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Numerical analysis of crack propagation during the burr formation process of metals

: Regel, J.; Stoll, A.; Leopold, J.

Micari, F.; Filice, L. ; University of Calabria, Rende:
10th CIRP International Workshop on Modeling of Machining Operations. Proceedings : August 27-28, 2007, Reggio Calabria, Italy
Rende: University of Calabria, Department of Mechanical Engineering, 2007
ISBN: 978-88-95267-04-3
International Workshop on Modeling of Machining Operations <10, 2007, Reggio Calabria>
Conference Paper
Fraunhofer IWU ()
burr formation; crack initiation; hydrostatic bowl; finite element simulation

Because of increased productivity demands in manufacturing the attention in burr problems is steadily turned to avoid of burr. With this initial point this article contributes to the analysis and simulation of burr separation at work piece material AISI 1045. Twelve known crack initiation criteria are investigated whether they are suitable to simulate crack initiation during burr formation. It is shown that eight criteria are suitable for the prediction of cracks, whereas the Cockcroft-Latham criteria have been pointed out. The implementation of the failure conception of ductile damage from Lemaitre and Sievert indicates the applicability for burr formation simulation with simultaneous simulation of segmented chips. At the end the hypothesis of the "hydrostatic bowl" is used to predict the location of crack initiation. The established values correlate better to the experimental test than these, which are determined by means of the fracture criteria.