Fatigue Crack Propagation in an Explosion-Bonded 2024 Aluminum Plate.
ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS
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ION AND A MICROHARDNESS TRAVERSE WERE ALSO CONDUCTED AT THE BOND ZONE TO BETTER EVALUATE THE DIFFERENT BOND CONDITIONS. A fracture mechanics approach was used to investigate the effect of explosion bonding on fatigue crack growth. Crack growth rates were determined at increasing values of stress intensity factor. Specimens were obtained from areas of the plate which were determined to be bonded with few defects and from areas where it was determined that voids were present at the bond zone. Cracks were made to propagate perpendicular to the bonding direction as well as in the bonding direction and opposing the bonding direction. The test results show crack growth rates on the low side of the range as reported in the literature, with no apparent effect due to either void content or bonding direction. Author
- Metallurgy and Metallography