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Mechanical behavior and damage mechanisms of woven graphite-polyimide composite materials

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dc.contributor.authorWagnecz, Lindaen
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2014-03-14T21:40:56Zen
dc.date.adate2010-07-21en
dc.date.available2014-03-14T21:40:56Zen
dc.date.issued1987en
dc.date.rdate2010-07-21en
dc.date.sdate2010-07-21en
dc.description.abstractThe behavior of 8-harness satin woven Celion 3000/PMR-15 graphite-polyimide was experimentally investigated. Unnotched and center-notched specimens from (0)₁₅, (0)₂₂, and (0,45,0, - 45,0,0, - 45,0,45,0)₂ laminates were tested. Material properties were measured and damage development documented under monotonic tension, sustained incremental tension, and tension-tension fatigue loading. Damage evaluation techniques included stiffness monitoring, penetrant-enhanced X-ray radiography, laminate deply, and residual strength measurement. Material properties of the woven graphite-polyimide were comparable to those of woven graphite-epoxy. Damage development in woven graphite-polyimide was quite different than in non-woven graphite-epoxy. Matrix cracking was denser and delamination less extensive in the graphite-polyimide material system, and as a result, increases in notched residual tensile strength were much lower. A ply level failure theory was used to successfully predict the notched tensile strength of the (0,45,0, - 45,0,0, - 45,0,45,0)₂ laminate based on experimental data from the (0)₂₂ laminate. A simple method was used to simulate fatigue damage in a (0)₂₂ notched specimen to predict residual strength as a function of fatigue life. The advantages and disadvantages of the ply level failure theory used in this study are discussed.en
dc.description.degreeMaster of Scienceen
dc.format.extentxi, 154 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-07212010-020200en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-07212010-020200/en
dc.identifier.urihttp://hdl.handle.net/10919/43831en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1987.W335.pdfen
dc.relation.isformatofOCLC# 16796324en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1987.W335en
dc.subject.lcshComposite materialsen
dc.subject.lcshGas-turbines -- Bladesen
dc.subject.lcshGraphiteen
dc.subject.lcshPolyimidesen
dc.titleMechanical behavior and damage mechanisms of woven graphite-polyimide composite materialsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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