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A thermodynamically consistent formulation of the Johnson–Cook model

Article dans une revue avec comité de lecture
Auteur
ccMAREAU, Charles
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]

URI
http://hdl.handle.net/10985/24402
DOI
10.1016/j.mechmat.2020.103340
Date
2020-02-07
Journal
Mechanics of Materials

Résumé

The model of Johnson and Cook, which includes a viscoplastic flow rule and a damage criterion, is widely used to describe the mechanical behaviour of metallic materials subjected to severe loading conditions, such as those encountered during fabrication operations or impact. This model has been built on empirical, rather than physical, grounds. The present paper therefore aims at revisiting the model of Johnson and Cook from the view point of thermodynamics with internal variables. The interest of this approach is twofold. First, it provides a guide for the construction of a complete thermomechanical constitutive model, with some constitutive relations not only for the stress tensor but also specific internal energy, specific entropy and heat flux vector. Second, it allows highlighting some possible limitations of the original model of Johnson and Cook. Such limitations can be circumvented with an alternative model, which is described in the present work. For illustration purpose, some applications of both the original and alternative models are presented in the final section.

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  • Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

Documents liés

Visualiser des documents liés par titre, auteur, créateur et sujet.

  • High Cycle Fatigue Strength of Punched Thin Fe-Si Steel Sheets 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (2016)
    Some parts of electrical machines are built from stacks of thin steel sheets, for which the coarse grain microstructure allows for minimizing magnetic losses. The fabrication process of these parts usually involves punching ...
  • Study of the contribution of different effects induced by the punching process on the high cycle fatigue strength of the M330-35A electrical steel 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (ESIS - Elsevier, 2016)
    Because of their improved magnetic properties, Fe-Si alloys are widely used for new electric motor generations. The use of punching process to obtain these components specially affects their mechanical behavior and fatigue ...
  • Experimental study of the impact of punching operations on the high cycle fatigue strength of Fe-Si thin sheets 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (Elsevier, 2016)
    In this paper, the impact of punching operations on the high cycle fatigue strength of Fe–Si thin sheets is investigated. High cycle fatigue tests are performed on both punched and polished edge specimens. Results show a ...
  • Characterization and simulation of the effect of punching on the high cycle fatigue strength of thin electric steel sheets 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (Elsevier, 2015)
    Rotors of electric machines are built from stacks of thin steel sheets. The fabrication process of these components usually involves punching operations that generate defects on the steel sheet edges. In this study, high ...
  • High cycle fatigue strength assessment methodology considering punching effects 
    Article dans une revue avec comité de lecture
    DEHMANI, Helmi; ccPALIN-LUC, Thierry; ccMAREAU, Charles; KOECHLIN, Samuel; ccBRUGGER, Charles (Elsevier, 2018)
    Since a decrease of the fatigue strength may result from punching operations, this study proposes a methodology for designing punched parts against high cycle fatigue crack initiation. To reach this goal, high cycle fatigue ...

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