Biaxial residual stress measured in aluminum plate before and after
M. B. Prime and M. R. Hill, "Residual Stress, Stress Relief,
and Inhomogeneity in Aluminum Plate," Scripta Materialia, 46,
pp. 77-82, 2002. preprint (pdf) . (LA-UR-01-4723)
3-inch (75 mm) thick rolled 7050 Aluminum, 6 inch by 6 inch (150 mm
by 150 mm) blocks
- Solution treated and stabilized (7050-T74)
- Stress relieved (7050-T7451) by stretching 1.5% to 3% in rolling
Two cuts each specimen:
- First cut to measure rolling direction (x) residual stresses.
- Second cut on half of specimen to measure transverse (y) residual
- Cuts made in 1 mm depth increments.
- Strain at each depth measured on top face (gages shown in picture)
and back face (not visible) of specimens.
Residual stresses reduced by about a factor of 10. No problems measuring
the stresses, even the low stresses after stress relief. These results are
similar to other measurements, see Aluminum, Vol III., Fabrication &
Finishing, by ALCOA
Before stress relief
After stress relief
NOTE: The raw data from this test and any other data I have can be made
available for research purposes. Just email