Title: New biaxial yield function for aluminum alloys based on plastic work and work-hardening analyses
Authors: Saimoto, S. ×
Van Houtte, Paul
Inal, K.
Langille, M.R. #
Issue Date: 2016
Publisher: Elsevier Science
Series Title: Acta Materialia vol:118 pages:109-119
Abstract: Yield locus measurements and their analytical descriptions has been the bases for modeling metal processing. These analytical descriptions play a role in models to predict limit strains observed during determination of forming limit diagrams of flat metal stock as means to evaluate their fabrication performance. Some of these analytical descriptions use the isotropic or anisotropic plastic potentials that take into account the crystallographic texture of the material. The applicability of such potentials is validated by comparing their predictions to that of unidirectional tensile data. In the current work, this approach is reversed to examine whether the constitutive relations, which replicate the measured stress strain diagrams, can generate a two-dimensional section of the yield locus. The strategy is to sum the computed plastic work (PW) from unidirectional mechanical tests in two principal directions which also accommodates the biaxial interaction strains. The resulting yield function includes fq and f4, the prescribed stress ratios and the texture parameters R4 and Rq in their respective principal directions. The prescribed PW at an arbitrary strain during unidirectional tensile test is equated to the work sum from
the biaxial stresses on the premise that the plastic flow-stress registers only the increasing density of obstacles it generates. The computed biaxial yield stresses showed good fits for AA5154 and AA5754 with only small modification due to latent work hardening.
ISSN: 1359-6454
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Structural Composites and Alloys, Integrity and Nondestructive Testing
× corresponding author
# (joint) last author

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