To investigate load sequencing effects in fatigue-crack growth, surface flaw or part-through crack (PTC) specimens of a high-strength pressure vessel steel were subjected to variable-amplitude cyclic loading. Blocks of different load sequences and stress-ratio (R) patterns and cyclic lengths were employed. Crack-growth rate (da/dN) data were analyzed within the framework of linear elastic fracture mechanics using the stress-intensity range parameter, ΔK. The da/dN data were found to correlate well with a seauence-independent formulation of ΔK derived using nominal mean stress, σm, for the loading blocks studied. However, it proved necessary to utilize the normalizing relationship discussed in “Analysis of Fatigue-Crack Growth in a High-Strength Steel—Part I: Stress Level and Stress Ratio Effects at Constant Amplitude”, to account for stress-ratio effects observed under the variable-amplitude block loading. Only the sequential block pattern of high-low-intermediate produced a significant crackgrowth retardation. Predictions made using the sequence-independent normalizing procedure compare favorably with those using the Willenborg model. It is concluded that useful predictions for structural life under variable-amplitude cyclic loading sequences can be made for a wide variety of high-strength pressure vessel applications using sequence-independent analysis procedures.
Skip Nav Destination
Article navigation
August 1976
Research Papers
Analysis of Fatigue-Crack Growth in a High-Strength Steel—Part II: Variable Amplitude Block Loading Effects
A. M. Sullivan,
A. M. Sullivan
Naval Research Lab., Strength of Metals Branch, Engineering Materials Div., Washington, D.C.
Search for other works by this author on:
T. W. Crooker
T. W. Crooker
Naval Research Lab., Strength of Metals Branch, Engineering Materials Div., Washington, D.C.
Search for other works by this author on:
A. M. Sullivan
Naval Research Lab., Strength of Metals Branch, Engineering Materials Div., Washington, D.C.
T. W. Crooker
Naval Research Lab., Strength of Metals Branch, Engineering Materials Div., Washington, D.C.
J. Pressure Vessel Technol. Aug 1976, 98(3): 208-212 (5 pages)
Published Online: August 1, 1976
Article history
Received:
July 30, 1975
Online:
October 25, 2010
Citation
Sullivan, A. M., and Crooker, T. W. (August 1, 1976). "Analysis of Fatigue-Crack Growth in a High-Strength Steel—Part II: Variable Amplitude Block Loading Effects." ASME. J. Pressure Vessel Technol. August 1976; 98(3): 208–212. https://doi.org/10.1115/1.3454402
Download citation file:
Get Email Alerts
Cited By
Experimental and Numerical Study on the Protection Efficiency of a Diamond-Shaped Thermal Jacket for Gun Barrels
J. Pressure Vessel Technol (June 2024)
A Finite Element Analysis-Unascertained Measure Theory-Based Hybrid Approach to Safety Assessment for Pipelines Subject to Landslide Disasters
J. Pressure Vessel Technol (June 2024)
Study on Dynamic Post-Buckling Stability of Thin-Walled Cylinders Subjected to Horizontal Vibration
J. Pressure Vessel Technol (June 2024)
Related Articles
Analysis of Fatigue-Crack Growth in a High-Strength Steel—Part I: Stress Level and Stress Ratio Effects at Constant Amplitude
J. Pressure Vessel Technol (May,1976)
Yield-Before-Break Fracture Mechanics Analysis of High-Strength Steel
Pressure Vessels
J. Pressure Vessel Technol (February,1995)
Fatigue Crack Growth Resistance of Several Neutron Irradiated Pressure Vessel Steels and Welds
J. Eng. Mater. Technol (October,1974)
Comparison of Methods for Calculating Stress Intensity Factors for the Thread of a Pressure Vessel Closure and of a Gun Breech Ring
J. Pressure Vessel Technol (August,2003)
Related Proceedings Papers
Related Chapters
Effect of Hydrogen Pressure on Fatigue Crack Growth and Hydrogen Accumulation Behavior of High Strength Steel
International Hydrogen Conference (IHC 2016): Materials Performance in Hydrogen Environments
A Fracture Mechanics Method for an Advanced Evaluation of Inclusions and the Prediction of Fatigue Life of Rolling Element Bearings
Bearing and Transmission Steels Technology
Fatigue Crack Growth, Fatigue, and Stress Corrosion Crack Growth: Section XI Evaluation
Online Companion Guide to the ASME Boiler & Pressure Vessel Codes