Fatigue Crack Growth of 5456-H116 Aluminum and HSLA-80 Weldments
Abstract
Fatigue crack growth rate experiments were performed on 4W-type compact tension specimens of baseplate and weldments of 5556-H116 A1 and of baseplate and HAZ of HSLA-80 steel. Stress ratios for the tests were 0.1 for both materials with the A1 weld also being tested at R=0.5. Crack opening levels were determined for both the weld and baseplate in the aluminum material and for the A710 material in the as-welded and as-stress relieved conditions. The fatigue crack growth rates, when using the total applied load, of the welds and HAZ were significantly less than those of plate for both materials. Using the effective stress intensity at the crack tip, results in a shift of the da/dN versus delta K curves to a faster growth rate. Comparison of the curves show that the fatigue crack growth rates of the aluminum material fall in the same scatter band of data for baseplate, and for the HSLA-80 material the growth rate of the HAZ is shifted to faster growth rates than the baseplate. This shift of data leads to more conservative estimates on fatigue life. Keywords: Physical metallurgy, Metal properties, Crack propagation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1988
- Accession Number
- ADA197830
Entities
People
- L. R. Link