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A Unified Approach to Modeling Material Behavior and Microstructure Evolution in Machining of OFHC Copper

[+] Author Affiliations
Rui Liu, Meisam Salahshoor, Shreyes N. Melkote

Georgia Institute of Technology, Atlanta, GA

Jayanti Subramaniam, Troy Marusich

Third Wave Systems, Minneapolis, MN

Paper No. MSEC2014-4180, pp. V001T01A011; 10 pages
doi:10.1115/MSEC2014-4180
From:
  • ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference
  • Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing
  • Detroit, Michigan, USA, June 9–13, 2014
  • Conference Sponsors: Manufacturing Engineering Division
  • ISBN: 978-0-7918-4580-6
  • Copyright © 2014 by ASME

abstract

At a fundamental level, the thermo-mechanical response of metals in dynamic deformation processes such as machining is governed by dislocation processes and associated microstructure evolution. However, the most commonly used material constitutive models in machining are phenomenological (e.g. Johnson-Cook) or semi-phenomenological (e.g. Zerilli-Armstrong) and do not explicitly account for the dependence of material flow stress on dislocation and microstructure evolution processes in a unified manner. The fidelity of machining simulation models is dependent on the amount of micro-scale physics captured in the development of 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 modeling approach that explicitly accounts for dislocation and microstructure evolution processes underlying the finite deformation process. The corresponding evolution laws are formulated and integrated into the constitutive model, which is derived from thermal activation theory and is an additive decomposition of athermal and thermal components of flow stress representing the effects of long-range and short-range obstacles to dislocation motion, respectively. The unified scheme is implemented as a user-defined subroutine in the AdvantEdge™ software (Third Wave Systems LLC) and used to simulate the orthogonal cutting of OFHC copper.

Copyright © 2014 by ASME
Topics: Copper , Machining , Modeling

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