کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
782324 1464993 2014 18 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of the cube orientation on formability for FCC materials: A detailed comparison between full-constraint and self-consistent predictions
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Effect of the cube orientation on formability for FCC materials: A detailed comparison between full-constraint and self-consistent predictions
چکیده انگلیسی


• FCC sheet metals with Cube, R-Cube and ND-Cube type material textures are modeled.
• Forming-limit values are modeled using crystal plasticity models (MK-FC and MK-VPSC).
• Results for R-Cube and ND-Cube in plane-strain are related to geometrical hardening.
• MK-VPSC results in balanced-biaxial mode are affected by geometrical softening.
• An extension of MK to explicitly include stress loading conditions is proposed.

A rate-dependent self-consistent (VPSC) polycrystal-plasticity model, in conjunction with the MK approach, has been used successfully to address and explain plastic deformation features and localization conditions that cannot be treated with the full-constraint (FC) Taylor scheme. Signorelli and Bertinetti [On the role of constitutive model in the forming limit of FCC sheet metal with cube orientations, International Journal of Mechanical Sciences, 51: 473–480, 2009] investigated FCC sheet-metal formability, focusing on how the cube texture affects localized necking. In the present work, we extent this research to include two types of textures experimentally observed in aluminum alloys: the {100} 〈001〉 Cube orientation rotated 45° with respect to the sheet normal direction; and the {100} 〈uvw〉 orientations. The effect of these orientations on the FLD is studied numerically, and a detailed comparison between MK-FC and MK-VPSC, derived from orientation stability and geometrical hardening, is made. The classical MK model, based on strain-rate imposed boundary conditions, was generalized in order to explicitly and correctly includes stress boundary conditions for materials with changes in anisotropy during deformation. In plane-strain stretching, the enhanced formability of the rotated 45° {100} 〈001〉 orientations has been correlated with texture evolution. In equi-biaxial stretching, the MK-FC approach predicted greater limit-strain values than did the MK-VPSC model. Qualitative differences in geometrical hardening/softening were also found.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Mechanical Sciences - Volume 87, October 2014, Pages 200–217
نویسندگان
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