Show simple item record

dc.contributor.advisorMcNelley, Terry R.
dc.contributor.authorEsarey, John Gilbert
dc.dateSeptember 1992
dc.date.accessioned2012-11-29T16:13:53Z
dc.date.available2012-11-29T16:13:53Z
dc.date.issued1992-09
dc.identifier.urihttp://hdl.handle.net/10945/23592
dc.description.abstractMany materials processing operations such as age hardening heat treatments typically involve following predetermined time and temperature schedules to obtain the desired final material properties. The intelligent processing approach is to develop sensors for monitoring of material response to processing operation in real time. As an alloy age hardens its electrical resistivity changes. Hence, the process of aging can be monitored by measuring the change is resistivity relative to that of a non-age hardening material such as fully annealed aluminum. A device using two small, spiral-wound probes was designed to induce eddy currents within the pure aluminum and the aging alloy. The probes were incorporated as elements in an impedance bridge circuit. The bridge unbalance voltage decreased in value over time indicating decreasing relativity during the aging process. The monitoring concept was verified. Refinements such as improved impedance bridge circuitry and probe size/test frequency optimization are needed to unlock its full potential.en_US
dc.description.urihttp://archive.org/details/continuousmeasur1094523592
dc.format.extent38 p.en_US
dc.language.isoen_US
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.titleContinuous measurement by eddy current methods of age hardening in aluminum alloysen_US
dc.typeThesisen_US
dc.contributor.corporateNaval Postgraduate School
dc.contributor.departmentMechanical Engineering
dc.subject.authorEddy current monitoringen_US
dc.subject.authorResistivity measurementen_US
dc.subject.authorAge hardeningen_US
dc.subject.authorPrecipation hardeningen_US
dc.description.serviceLieutenant, United States Navyen_US
etd.thesisdegree.nameM.S. 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.


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record