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A FE based machining simulation methodology accounting for cast iron microstructure

Goran Ljustina (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Ragnar Larsson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Martin Fagerström (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik)
Finite elements in analysis and design (0168-874X). Vol. 80 (2014), p. 1-10.
[Artikel, refereegranskad vetenskaplig]

In the present paper the effect of graphite nodularity in the microstructure of cast iron is assessed with respect to its machinability at orthogonal cutting. A micro-structure based model of the cast iron material has been developed based on analyses of micro-graph images. The image analysis combines pearlitic grains with graphite nodules to produce the micro-structures. Continuous deformation behavior of pearlite and graphite phases is described using the Johnson-Cook (JC) viscoplasticty model including temperature dependence. Of particular concern is the modeling of the chip formation, induced by the micro-structure morphology and the mechanical behavior of the work piece material in the vicinity of the insert. This is described by the element deletion methodology along with the Johnson-Cook failure criterion to realize the fracture kinematics. A parametric study is carried out by varying the nodularity of the graphite. To validate the model, the finite element results are compared to machining test results carried out on a Compacted Graphite Iron (CGl) material in a related paper It turns out that the FE-simulated and experimentally observed cutting force and chip formation compare fairly well.

Nyckelord: Machining simulation, Cast iron, Microstructure, CGI, Nodularity, Johnson-Cook model, Chip formation, Fracture modeling



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Denna post skapades 2013-11-30. Senast ändrad 2016-02-01.
CPL Pubid: 187948

 

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