INVESTIGADORES
SIGNORELLI Javier Walter
artículos
Título:
Experimental and numerical study of the role of crystallographic texture on the formability of an electro-galvanized steel shee
Autor/es:
J.W. SIGNORELLI; M.J. SERENELLI; M.A. BERTINETTI
Revista:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 212 p. 1367 - 1376
ISSN:
0924-0136
Resumen:
In this work, the influence of plastic anisotropy on forming-limit strains for a drawing-quality steel sheet
was investigated. For this purpose, hourglass-type samples, taken at 0◦, 45◦ and 90◦ with respect to the
sheet rolling direction were tested with a typical punch and die fixturing. Numerical simulations were
carried out in order to validate two viscoplastic (VP) polycrystalline models, self-consistent (SC) and fullconstraint
Taylor-type (FC), in conjunction with the Marciniak and Kuczynski (MK) localization approach.
The observed shift to the right in the minimum of the forming limit diagram (FLD), inherent to Nakazima
test, was taken into account in the simulations. Keeping the set of adjustable parameters to a minimum
in the calibration of the viscoplastic polycrystal model, only the materials initial texture and a power
law fit to the tensile data needed to be measured. Without other adjustments to either model, MK-VPSC
gives realistic predictions over the entire FLD, while the MK-FC predictions only follow the measured
limit curve on the tensile side of plane strain. In the positive biaxial quadrant of the FLD, MK-FC predicts
unrealistic high limit values. It was found that, despite these extremely high limit values, the similarity
in the measured limit strains for the three sample orientations is captured by both models. However, a
consistency in the MK-VPSC predictions indicates that this model seems to be a more suitable tool for
describing the role of crystallographic texture on the sheet metal forming processes.
sheet rolling direction were tested with a typical punch and die fixturing. Numerical simulations were
carried out in order to validate two viscoplastic (VP) polycrystalline models, self-consistent (SC) and fullconstraint
Taylor-type (FC), in conjunction with the Marciniak and Kuczynski (MK) localization approach.
The observed shift to the right in the minimum of the forming limit diagram (FLD), inherent to Nakazima
test, was taken into account in the simulations. Keeping the set of adjustable parameters to a minimum
in the calibration of the viscoplastic polycrystal model, only the materials initial texture and a power
law fit to the tensile data needed to be measured. Without other adjustments to either model, MK-VPSC
gives realistic predictions over the entire FLD, while the MK-FC predictions only follow the measured
limit curve on the tensile side of plane strain. In the positive biaxial quadrant of the FLD, MK-FC predicts
unrealistic high limit values. It was found that, despite these extremely high limit values, the similarity
in the measured limit strains for the three sample orientations is captured by both models. However, a
consistency in the MK-VPSC predictions indicates that this model seems to be a more suitable tool for
describing the role of crystallographic texture on the sheet metal forming processes.
sheet rolling direction were tested with a typical punch and die fixturing. Numerical simulations were
carried out in order to validate two viscoplastic (VP) polycrystalline models, self-consistent (SC) and fullconstraint
Taylor-type (FC), in conjunction with the Marciniak and Kuczynski (MK) localization approach.
The observed shift to the right in the minimum of the forming limit diagram (FLD), inherent to Nakazima
test, was taken into account in the simulations. Keeping the set of adjustable parameters to a minimum
in the calibration of the viscoplastic polycrystal model, only the materials initial texture and a power
law fit to the tensile data needed to be measured. Without other adjustments to either model, MK-VPSC
gives realistic predictions over the entire FLD, while the MK-FC predictions only follow the measured
limit curve on the tensile side of plane strain. In the positive biaxial quadrant of the FLD, MK-FC predicts
unrealistic high limit values. It was found that, despite these extremely high limit values, the similarity
in the measured limit strains for the three sample orientations is captured by both models. However, a
consistency in the MK-VPSC predictions indicates that this model seems to be a more suitable tool for
describing the role of crystallographic texture on the sheet metal forming processes.
◦, 45◦ and 90◦ with respect to the
sheet rolling direction were tested with a typical punch and die fixturing. Numerical simulations were
carried out in order to validate two viscoplastic (VP) polycrystalline models, self-consistent (SC) and fullconstraint
Taylor-type (FC), in conjunction with the Marciniak and Kuczynski (MK) localization approach.
The observed shift to the right in the minimum of the forming limit diagram (FLD), inherent to Nakazima
test, was taken into account in the simulations. Keeping the set of adjustable parameters to a minimum
in the calibration of the viscoplastic polycrystal model, only the materials initial texture and a power
law fit to the tensile data needed to be measured. Without other adjustments to either model, MK-VPSC
gives realistic predictions over the entire FLD, while the MK-FC predictions only follow the measured
limit curve on the tensile side of plane strain. In the positive biaxial quadrant of the FLD, MK-FC predicts
unrealistic high limit values. It was found that, despite these extremely high limit values, the similarity
in the measured limit strains for the three sample orientations is captured by both models. However, a
consistency in the MK-VPSC predictions indicates that this model seems to be a more suitable tool for
describing the role of crystallographic texture on the sheet metal forming processes.