Investigating the effect of CP titanium microstructure on the mechanics of microscale machining

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buir.advisorKarpat, Yiğit
dc.contributor.authorAksın, Alp
dc.date.accessioned2019-09-13T05:59:47Z
dc.date.available2019-09-13T05:59:47Z
dc.date.copyright2019-09
dc.date.issued2019-09
dc.date.submitted2019-09-11
dc.departmentDepartment of Mechanical Engineeringen_US
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (M.S.): Bilkent University, Department of Mechanical Engineering, İhsan Doğramacı Bilkent University, 2019.en_US
dc.descriptionIncludes bibliographical references (leaves 113-120).en_US
dc.description.abstractMetal cutting in microscale brings along many challenges and unanswered questions. Mechanical response of the material to the micro-cutting process is one of them, since feed values and the edge radius of the tool can be in the magnitude of order of the material's grain size. In addition, the grain morphology of the material may affect process outputs. This study investigates microstructure effects of the commercially pure titanium (CP Ti) based on analytical and mechanistic modeling approaches. A slip line field model was studied considering fracture toughness and edge radius effects. Orthogonal micro-cutting tests were performed on different morphologies at feed levels ranging from 0.25 to 6 µm per revolution and cutting force data were collected. Cut chip thickness values were measured by using SEM and used as in-process output in the model. The model outputs were fit to force data and unknown model parameters were identified. Those determined parameters were compared with measurements. The study show that the rake angle and tool edge radius parameters have a consistent disparity between measured and identified values. Evidence of possible wear and material build up at the tool have been observed. Using Bayesian inference, possible range of rake angle values have been further investigated and probability distributions of the rake value were identified for different feed levels. Micromilling of CP titanium has also been considered and a relationship between microscale orthogonal cutting and micromilling has been sought. CP titanium was tested by conducting full immersion micromilling experiments based on mechanistic modeling. In uence of the grain morphology on model coefficients, surface texture and hardness have been discussed.en_US
dc.description.degreeM.S.en_US
dc.description.statementofresponsibilityby Alp Aksınen_US
dc.embargo.release2020-03-11
dc.format.extentxvii, 126 leaves : illustrations (some colour), charts ; 30 cm.en_US
dc.identifier.itemidB158121
dc.identifier.urihttp://hdl.handle.net/11693/52433
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectCP titaniumen_US
dc.subjectGrain morphologyen_US
dc.subjectMicrostructureen_US
dc.subjectMicromillingen_US
dc.subjectMicrocuttingen_US
dc.subjectSlip line field theoryen_US
dc.subjectBayesian inferenceen_US
dc.subjectMechanistic modelingen_US
dc.titleInvestigating the effect of CP titanium microstructure on the mechanics of microscale machiningen_US
dc.title.alternativeSaf titanyum mikroyapısının talaş kaldırma mekaniğine mikro ölçekte etkisinin araştırılmasıen_US
dc.typeThesisen_US

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