel, suggested as an improved pressure vessel material is currently being proposed for critical applications, and will likely be used more frequently as design engineers discover its capabilities. This paper includes comparisons of strength, fracture toughness, fatigue properties and composition of the two steels, followed by an in-depth comparison and modeling of environmental cracking resistance, Bauschinger-modified residual stresses and fatigue lives. Results indicate that in all critical areas, with the exception of Bauschinger-reduced residual stress, the HB7 is superior to the A723 steel. Particularly for small amounts of autofrettage, near-bore residual stresses are reduced for HB7 steel compared to those for A723 steel at the same strength level. The greatest improvement of the HB7 over the A723 is in environmental cracking resistance. The HB7, when tested in concentrated sulfuric acid, exhibits five orders of magnitude longer crack incubation times and three orders of magnitude slower crack growth rates, when compared to A723 steel at the same strength level.

Biaxial Fatigue of A533B Pressure Vessel Steel

1997 ◽  
Vol 119 (3) ◽  
pp. 325-331 ◽  
Author(s):  
D. V. Nelson ◽  
A. Rostami
Keyword(s):  
Pressure Vessel ◽  
Fatigue Behavior ◽  
Equivalent Strain ◽  
Plastic Work ◽  
Pressure Vessel Steel ◽  
Cycle Fatigue ◽  
Cracking Behavior ◽  
Vessel Steel ◽  
Biaxial Fatigue ◽  
Phase Data

The low-to-intermediate cycle fatigue behavior of A533B steel is investigated using solid round bar specimens tested in combined bending and torsion. Loadings are applied in-phase and 90 deg out-of-phase to produce cases of proportional and nonproportional biaxial fatigue. Out-of-phase loadings are found to be more damaging than in-phase loadings. Two equivalent strain criteria similar to those in the ASME Boiler and Pressure Vessel Code and a newer approach based on cyclic plastic work are used to correlate fatigue lives. The equivalent strain criteria are found to underestimate the fatigue damage in out-of-phase tests, but to provide reasonably good correlations overall. The plastic work approach provides a conservative treatment of the out-of-phase data and somewhat better overall correlation. Cracking behavior observed during the tests is also summarized.

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