Loading Frequency and its Effects on the Fatigue Life of A723 Steel
Abstract
The fatigue life of pressure vessels manufactured from two strength levels (166 Ksi and 190 Ksi) of A723 steel has been modeled, and the life predictions using the model have verified that a field loading cycle is equivalent to a laboratory pressurization loading cycle. One key assumption in the model is that a minimum crack initiator must be present in order to attain a one-to-one correlation. If the minimum crack initiator is not present, there will be a large error between laboratory and field loading when predicting final fatigue failure. This study shows that a crack initiator greater that about 0.019 inch (for 166 Ksi yield strength steel) and 0.008 inch (for 190 Ksi yield strength steel) will result in the one-to-one correlation that is sought. No attempt has been made to model environmental effects that can greatly affect the results presented here.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1999
- Accession Number
- ADA369960
Entities
People
- C. Mossey
- E. Troiano
- John H. Underwood
Organizations
- United States Army Armament Research, Development and Engineering Center