Influence of Punch Radius in a Nakazima Test for Mild Steel and Aluminium

E. Fictorie, Antonius H. van den Boogaard, E.H. Atzema, E.H. Atzema

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)

Abstract

Forming limit curves are usually determined for membrane type deformations. Recently, the influence of simultaneous bending deformation on the forming limits has attracted renewed attention. In this paper, FLCs are determined for a DC06 steel and an AA5051 aluminium alloy by the standard Nakazima test procedure with different punch diameters. The difference in FLC obtained with punch diameters of 100 mm and 75 mm is negligible. For aluminium, the FLC is shifted upwards slightly for a Ø50 mm punch and significantly for a Ø20 mm punch. For DC06, only the experiments with a Ø20 mm punch show a relevant increase in formability. The increased formability cannot be explained by simply transforming the measured (outer) strains to the mid-plane or inner-plane, as proposed by the so-called concave-side-rule. The experimentally observed and numerically validated high pressure on the inner surface for small punch diameters may be responsible for the increased stability of the deformation.
Original languageUndefined
Pages (from-to)1179-1182
Number of pages4
JournalInternational journal of material forming
Volume3
Issue numbersupplement 1
DOIs
Publication statusPublished - 2010

Keywords

  • METIS-266992
  • Formability - stretching - bending radius - curvature - Nakazima test
  • IR-71869

Cite this

Fictorie, E. ; van den Boogaard, Antonius H. ; Atzema, E.H. ; Atzema, E.H. / Influence of Punch Radius in a Nakazima Test for Mild Steel and Aluminium. In: International journal of material forming. 2010 ; Vol. 3, No. supplement 1. pp. 1179-1182.
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abstract = "Forming limit curves are usually determined for membrane type deformations. Recently, the influence of simultaneous bending deformation on the forming limits has attracted renewed attention. In this paper, FLCs are determined for a DC06 steel and an AA5051 aluminium alloy by the standard Nakazima test procedure with different punch diameters. The difference in FLC obtained with punch diameters of 100 mm and 75 mm is negligible. For aluminium, the FLC is shifted upwards slightly for a {\O}50 mm punch and significantly for a {\O}20 mm punch. For DC06, only the experiments with a {\O}20 mm punch show a relevant increase in formability. The increased formability cannot be explained by simply transforming the measured (outer) strains to the mid-plane or inner-plane, as proposed by the so-called concave-side-rule. The experimentally observed and numerically validated high pressure on the inner surface for small punch diameters may be responsible for the increased stability of the deformation.",
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author = "E. Fictorie and {van den Boogaard}, {Antonius H.} and E.H. Atzema and E.H. Atzema",
note = "Proceedings of the 13th ESAFORM Conference on Material Forming, Brescia (Italy), 7–9 April 2010 (edited by Elisabetta Ceretti, University of Brescia, and Claudio Giardini, University of Bergamo)",
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Influence of Punch Radius in a Nakazima Test for Mild Steel and Aluminium. / Fictorie, E.; van den Boogaard, Antonius H.; Atzema, E.H.; Atzema, E.H.

In: International journal of material forming, Vol. 3, No. supplement 1, 2010, p. 1179-1182.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Influence of Punch Radius in a Nakazima Test for Mild Steel and Aluminium

AU - Fictorie, E.

AU - van den Boogaard, Antonius H.

AU - Atzema, E.H.

AU - Atzema, E.H.

N1 - Proceedings of the 13th ESAFORM Conference on Material Forming, Brescia (Italy), 7–9 April 2010 (edited by Elisabetta Ceretti, University of Brescia, and Claudio Giardini, University of Bergamo)

PY - 2010

Y1 - 2010

N2 - Forming limit curves are usually determined for membrane type deformations. Recently, the influence of simultaneous bending deformation on the forming limits has attracted renewed attention. In this paper, FLCs are determined for a DC06 steel and an AA5051 aluminium alloy by the standard Nakazima test procedure with different punch diameters. The difference in FLC obtained with punch diameters of 100 mm and 75 mm is negligible. For aluminium, the FLC is shifted upwards slightly for a Ø50 mm punch and significantly for a Ø20 mm punch. For DC06, only the experiments with a Ø20 mm punch show a relevant increase in formability. The increased formability cannot be explained by simply transforming the measured (outer) strains to the mid-plane or inner-plane, as proposed by the so-called concave-side-rule. The experimentally observed and numerically validated high pressure on the inner surface for small punch diameters may be responsible for the increased stability of the deformation.

AB - Forming limit curves are usually determined for membrane type deformations. Recently, the influence of simultaneous bending deformation on the forming limits has attracted renewed attention. In this paper, FLCs are determined for a DC06 steel and an AA5051 aluminium alloy by the standard Nakazima test procedure with different punch diameters. The difference in FLC obtained with punch diameters of 100 mm and 75 mm is negligible. For aluminium, the FLC is shifted upwards slightly for a Ø50 mm punch and significantly for a Ø20 mm punch. For DC06, only the experiments with a Ø20 mm punch show a relevant increase in formability. The increased formability cannot be explained by simply transforming the measured (outer) strains to the mid-plane or inner-plane, as proposed by the so-called concave-side-rule. The experimentally observed and numerically validated high pressure on the inner surface for small punch diameters may be responsible for the increased stability of the deformation.

KW - METIS-266992

KW - Formability - stretching - bending radius - curvature - Nakazima test

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EP - 1182

JO - International journal of material forming

JF - International journal of material forming

SN - 1960-6206

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