VTechWorks staff will be away for the Thanksgiving holiday beginning at noon on Wednesday, November 27, through Friday, November 29. We will resume normal operations on Monday, December 2. Thank you for your patience.
 

Durability of Adhesive Joints Subjected to Environemntal Stress

Simple item page
dc.contributor.authorO'Brien, Emmett P.en
dc.contributor.committeechairWard, Thomas C.en
dc.contributor.committeememberDavis, Richey M.en
dc.contributor.committeememberDillard, David A.en
dc.contributor.committeememberMarand, Evaen
dc.contributor.committeememberSaraf, Ravi F.en
dc.contributor.departmentChemical Engineeringen
dc.date.accessioned2014-03-14T20:16:55Zen
dc.date.adate2003-10-03en
dc.date.available2014-03-14T20:16:55Zen
dc.date.issued2003-08-28en
dc.date.rdate2003-10-03en
dc.date.sdate2003-09-30en
dc.description.abstractEnvironmental stresses arising from temperature and moisture changes, and/or other aggressive fluid ingressions can degrade the mechanical properties of the adhesive, as well as the integrity of an adhesive interface with a substrate. Therefore such disruptions can significantly reduce the lifetime and durability of an adhesive joint.1-4 In this research, the durability of certain epoxy adhesive joints and coatings were characterized using a fracture mechanics approach and also by constant frequency impedance spectroscopy. The shaft-loaded blister test (SLBT) was utilized to measure the strain energy release rate (G) or adhesive fracture energy of a pressure sensitive adhesive tape. In this study, support for the value of the SLBT fracture mechanics approach was obtained. The SLBT was then used to investigate the effects of relative humidity on a model epoxy bonded to silicon oxide. Lastly, the effects of water and temperature on the adhesion of a commercial filled epoxy bonded to silicon oxide was characterized and interpreted. A novel impedance sensor for investigating adhesion was developed in a collaborative effort between Virginia Tech and Hewlett-Packard. Utilizing the technique of constant frequency impedance spectroscopy, the distribution and transport of fluids at the interface of adhesive joints was measured. A broad spectrum of adhesives was tested. In addition, the effects of hygroscopic cycling on the durability of adhesive coatings were measured for the commercial filled epoxy using the device. Lastly, recommended modifications of the experimental set-up with the new sensor are proposed to improve the technique.en
dc.description.degreePh. D.en
dc.identifier.otheretd-09302003-110117en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09302003-110117/en
dc.identifier.urihttp://hdl.handle.net/10919/29139en
dc.publisherVirginia Techen
dc.relation.haspartEmmettOBrienThesisFinal.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectinken
dc.subjectdielectric spectroscopyen
dc.subjectdiffusionen
dc.subjectelectrochemical impedance spectroscopy (EIS)en
dc.subjectepoxyen
dc.subjectinterfaceen
dc.subjectWateren
dc.subjectsub-critical crack growthen
dc.subjectdurabilityen
dc.subjectenvironmental degradationen
dc.subjectadhesionen
dc.subjectshaft-loaded blister testen
dc.titleDurability of Adhesive Joints Subjected to Environemntal Stressen
dc.typeDissertationen
thesis.degree.disciplineChemical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
EmmettOBrienThesisFinal.pdf
Size:
2.26 MB
Format:
Adobe Portable Document Format
Download

Collections

Doctoral Dissertations