Baaijens, F.P.T.

Brekelmans, W.A.M.

Brokken, D.

English

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 Numerical modelling of the blanking processCitation for published version (APA):Brokken, D., Brekelmans, W. A. M., & Baaijens, F. P. T. (1996). Numerical modelling of the blanking process.Poster session presented at MaTe Poster Award 1996 : first annual poster contest.Document status and date:Published: 01/01/1996Document Version:Accepted manuscript including changes made at the peer-review stagePlease 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. 2024erialsaechnologyNumerical mode lling of the blanking pro cessD. Brokken, W.A.M. Brekelmans and F.P.T. BaaijensEindhoven University of Technology,Faculty of Mechanical Engineering,Section Materials Technology,P.O. Box 513, NL 5600 MB Eindhoventue1 Introduction6BlankholderPunchSheetDieBlankKnowledge : empirical⇓Process development :trial and error1.1 ObjectiveValidated finite element modelto predict product shape2 Problems2 Extreme deformation2 Ductile fracture2 Thermal and viscous effects2.1 Large deformation2 Operator Splitted ALE :1 Updated Lagrange step2 Update nodal positions3 Convective step :Discontinuous Galerkin :∫w(ϕg− ϕoldg − Eug · E∇ϕg)d−∑elems∫0iewEug · En (ϕg− ϕgext)d0︸ ︷︷ ︸Upwinding term= 03 ϕgext handled explicitly→ ϕg can be solved onelement level3 Renumbering in flow di-rection → fast conver-gence2 Frequent remeshing needed2.2 Ductile fracture2 Physics : growth and coales-cence of voids2 Modelling : Discrete Crack ap-proach3 Local Mesh ModificationAlgorithm :BABAMesh objectivity :3 Global Mesh Modifica-tion :Mesh generator :Conversion 4 → 2 : ⇒ ⇒ 2 Crack direction :3 Derived from crack po-tential (Damage likeparameter, no influ-ence on constitutivebehaviour)3 Potential from voidgrowth (Rice & Tracey)∫ ε̄ fp00.427exp3σm2σ̄dε̄p3 Results00.20.40.60.81Fracture potential00.20.40.60.81Fracture potential00.20.40.60.81Fracture potential4 Future2 Validation with experiments2 Inclusion viscous, thermal ef-fects

Numerical modelling of the blanking process

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Numerical modelling of the blanking process

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