TY - GEN
T1 - A Robust Method to Determine True Stress–true Strain Curves for Sheet Metals at High Temperatures
AU - Zhang, Ruiqiang
AU - Chen, Siyi
AU - Lin, Jianguo
N1 - Publisher Copyright:
© 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.
PY - 2024/8
Y1 - 2024/8
N2 - Thermo-mechanical uniaxial tensile tests on sheet metals have been widely carried out to characterize the mechanical behavior of the materials at high temperatures. Because of nonuniform temperature along gauge length, however, nonuniform deformation occurs from the beginning of deformation, leading to challenges to determine stress–strain curves. In the present study, a robust method for determining true stress–true strain curves has been proposed; in this method, true strains are obtained within a local area in which fracture occurs, and true stresses are computed based on the engineering strains within this local area. Uniaxial tensile tests on aluminum alloy AA6082 sheets under hot stamping conditions have been carried out, with the strain measurement using the digital image correlation (DIC) technique. The onset of necking in those tests has been determined using the spatio-temporal method. Then the data before the necking have been analyzed and the robust method has been applied to determine the associated true stress–true strain curves. The true stresses computed using the robust method have also been benchmarked against those computed using the standard method. It concludes that this robust method is able to accurately determine the true stress–true strain curves at high temperatures.
AB - Thermo-mechanical uniaxial tensile tests on sheet metals have been widely carried out to characterize the mechanical behavior of the materials at high temperatures. Because of nonuniform temperature along gauge length, however, nonuniform deformation occurs from the beginning of deformation, leading to challenges to determine stress–strain curves. In the present study, a robust method for determining true stress–true strain curves has been proposed; in this method, true strains are obtained within a local area in which fracture occurs, and true stresses are computed based on the engineering strains within this local area. Uniaxial tensile tests on aluminum alloy AA6082 sheets under hot stamping conditions have been carried out, with the strain measurement using the digital image correlation (DIC) technique. The onset of necking in those tests has been determined using the spatio-temporal method. Then the data before the necking have been analyzed and the robust method has been applied to determine the associated true stress–true strain curves. The true stresses computed using the robust method have also been benchmarked against those computed using the standard method. It concludes that this robust method is able to accurately determine the true stress–true strain curves at high temperatures.
KW - Hot stamping
KW - Necking
KW - Temperature nonuniformity
KW - True stress–true strain curve
KW - Uniaxial tensile test
UR - http://www.scopus.com/inward/record.url?scp=85173580775&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-40920-2_54
DO - 10.1007/978-3-031-40920-2_54
M3 - Conference article published in proceeding or book
AN - SCOPUS:85173580775
SN - 9783031409196
T3 - Lecture Notes in Mechanical Engineering
SP - 525
EP - 532
BT - Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity - ICTP 2023 - Volume 2
A2 - Mocellin, Katia
A2 - Bouchard, Pierre-Olivier
A2 - Bigot, Régis
A2 - Balan, Tudor
PB - Springer Science and Business Media Deutschland GmbH
T2 - 14th International Conference on Technology of Plasticity, ICTP 2023
Y2 - 24 September 2023 through 29 September 2023
ER -