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Mesh objective damage modeling of ductile fracture at visco-plastic continuum response

Senad Razanica (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Ragnar Larsson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Lennart Josefson (Institutionen för sjöfart och marin teknik)
ECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering Vol. 1 (2016), p. 209-215.
[Konferensbidrag, refereegranskat]

Local-continuum damage models, such as the JC-dynamic failure criterion are often combined with the constitutive JC-model to represent the material behavior during machining. The major drawback is that the failure criterion exhibit a pathological mesh dependence. In literature it has been argued that a viscous regularization of the continuum material model coupled to damage via visco-plasticity may remove the mesh dependence. We present results, based on the objective enhanced element removal model derived from previous contribution, form a mesh dependence study using a extended formulation of the constitutive JC-model covering visco-plasticity. The results show that, excluding the mesh objective enhancement the pathological mesh dependence still exist if the visco-plastic formulation is used. If the mesh objective enhancement is used a relatively good convergence is obtained for a set of mesh sizes for the damage model.

Nyckelord: Ductile damage, Fracture modeling, Johnson-cook model, Mesh objective damage models, Rate dependency

Denna post skapades 2017-01-26.
CPL Pubid: 247722


Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Material- och beräkningsmekanik (2005-2017)
Institutionen för sjöfart och marin teknik (2005-2017)



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