A unified material model including dislocation drag and its application to simulation of orthogonal cutting of OFHC Copper

作者：Liu R^*; Salahshoor M; Melkote S N; Marusich T

来源：Journal of Materials Processing Technology, 2015, 216: 328-338.

DOI：10.1016/j.jmatprotec.2014.09.021

• Dislocation drag
• Unified material model
• OFHC Copper
• Machining

The fidelity of machining simulation models is dependent on the amount of micro-scale physics captured in the material constitutive law, microstructure evolution law(s), and the unifying scheme integrating microstructure evolution into the constitutive law. This paper presents a unified material model that explicitly accounts for dislocation and microstructure evolution processes as well as dislocation drag as a plausible deformation mechanism applicable at the high strain rates common, in high speed cutting operations. The unified model is calibrated and implemented in the AdvantEdge (TM) 2-D machining simulation software and utilized to simulate the orthogonal cutting of OFHC Copper. Comparison of the predicted cutting forces with experimental data reveals that the model is reasonably accurate. The experimentally observed trend of severe grain refinement in OFHC Cu chips is predicted quite well by the model. The model was further utilized to analyze the evolution of deformation field parameters, i.e. plastic strain and the Zener-Hollomon parameter, in orthogonal cutting as well as to generate microstructure-deformation maps. The model predictions of severe grain refinement in the chip at high plastic strains and low Zener-Hollomon parameter values are found to be consistent with experimental trends reported in the literature.

• 出版日期2015-2