The Combined Effects of Mean Stress and Aggressive Environments on Fatigue Crack Growth
Abstract
Experiments have been performed to study the combined effects of aggressive environment and mean stress on fatigue crack growth. Since mean stress changes also change the stress ratio, R(R = sigma min/sigma max), experiments were performed to measure fatigue crack growth rates for various values of constant R. The experimental results were approximated mathematically using a modified superposition model. The results show that for negative values of R, the modified superposition model yields excellent agreement with the experiments. When R was positive, the mathematical model significantly overestimated the experimental results, suggesting that the full environmental effect condition cannot be achieved in the embrittling system chosen.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1982
- Accession Number
- ADA116562
Entities
People
- J. A. Kapp
Organizations
- United States Army Armament Research, Development and Engineering Center