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Plasticity-Induced Heating: Revisiting the Energy-Based Variational Model.

Christoph Hartmann1, Michael Obermeyer1

  • 1Chair of Metal Forming and Casting, Technical University of Munich, Walther-Meissner-Strasse 4, 85748 Garching near Munich, Germany.

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|March 13, 2024
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Summary
This summary is machine-generated.

This study presents a new method to estimate heat generated during plastic deformation using displacement fields. The approach improves predictions of tool wear in manufacturing processes.

Keywords:
Taylor–Quinney coefficientenergy-based variational modelplasticity-induced heatingtemperature evolutionthermo-visco-plastic model

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Mechanics

Background:

  • Understanding temperature changes during plastic deformation is crucial for manufacturing process design and predicting tool wear.
  • Existing experimental and numerical research often yields contradictory results regarding plasticity-induced heating.
  • Accurate estimation of thermo-mechanical coupling is essential for reliable simulations.

Purpose of the Study:

  • To analyze methods for estimating plasticity-induced heating directly from displacement fields.
  • To propose an alternative computational approach for modeling thermo-mechanical behavior.
  • To improve the accuracy of predicting temperature evolution during plastic deformation.

Main Methods:

  • Analysis of an energy-based variational formulation for coupled thermo-mechanical problems.
  • Development of an alternative purely thermal finite element simulation approach.
  • Incorporation of thermo-visco-plastic constitutive behavior (Johnson-Cook model).
  • Utilizing a heat source term based on the Taylor-Quinney coefficient to represent the fraction of plastic work converted to heat.

Main Results:

  • The proposed alternative method provides a practical approach for estimating plasticity-induced heating from displacement data.
  • The method integrates strain and strain rate data with a thermodynamically motivated model for heat conversion.
  • This approach offers a more consistent and reliable way to analyze temperature evolution compared to some existing methods.

Conclusions:

  • The developed finite element simulation method effectively estimates plasticity-induced heating using displacement fields.
  • This work contributes to more accurate modeling of thermo-mechanical phenomena in materials processing.
  • The findings can aid in optimizing manufacturing processes and enhancing tool wear prediction.