Abstract
Non-local damage model for strain softening in a machining simulation is presented in this paper. The coupled damage-plasticity model consists of a physically based dislocation density model and a damage model driven by plastic straining in combination with the stress state. The predicted chip serration is highly consistent with the measurement results.
Highlights
The introduction of strain or thermal softening to a material model gives rise to localized deformation
Non-local damage model for strain softening in a machining simulation is presented in this paper
The coupled damage-plasticity model consists of a physically based dislocation density model and a damage model driven by plastic straining in combination with the stress state
Summary
The introduction of strain or thermal softening to a material model gives rise to localized deformation. An enrichment with a physical attraction is the non-local model, as discussed in previous studies [1]. Non-local models incorporate a characteristic length scale that can be related to the width of the localized zone. This enables a mesh-independent solution in the finite element analysis. This work is concerned with the implementation of a non-local damage model in a commercial code, MSC.Marc[2] to be used for machining simulations. The ability to combine the implementation with remeshing is important This approach is based on a previous study of the stability and accuracy of various simplifications required in the current context [3]. The simulation results show the effect of characteristic length scale in the damage model in terms of chip formation and its serrations
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