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dc.contributor.authorWang, Xuchen
dc.date.accessioned2020-08-10T20:08:05Z
dc.date.available2020-08-10T20:08:05Z
dc.date.issued2020-05
dc.identifier.otherWang_cornell_0058O_10914
dc.identifier.otherhttp://dissertations.umi.com/cornell:10914
dc.identifier.urihttps://hdl.handle.net/1813/70323
dc.description41 pages
dc.description.abstractWith the advent of advanced testing strategies like laser-induced particle impact test, it is possible to study materials mechanics under extremely high deformation rates, i.e., above 10^6 s^-1, a relatively less explored regime of strain rates. In this study, we accelerate microparticles of commercially pure titanium to ~100 m/s towards a rigid substrate and record their deformation upon impact in real time. We also conduct finite element modeling of the experimentally recorded impacts using two constitutive equations: Johnson-Cook and Zerilli-Armstrong. We show that titanium microparticles experience strain rates in the range of 10^6-10^10 s^-1 upon impact. We evaluate the capability of the Johnson-Cook and Zerilli-Armstrong equations in predicting material response at ultra-high strain rates. With an optimization-based constitutive modeling approach, we also propose updated strain rate-related constitutive parameters for both equations that can improve the extent to which they can successfully describe the deformation of materials at higher strain rates.
dc.language.isoen
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectConstitutive Modeling
dc.subjectImpact
dc.subjectJohnson-Cook
dc.subjectTitanium
dc.subjectUltra-High Strain Rate
dc.subjectZerilli-Armstrong
dc.titleULTRA-HIGH STRAIN RATE CONSTITUTIVE MODELING OF PURE TITANIUM USING PARTICLE IMPACT TEST
dc.typedissertation or thesis
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorCornell University
thesis.degree.levelMaster of Science
thesis.degree.nameM.S., Mechanical Engineering
dc.contributor.chairHassani Gangaraj, Seyyed Mostafa
dc.contributor.committeeMemberZehnder, Alan
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/0nsp-3e86


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