Time-Dependent Method for the Inverse Evaluation of Yield Locus Using Nakazima Experiments
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Date
2022
Publication Type
Conference Paper
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yes
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Abstract
The position of the plane strain (PS) point in the stress space depends on the choice of the yield locus. Using non-quadratic yield loci the curvature and therefore the location of PS are determined by the yield locus exponent. On the contrary, the Vegter yield locus offers the opportunity to define exactly the position of PS. Currently, to use this freedom cost-expensive experiments have to be conducted or the position is roughly approximated. In this work, a new method is described to determine the two stress components of the plane strain point for the aluminum alloy AA6016-T4. The time-dependent strain distributions of Nakazima experiments recorded by an optical measurement system are used to conduct a reverse fitting of the PS point. Different strategies of determining the PS point using this new method are compared.
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published
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Book title
NUMISHEET 2022: Proceedings of the 12th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes
Journal / series
Volume
Pages / Article No.
275 - 284
Publisher
Springer
Event
12th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes (Numisheet 2022)
Edition / version
Methods
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Subject
Plane strain; Yield locus; Strain distribution; Nakazima experiments; aluminum alloy; Vegter yield locus; DIC; Inverse fitting; Time dependent
Organisational unit
09706 - Bambach, Markus / Bambach, Markus