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dc.contributor.authorGeyin, Mertcanen_US
dc.date.accessioned2017-12-20T07:00:19Z
dc.date.available2017-12-20T07:00:19Z
dc.date.issued2016-06-27en_US
dc.identifier.othervt_gsexam:8096en_US
dc.identifier.urihttp://hdl.handle.net/10919/81274
dc.description.abstractMany offshore energy infrastructures are built on carbonate sands which are skeletal remains of marine organisms. Carbonate sands have a porous grain structure and are more compressible compared to quartzitic sand grains which are abundant in alluvial depositional environments. Consequently, there is a stark difference in material behavior of carbonate sands and it is difficult to characterize this distinct behavior with conventional methods. This study focuses on micro-scale characterization of carbonate and quartzitic sands to overcome this challenge. Experimental studies consist of nanoindentation tests performed on 17 different sands; 7 quartzitic and 10 carbonate sand samples. Mechanical properties of individual sand grains with different mineralogies are determined using nanoindentation. A force is applied by the nanoindenter on the grain surface and the load-displacement curve is developed. Modulus and hardness of individual sand grains are evaluated. Nanoindentation test results show that modulus and hardness of carbonate sands are significantly lower than quartzitic sands. For quartzitic grains, mechanical properties are relatively independent of indentation depth; whereas, for carbonate grains there is a considerable decrease in both Young's modulus and hardness values with increasing indentation depth. Results from this study can further be used for the evaluation of compressibility and strength characteristics of these two types of sands as part of a multi-scale analysis framework.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectNanoindentationen_US
dc.subjectQuartziticen_US
dc.subjectCarbonateen_US
dc.subjectYoung's Modulusen_US
dc.subjectHardnessen_US
dc.subjectStiffnessen_US
dc.titleMicro-Scale Characterization of Quartzitic and Carbonate Sand Grains Using Nanoindentationen_US
dc.typeThesisen_US
dc.contributor.departmentCivil and Environmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineCivil Engineeringen_US
dc.contributor.committeechairOlgun, Celal Guneyen_US
dc.contributor.committeememberFilz, George M.en_US
dc.contributor.committeememberRodriguez-Marek, Adrianen_US


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