A study of near tip phenomena for cracks in a particulate composite

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dc.contributor.authorRezvani, Mohamad A.en
dc.contributor.committeechairSmith, Charles W.en
dc.contributor.committeememberPost, D.en
dc.contributor.committeememberMeirovitch, Leonarden
dc.contributor.committeememberPlaut, Raymond H.en
dc.contributor.committeememberCzarnek, R.en
dc.contributor.departmentEngineering Mechanicsen
dc.date.accessioned2015-07-09T20:43:29Zen
dc.date.available2015-07-09T20:43:29Zen
dc.date.issued1989en
dc.description.abstractAn experimental investigation using grids with a frequency of 125 lines/in. (5 lines/mm) was performed on inert propellant and pure binder at two different global head rates of 0.1 in./min (2.5 mm/min) and 1.0 in./min (25.4 mm/min). From the extracted data, displacements, strains, and dominant eigenvalue for displacement were calculated. An idealized model was used to explain the high strain zone ahead of inert propellant that caused severe blunting at the crack tip. Using the available algorithms and three dimensional photoelasticity, the dominant stress singularity order values were calculated in a four point single edged cracked bend specimen with both straight front and thumbnailed cracks. The free surface values are the same as for the inert propellant and in good agreement with analytical values. A boundary layer is observed in the singularity order which extends towards the mid-plane of the specimen. This region is about twenty percent of the distance from the free surface to mid-depth of the fractured body. The slow and fast head rates alter the global behavior of the specimen as well as the density of the displacement and strain contours. However, the near tip mechanisms are not altered.en
dc.description.degreePh. D.en
dc.format.extentx, 99 leavesen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/54272en
dc.language.isoen_USen
dc.publisherVirginia Polytechnic Institute and State Universityen
dc.relation.isformatofOCLC# 20347689en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V856 1989.R498en
dc.subject.lcshFracture mechanicsen
dc.subject.lcshComposite materials -- Fractureen
dc.titleA study of near tip phenomena for cracks in a particulate compositeen
dc.typeDissertationen
dc.type.dcmitypeTexten
thesis.degree.disciplineEngineering Mechanicsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.leveldoctoralen
thesis.degree.namePh. D.en

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