Mesh objective damage modeling of ductile fracture at visco-plastic continuum response
Paper in proceedings, 2016

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.

Rate dependency

Mesh objective damage models

Johnson-cook model

Fracture modeling

Ductile damage

Author

SENAD RAZANICA

Chalmers, Applied Mechanics, Material and Computational Mechanics

Ragnar Larsson

Chalmers, Applied Mechanics, Material and Computational Mechanics

Lennart Josefson

Chalmers, Shipping and Marine Technology

ECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering

Vol. 1 209-215

Subject Categories

Mechanical Engineering

Materials Engineering

DOI

10.7712/100016.1805.11702

ISBN

978-618828440-1

More information

Created

10/7/2017