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Crystallography-based prediction of plastic anisotropy of polycrystalline materials

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Abstract

The on-line prediction of metal sheet formability requires that both material characterization (texture identification) and yield loci predetermination be done in very shor time intervals. Of two applicable approaches, i.e., continuum mechanics and crystallography-based methods, only the latter are suitable for this purpose. Several models of plasticity of a polycrystalline material were reviewed, and their applicability to the prediction of plastic anisotropy of face-centered cubic (FCC) metals was evaluated. A tailored set of cold-rolled copper alloy samples was designed and manufactured, representing the wide spectrum of textures and cold work levels typical for the sheet metal industry. The texture was quantitatively described in the form of the orientation distribution functions derived by the inversion of four incomplete pole figures. The Taylor-Bishop-Hill model was applied in order to calculate the planar variation of the plastic strain ratio. The continuum mechanics of textured polycrystals approach was also used for the prediction of the plastic strain-rate ratio for the same set of deformed materials. The theoretical predictions were compared with the plastic strain ratios measured in tensile tests using strain gauges. The applicability of the models for prediction of the plastic anisotropy of FCC metals was discussed in view of the operating deformation mechanisms and other factors such as strain hardening sensitivity and grain size/shape effects.

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Authors and Affiliations

  1. The Pennsylvania State University, 16802, University Park, Pennsylvania

    K. J. Kozaczek, C. O. Ruud & J. C. Conway Jr.

  2. VAW Aluminum, Bonn, Germany

    J. Hirsch

  3. Concurrent Technologies Corp., 15909, Johnstown, Pennsylvania

    C. J. Yu

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  1. K. J. Kozaczek
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  2. C. O. Ruud
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  3. J. Hirsch
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  4. J. C. Conway Jr.
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  5. C. J. Yu
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Kozaczek, K.J., Ruud, C.O., Hirsch, J. et al. Crystallography-based prediction of plastic anisotropy of polycrystalline materials. J Nondestruct Eval 12, 97–107 (1993). https://doi.org/10.1007/BF00565912

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