Local Temperature Development in the Fracture Zone during Uniaxial Tensile Testing at High Strain Rate: Experimental and Numerical Investigations

The quality of simulation results significantly depends on the accuracy of the material model and parameters. In high strain rate forming processes such as, e.g., electromagnetic forming or adiabatic blanking, two superposing and opposing effects influence the flow stress of the material: strain rat...

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Bibliographic Details
Published in:Applied sciences 2022-02, Vol.12 (5), p.2299
Main Authors: Galiev, Elmar, Winter, Sven, Reuther, Franz, Psyk, Verena, Tulke, Marc, Brosius, Alexander, Kräusel, Verena
Format: Article
Language:English
Subjects:
Adiabatic
Adiabatic flow
Blanking
DC06
Deformation
Electromagnetic forming
Elongation
Force measurement
Hardening rate
Heat
Heating
High strain rate
high-speed forming
Investigations
Localization
material properties
numerical simulation
Parameter identification
Position measurement
Simulation
Steel
Strain
Strain analysis
Strain hardening
Temperature effects
Tensile tests
Tension tests
Workpieces
Yield strength
Yield stress
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Summary:The quality of simulation results significantly depends on the accuracy of the material model and parameters. In high strain rate forming processes such as, e.g., electromagnetic forming or adiabatic blanking, two superposing and opposing effects influence the flow stress of the material: strain rate hardening and thermal softening due to adiabatic heating. The presented work contributes to understanding these influences better by quantifying the adiabatic heating of the workpiece during deformation and failure under high-speed loading. For this purpose, uniaxial tensile tests at different high strain rates are analyzed experimentally and numerically. A special focus of the analysis of the tensile test was put on identifying a characteristic time- and position-dependent strain rate. In the experiments, in addition to the measurement of the force and elongation, the temperature in the fracture region is recorded using a thermal camera and a pyrometer for higher strain rates. Simulations are carried out in LS-Dyna using the GISSMO model as a damage and failure model. Both experimental and simulated results showed good agreement regarding the time-dependent force-displacement curve and the maximum occurring temperature.
ISSN:2076-3417
2076-3417
DOI:10.3390/app12052299