Geers, Marc

Remmers, Joris

van Dommelen, Hans

Westbeek, Steyn

English

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 Modeling for particle filled 3D printingCitation for published version (APA):Westbeek, S., Remmers, J., van Dommelen, H., & Geers, M. (2019). Modeling for particle filled 3D printing:predicting residual stress and deformation through a multi-physical and multi-scale numerical. Poster sessionpresented at Mate Poster Award 2019: 24th annual poster contest, Eindhoven, Netherlands.Document status and date:Published: 07/11/2019Document Version:Publisher’s PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can beimportant differences between the submitted version and the official published version of record. Peopleinterested in the research are advised to contact the author for the final version of the publication, or visit theDOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and pagenumbers.Link to publicationGeneral rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright ownersand it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.            • Users may download and print one copy of any publication from the public portal for the purpose of private study or research.            • You may not further distribute the material or use it for any profit-making activity or commercial gain            • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the “Taverne” license above, pleasefollow below link for the End User Agreement:www.tue.nl/taverneTake down policyIf you believe that this document breaches copyright please contact us at:openaccess@tue.nlproviding details and we will investigate your claim.Download date: 08. Feb. 2024Modeling for particle filled 3D printingPredicting residual stress and deformation through a multi-physicaland multi-scale numerical frameworkSteyn Westbeek, Joris Remmers, Hans van Dommelen, Marc GeersMechanical Engineering / Materials Technology / Mechanics of Materials s.westbeek@tue.nlVat photopolymerization or stereolithography is a versatile Additive Manufacturing (AM) technique broadly used forfunctional high quality polymer products. This technique can be used to produce composites or ceramic parts, byadding ceramic particles to the polymer. As the inclusion of the powder filler results in a more complex irradiation andthermo-mechanical behavior of thematerial, multi-physical andmulti-scale numerical models are generated to furtherthe understanding of the print process. From small to large, these length scales are referred to as the micro-, meso-and macro-scale, with application to an alumina filler.Micro-scaleEffective thermo-mechanicalproperties are obtained from ahomogenization approach onmicro-structural representativevolume element (RVE)realizations. The large scaleseparation with the macro-scale allows fora homogeneous intensity assumption and,correspondingly, provides homogeneous conversionwithin the RVE.2.2 µmMeso-scaleAn intermediate length scaleis introduced to capture thelight scattering caused by thedifference in refractive indexbetween powder inclusion and resin.The broadened cure profile is capturedby a parameterized law which conservesinput laser energy and effective conversion insidethe domain.t=0.50 s t=1.00 s t=1.50 s t=2.00 s0.00.20.40.60.81.0degreeofconv.[-]40µmMacro-scaleThe part fabrication process is simulated using homogenized propertiesfrom themicro- andmeso-scale in a thermo-mechanical framework.The chemical conversion causes thermal shrinkagewhile the exothermic photopolymerization heatinduces thermal expansion.Increasing the immersedcomputational domain layer-by-layerensures correct capturingof the cumulativeshrinkage effectin AM.∆ x⃗ × 100.100.080.060.040.020.00VonMisesstress[GPa]750µmUsing the developedmulti-scale framework, themulti-physical nature of the filled vat photopolymerization process canbe studied. The combination of the different length scales provides insight in the influence of the particulate inclusionson the required material and process conditions. In the end, this will further assist to obtain the intended final productfirst-time-right.

Modeling for particle filled 3D printing:predicting residual stress and deformation through a multi-physical and multi-scale numerical

https://pure.tue.nl/ws/files/139787819/2019_12_MaTePoster_SteynWestbeek.pdf

Modeling for particle filled 3D printing:predicting residual stress and deformation through a multi-physical and multi-scale numerical

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