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dc.contributor.advisorMenon, Sarath
dc.contributor.advisorBrewer, Luke N.
dc.contributor.authorFakhouri, Eid Faiz
dc.dateMarch 2015
dc.date.accessioned2015-05-06T19:17:36Z
dc.date.available2015-05-06T19:17:36Z
dc.date.issued2015-03
dc.identifier.urihttp://hdl.handle.net/10945/45184
dc.description.abstractThis 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 commonly generated during welding and, in sensitized alloys, can cause stress corrosion cracking. Peening techniques, such as ultrasonic impact treatment (UIT), can mitigate and possibly reverse these tensile residual stresses. This research uses x-ray diffraction to measure residual stresses around welds in AA5456 after UIT, around welds in AA5083 installed on-board a U.S. naval combatant and in AA5083 after in situ surface preparation. In the AA5456, we examined the importance of UIT parameters such as peening amplitude and pin size. It was found that all combinations of UIT parameters produced significant compressive stress but that some combinations resulted in extensive subsurface intergranular cracking in the sensitized AA5456. Optimal UIT parameters for mitigating the production of subsurface cracking were determined. In the AA5083, we examined the effect of field-based in situ surface preparation on residual stress measurements. The use of a portable x-ray diffractometry system to experimentally measure the distribution of residual stresses in aluminum-alloy ship structures on U.S. Navy vessels has been successfully demonstrated.en_US
dc.description.urihttp://archive.org/details/systematicreview1094545184
dc.publisherMonterey, California: Naval Postgraduate Schoolen_US
dc.rightsThis 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.en_US
dc.titleSystematic review of ultrasonic impact treatment parameters on residual stresses of welded non-sensitized versus sensitized aluminum-magnesiumen_US
dc.typeThesisen_US
dc.contributor.departmentMechanical And Aerospace Engineeringen_US
dc.contributor.departmentMechanical and Aerospace Engineering (MAE)
dc.subject.authorUITen_US
dc.subject.authorultrasonic impact treatmenten_US
dc.subject.authorresidual stressen_US
dc.subject.authoraluminum-alloysen_US
dc.subject.authorXRDen_US
dc.subject.authorx-ray diffractionen_US
dc.subject.authorAA5456en_US
dc.subject.authorAA5083en_US
dc.subject.authorelectropolishingen_US
dc.subject.authormetallographyen_US
dc.subject.authorsub-surface crackingen_US
dc.subject.authorSCCen_US
dc.subject.authorstress corrosion crackingen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameMaster of Science in Mechanical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineMechanical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US
dc.description.distributionstatementApproved for public release; distribution is unlimited.


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