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The effect of single, shaped surface flaws on ductility in cast aluminum dog bone specimens in uniaxial tension

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dc.contributor.authorWardwell, Scott L., author
dc.contributor.authorMahmoud, Hussam, advisor
dc.contributor.authorAtadero, Rebecca, committee member
dc.contributor.authorShuler, Scott, committee member
dc.date.accessioned2017-09-14T16:04:34Z
dc.date.available2017-09-14T16:04:34Z
dc.date.issued2017
dc.description.abstractDuctile fracture of structural, metallic alloys is of great interest to the engineering community. This interest has sparked many attempts in an effort to describe the fracture process for these ductile materials. The theory that stands out is that ductile fracture is driven by the process of void nucleation, growth and coalescence which, as the name suggests, allows voids to be created through nucleation, then follows their growth and coalescence until material failure occurs. In this process, a damage criterion is often selected and used to model and predict how ductile fracture will occur. While this modeling yields results with enough accuracy to be useable in practical applications, it relies on some initial idealized void geometry. These geometries are usually of cylindrical or spherical nature and do not capture the essence of the actual void geometry of real materials. Surface flaws, on the other hand, are often modeled to mimic their actual appearance in real materials. This being the case, little research has been conducted on actual void geometry or highly specific, three-dimensional surface flaw geometry. This study explores these relatively untouched regions of geometrical interest and their effect on the ductile fracture process through physical testing of specifically shaped surface flaws on structural grade aluminum. Additionally, aluminum demonstrates unique properties with respect to ductility. Other ductile materials often yield in tension then continue to stretch and withstand additional loading up to some maximum material strength then stretch more until eventual failure. Many commercially available grades of aluminum however, fail almost immediately after reaching their maximum material strength. The results from this study are compared so that the effects of the specific shapes on ductility can be seen. The results suggest that, depending on the definition of ductility, it may be possible to easily increase material performance for ductile materials, which demonstrate the unique ductility profile seen in aluminum, by introducing specifically shaped surface flaws.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierWardwell_colostate_0053N_14272.pdf
dc.identifier.urihttps://hdl.handle.net/10217/183908
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectcast
dc.subjectflaw
dc.subjecttension
dc.subjectductile
dc.subjectaluminum
dc.subjectfracture
dc.titleThe effect of single, shaped surface flaws on ductility in cast aluminum dog bone specimens in uniaxial tension
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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