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The Effect of Temperature and Load Cycling on the Relaxation of Residual Stresses

Published online by Cambridge University Press:  06 March 2019

J. M. Potter  and
R. A. Millard
J. M. Potter
Affiliation:
Air Force Flight Dynamics Laboratory Wright-Patterson Air Force Base
R. A. Millard
Affiliation:
Aeronautical Systems Division Wright-Patterson Air Force Base
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Abstract

The Fastress automatic residual stress measurement system was used to measure residual stress in unnotched shot peened 7075-T6 aluminum alloy specimens for a study of the effect of load and thermal exposure on residual stresses. Cyclic loads at zero and high mean stress conditions at stress levels in excess of those used in aircraft structures gave no apparent change in residual stress. Thermal exposure above 200°F resulted in significant changes in residual stress; at 225°F, 30 to 50 hours were required to cause the residual stress to reduce to onehalf the original value and less than 15 hours at 250°F was sufficient to cause a 50Z reduction. The data indicate that the cyclic load history that may be expected in aircraft structures is not sufficient to cause residual stress relaxation in areas remote from fasteners and other stress concentrations but that thermal exposure can cause significant relaxation.

Type
X-Ray Diffraction Stress Analysis
Information
Advances in X-Ray Analysis , Volume 20: Twenty-Fifth Annual Conference on Applications of X-ray Analysis, August 4-6, 1976 , 1976 , pp. 309 - 319
Copyright
Copyright © International Centre for Diffraction Data 1976

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References

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