This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Effect of Notch, Corrosion and Stress Ratio on the Constant and Variable Amplitude Fatigue Behavior of two Materials
Annotation ability available
Sector:
Language:
English
Abstract
The fatigue response of 7075-T73 aluminum alloy (cyclically hardening) and SAE 1045 (mod.) steel (cyclically softening) was investigated in air and corrosive environments under constant amplitude and variable amplitude fatigue loadings. Variable amplitude tests showed that crack propagation life was important in notched specimens in air as well as in corrosive environment. In corrosive environment pits were found to act as initiation sites in the steel specimens.
The effect of stress ratio, notches and environment on the fatigue life was treated through an effective stress, 
. Here, ‘m’ is a material constant that depends on the environment. This relation was also examined to predict fatigue lives under loading with variable stress ratio and applied to fatigue results.
. Here, ‘m’ is a material constant that depends on the environment. This relation was also examined to predict fatigue lives under loading with variable stress ratio and applied to fatigue results.Authors
Topic
Citation
Bhowal, P., "Effect of Notch, Corrosion and Stress Ratio on the Constant and Variable Amplitude Fatigue Behavior of two Materials," SAE Technical Paper 810125, 1981, https://doi.org/10.4271/810125.Also In
References
- Morrow J. “Cyclic Plastic Strain Energy and Fatigue of Metals.” Internal friction, Damping, and Cyclic Plasticity, ASTM STP 378 1965 45
- Dowling N.E. “Fatigue Predictions for Complicated Stress-Strain Histories.” J. of Materials, JMLSA 7 1 1972 71 “Fatigue Life and Inelastic Strain Response under Complex Histories for an Alloy Steel.” J. of Testing and Evaluation, JTEVA 1 4 1973 271
- Topper T.H. Sandor B. I. “Effects of Mean Stress and Prestrain on Fatigue Damage Summation.” Effects of Environments and Complex Load History on Fatigue Life, ASTM STP 462 1970 93
- Topper T. H. Wetzel R.M. Morrow J. “Neuber's Notch Rule Applied to Fatigue of Notched Specimens.” ASTM J. of Materials 4 1 1969 200
- Dowling N.E. Brose W. R. Wilson W. K. “Notched Member Fatigue Life Predictions by the Local Strain Approach.” Fatigue Under Complex Loading: Analyses and Experiments SAE 6 1977 55
- Walker K. “The Effect of Stress Ratio During Crack Propagation and Fatigue for 2024-T3 and 7075-T6 Aluminum.” Effects of Environments and Complex Load History on Fatigue Life, ASTM STP 462 1970 1
- Neuber H. “Theory of Stress Concentration for Shear Strain and Prismatic Bodies with Arbitrary Non Linear Stress Strain Law.” J. of Applied Mechanics 1961 544
- Blatherwick A. A. Olson B. K. “Stress Redistribution in Notched Specimens during Fatigue Cycling.” Expt. Mechanics, EXMCA 8 8 1968 356
- Langer B, F. J. of Basic Engineering 1962 389
- Hoeppner D. W. “Model for Prediction of Fatigue Lives Based upon a Pitting Corrosion Fatigue Process.” Fatigue Mechanisms, ASTM STP 675 841