Development of a feedforward laser control system for improving component consistency in Selective Laser Sintering

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dc.contributor.advisorBeaman, Joseph J.
dc.contributor.committeeMemberMilner, Thomas
dc.contributor.committeeMemberCrawford, Richard
dc.contributor.committeeMemberSeepersad, Carolyn
dc.contributor.committeeMemberFish, Scott
dc.creatorPhillips, Timothy Bryce
dc.creator.orcid0000-0002-8182-1841
dc.date.accessioned2019-09-16T15:04:15Z
dc.date.available2019-09-16T15:04:15Z
dc.date.created2019-05
dc.date.issued2019-06-18
dc.date.submittedMay 2019
dc.date.updated2019-09-16T15:04:16Z
dc.description.abstractSelective Laser Sintering makes up a significant portion of the polymer additive manufacturing market and is often the process of choice for structurally significant polymer components. With its expanding market, especially among end-use components, comes a growing need for improving reproducibility. Components built using Selective Laser Sintering display a large range among their mechanical properties and it has been shown that the thermal history of the building process has a strong influence over these variations. Temperature fluctuations of just a few degrees can mean the difference between scrapped parts or those with excellent mechanical and dimensional properties. This dissertation will introduce a novel method of reducing temperature and mechanical variations among parts. Physical simulations and empirical measurements of laser-polymer interaction are evaluated and used to guide development of an advanced laser power controller. The feedforward control system developed uses thermal imagery and dynamic surrogate modeling to systematically modulate laser energy impinging on the polymer surface to homogenize post-sintering temperatures. Results from thermal and mechanical tests will be presented, showing the laser control system is capable of reducing standard deviations by up to 57% for post-sintering temperature and 45% for ultimate flexural strength.
dc.description.departmentMechanical Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/75844
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/2946
dc.language.isoen
dc.subjectAdditive manufacturing
dc.subjectSelective Laser Sintering
dc.subjectProcess control
dc.subjectConsistency
dc.titleDevelopment of a feedforward laser control system for improving component consistency in Selective Laser Sintering
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentMechanical Engineering
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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