TY - GEN
T1 - Thermomechanical Analysis and Experimental Validation of ECAP for Aluminum Sheet Metal
AU - Gruber, Maximilian
AU - Yang, Yiheng
AU - Illgen, Christian
AU - Frint, Philipp
AU - Wagner, Martin F.X.
AU - Volk, Wolfram
N1 - Publisher Copyright:
© 2021, The Minerals, Metals & Materials Society.
PY - 2021
Y1 - 2021
N2 - Equal-channel angular pressing (ECAP) is an established method for the improvement of mechanical properties by grain refinement through shear strains. While there is a profound knowledge about ECAP of bulk materials, there is only a little information on the effect of ECAP on sheet metals. Therefore, a tool was developed that is able to perform ECAP tests for metals with a thickness of 1.8 mm. In this contribution, a thermomechanical simulation model is used to examine the novel process. The simulation is performed to investigate the dissipated forming heat and the heat due to friction. To validate the numerical results, experiments with the ECAP tool for sheet metal are performed. By drilling holes in the sheet material, the forming temperature can be measured with thermocouples and friction parameters used in the simulation can be calibrated inversely. Since a detailed material model is essential for the inverse determination of individual parameters, a special focus of this article is on the determination of the thermomechanical parameters. For example, the plastic flow behavior or thermomechanical conversion, expressed as the Taylor–Quinney coefficient, is examined under a stress state similar to ECAP by means of a Miyauchi test. In this way, fundamental correlations between the heat development in the ECAP process for aluminum sheet metal and the shear strain introduced into the material can be obtained.
AB - Equal-channel angular pressing (ECAP) is an established method for the improvement of mechanical properties by grain refinement through shear strains. While there is a profound knowledge about ECAP of bulk materials, there is only a little information on the effect of ECAP on sheet metals. Therefore, a tool was developed that is able to perform ECAP tests for metals with a thickness of 1.8 mm. In this contribution, a thermomechanical simulation model is used to examine the novel process. The simulation is performed to investigate the dissipated forming heat and the heat due to friction. To validate the numerical results, experiments with the ECAP tool for sheet metal are performed. By drilling holes in the sheet material, the forming temperature can be measured with thermocouples and friction parameters used in the simulation can be calibrated inversely. Since a detailed material model is essential for the inverse determination of individual parameters, a special focus of this article is on the determination of the thermomechanical parameters. For example, the plastic flow behavior or thermomechanical conversion, expressed as the Taylor–Quinney coefficient, is examined under a stress state similar to ECAP by means of a Miyauchi test. In this way, fundamental correlations between the heat development in the ECAP process for aluminum sheet metal and the shear strain introduced into the material can be obtained.
KW - Aluminum AA5083
KW - Equal-Channel Angular Pressing (ECAP)
KW - Miyauchi test
KW - Taylor–Quinney coefficient
KW - Thermomechanical analysis
UR - http://www.scopus.com/inward/record.url?scp=85112501572&partnerID=8YFLogxK
U2 - 10.1007/978-3-030-75381-8_149
DO - 10.1007/978-3-030-75381-8_149
M3 - Conference contribution
AN - SCOPUS:85112501572
SN - 9783030753801
T3 - Minerals, Metals and Materials Series
SP - 1775
EP - 1790
BT - Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity
A2 - Daehn, Glenn
A2 - Cao, Jian
A2 - Kinsey, Brad
A2 - Tekkaya, Erman
A2 - Vivek, Anupam
A2 - Yoshida, Yoshinori
PB - Springer Science and Business Media Deutschland GmbH
T2 - 13th International Conference on the Technology of Plasticity, ICTP 2021
Y2 - 25 July 2021 through 30 July 2021
ER -