An Engineering Approximation On The Transformation Of Plastic Work Into Heat At Various Strain Rates And Stress States
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Date
2025
Publication Type
Conference Paper
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yes
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Abstract
Accurate estimation of plastic work conversion into heat is crucial for analyzing metals under dynamic deformation. This study investigates DP800 sheet metal specimens across nine strain rates (0.001/s to 150/s) using notched tension (NT) and shear (SH) specimens to explore stress-state effects. Surface strain fields are monitored via digital image correlation (DIC) using a high-speed optical camera, while temperature rise due to plastic dissipation is measured using a high-speed infrared camera. A temperature rise of 170K is observed at 150/s, with minimal rise at 0.001/s. A Hill'48 yield surface combined with a modified Johnson-Cook hardening law accurately predicts force-displacement and strain histories. We compare two methods of treating the conversion of the plastic work into heat: (1) coupled thermo-mechanical simulations, which are accurate but computationally expensive, and (2) treating temperature as an internal state variable, neglecting heat transfer. We then propose a transition function incorporating both strain rate and stress state dependencies, enabling the internal variable method to achieve comparable accuracy to coupled thermo-mechanical simulations with a marginal increase in computational cost over pure mechanical analysis.
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Publication status
published
Book title
44th Conference of the International Deep Drawing Research Group (IDDRG 2025)
Journal / series
Volume
408
Pages / Article No.
2017
Publisher
EDP Sciences
Event
44th Conference of the International Deep Drawing Research Group (IDDRG 2025)
Edition / version
Methods
Software
Geographic location
Date collected
Date created
Subject
Thermo-mechanical analysis; Stress state dependency; Adiabatic heating; Dynamic behavior of materials
Organisational unit
09473 - Mohr, Dirk / Mohr, Dirk