An investigation of residual stresses in simulated wing panels of 7075-T6 aluminum.
investigationofr00engl.pdf (2.282Mb)Abstract
The advent of onboard aircraft microprocessor fatigue monitoring systems will establish the opportunity to fully exploit residual stresses at stress-critical areas, including their effects on fatigue predictions. An experimental investigation was undertaken to more fully understand them by making photoelastic measurements of residual stresses at notches in simulated wing panels of 7075-T6 aluminum and to establish the relationships between the local stresses, residual stresses, and the far-field or applied stress. The stress concentration factors were found to decrease with increased plastic deformation while the strain concentration factors were found to remain constant. The residual stress levels were found to be immutable despite changes in fatigue loading conditions, notch geometry, or test duration.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
Related items
Showing items related by title, author, creator and subject.
-
Systematic review of ultrasonic impact treatment parameters on residual stresses of welded non-sensitized versus sensitized aluminum-magnesium
(Monterey, California: Naval Postgraduate School, 2015-03);This thesis focuses on the use of x-ray diffraction to measure residual stresses around welds in 5XXX series aluminum-alloys used in naval ship structures both in the laboratory and the field. Tensile residual stresses are ... -
Using x-ray diffraction to assess residual stresses in laser peened and welded aluminum
(Monterey, California. Naval Postgraduate School, 2011-12);This thesis examines the interplay of residual stress distributions caused by welding and laser peening of marine aluminum alloy 5083. Residual stresses at welds in this alloy can cause fatigue and stress corrosion cracking ... -
Systematic review of UIT parameters on residual stresses of sensitized AA5456 and field based residual stress measurements for predicting and mitigating stress corrosion cracking
(Monterey, California: Naval Postgraduate School, 2014-03);This thesis focuses on the use of x-ray diffraction to measure residual stresses around welds in aluminum ship structures both in the laboratory and in the field. Tensile residual stresses are often generated during welding ...
