Prediction of ductile fracture in metal blanking

A.M. Goijaerts, L.E. Govaert, F.P.T. Baaijens

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Abstract

This study is focused on the description of ductile fracture initiation, which is needed topredict product shapes in the blanking process. Two approaches are elaborated using alocal ductile fracture model. According to literature, characterization of such a modelshould take place under loading conditions, comparable to the application. Therefore, thefirst approach incorporates the characterization of a ductile fracture model in a blankingexperiment. The second approach is more favorable for industry. In this approach atensile test is used to characterize the fracture model, instead of a complex and elaborateblanking experiment. Finite element simulations and blanking experiments are performedfor five different clearances to validate both approaches. In conclusion it can be statedthat for the investigated material, the first approach gives! very good results within theexperimental error. The second approach, the more favorable one for industry, yieldsresults within 6 percent of the experiments over a wide, industrial range of clearances,when a newly proposed criterion is used.
Original languageEnglish
Pages (from-to)476-483
JournalJournal of Manufacturing Science and Engineering : Transactions of the ASME
Volume122
Issue number3
DOIs
Publication statusPublished - 2000

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