Abstract
Constitutive equations for the multiaxial stress-strain behavior of aluminum alloy 5754 sheets were developed, based on crystal plasticity. A Taylor-based polycrystal plasticity model, a tangent formulation of the self-consistent viscoplastic model (VPSC), and an N-site viscoplastic model based on the fast Fourier transform (VPFFT) were used to fit a single slip system hardening law to the available data for tension, plane strain, and biaxial stretching. The fitting procedure yields good agreement with the monotonic stress-strain data, with similar parameter values for each model. When simulating multiaxial tests using the developed hardening law, models that allow both stress and strain variations in grains give better predictions of the stress-strain curves. Furthermore, generally, the simulated texture evolution is too rapid when compared to the experiments. By incorporating a more detailed neighbor interaction effect, the VPFFT model predicts texture evolution in better agreement with experiments.
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Acknowledgments
This work was supported at Carnegie Mellon University by the National Institute of Standards & Technology under Award No. 70NANB8H8038. Use of facilities provided by the Higher Education Program, Intel Corporation, and by the MRSEC, CMU, under NSF Grant No. DMR-0520425 is also gratefully acknowledged. Use of the VPFFT code from Ricardo Lebensohn, Los Alamos National Laboratory, is gratefully acknowledged.
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Manuscript submitted July 15, 2010.
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Hu, L., Rollett, A.D., Iadicola, M. et al. Constitutive Relations for AA 5754 Based on Crystal Plasticity. Metall Mater Trans A 43, 854–869 (2012). https://doi.org/10.1007/s11661-011-0927-1
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DOI: https://doi.org/10.1007/s11661-011-0927-1