Material and failure characteristics for high-speed forming and cutting processes
High-speed processes can lead to significant technological advantages like an increased formability, reduced springback or an improved quality of cutting edges. For conventional forming processes, quasi-static conditions are a good approximation and numerical process optimisation is state of the art. However, there is still a need for research in the field of material characterisation for high speed forming and cutting processes. Production technologies with high velocities leads to high strain rates and the dependency of strain hardening and failure behaviour on the forming velocity cannot be neglected. Therefore, the data of the material behaviour at high strain rates is required for modelling high velocity processes. The challenge here is the measurement of relevant process quantities due to short process time that requires a very high sampling rate and the limited size and accessibility of the specimen. In this context, an inverse method for determining material characteristics at high strain rates was developed. The approach here is the measurement of auxiliary test parameters, which are easier to measure and then used as input data for an inverse numerical simulation. Two devices were implemented for different ranges of strain rates: a pneumatically driven device for strain rates up to 1.000 1/s and an electromagnetically driven accelerator for strain rates up to 100.000 1/s. The method developed by Psyk et al. is presented in detail in "Determination of Material and Failure Characteristics for High-Speed Forming via High-Speed Testing and Inverse Numerical Simulation". https://doi.org/10.3390/jmmp4020031
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Experimental data and FE-model for high-speed blanking of DC06 [1]
Based on the material properties determined in "Forming and cutting at high strain rates Part 1" and "Part 2", the applicability of the methodology and the material characteristics are verified using a high-spped blanking ... -
Experimental data and FE-model for tensile tests of DC06 at high strain rates [1]
In high strain rate forming processes two superposing and opposing effects influence the flow stress of the material: strain rate hardening and thermal softening due to adiabatic heating. The presented FE-model and ... -
Experimental data and FE-model for deep drawing DC06 at high strain rates [1]
Based on the material properties determined in "Forming and cutting at high strain rates Part 1" and "Part 2", the applicability of the methodology and the material characteristics are verified using a deep drawing process ... -
Experimental data and FE-model for an inverse material characterisation of DC06 at high strain rates [1]
High-speed processes can lead to significant technological advantages like an increased formability, reduced springback or an improved quality of cutting edges. For conventional forming processes, quasi-static conditions ...
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Forming and cutting at high strain rates Part 4: High-speed blanking
(Technische Universität DresdenFraunhofer Institute for Machine Tools and Forming Technology IWU, 2023)Based on the material properties determined in "Forming and cutting at high strain rates Part 1" and "Part 2", the applicability of the methodology and the material characteristics are verified using a high-spped blanking ... -
Forming and cutting at high strain rates Part 3: Deep drawing
(Technische Universität DresdenFraunhofer Institute for Machine Tools and Forming Technology IWU, 2023)Based on the material properties determined in "Forming and cutting at high strain rates Part 1" and "Part 2", the applicability of the methodology and the material characteristics are verified using a deep drawing process ... -
Forming at high strain rates Part 2: Analysis of adiabatic heating based on tensile tests of DC06
(Technische Universität DresdenFraunhofer Institute for Machine Tools and Forming Technology IWU, 2023)In high strain rate forming processes two superposing and opposing effects influence the flow stress of the material: strain rate hardening and thermal softening due to adiabatic heating. The presented FE-model and ... -
Forming and cutting at high strain rates Part 1: Experimental data and FE-model for an inverse material characterization of DC06 at high strain rates
(Technische Universität DresdenFraunhofer Institute for Machine Tools and Forming Technology IWU, 2023)High-speed processes can lead to significant technological advantages like an increased formability, reduced springback or an improved quality of cutting edges. For conventional forming processes, quasi-static conditions ...