Publication:
Using x-ray diffraction to assess residual stresses in laser peened and welded aluminum

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Authors
Banazwski, Brian J.
Subjects
X-ray Diffraction
Residual Stresses
Laser Peening
AA5083;
Advisors
Brewer, Luke N.
Date of Issue
2011-12
Date
December 2011
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
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 in ship superstructures. X-ray diffraction was used to measure the residual stress distributions across welded and laser peened areas of welded aluminum plate. Full strain and stress tensors were measured and calculated in order to develop a fuller picture of the residual stress distribution in this complex geometry. Electropolishing was used to take residual stresses from specified depth below the surface. The tensor analysis was found to be extremely sensitive to the exact choice of diffraction angles used in the experiment, and an algorithm was developed to optimize the design of the diffraction experiment. Bi-axial stress analysis did show an increase in compressive stress from the laser peening after a couple tenths of a millimeter followed by a gradual decrease in compressive stress as depth increases.
Type
Description
Series/Report No
Department
Mechanical and Astronautical Engineering
Organization
Identifiers
NPS Report Number
Sponsors
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Format
xviii, 89 p. : col. ill. ; 28 cm.
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Distribution Statement
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.
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