Two damage indicators for ductile failure, as proposed by Hancock–Mackenzie–Gunawardena and Atkins, are compared with experimental results from literature for the upsetting process of cylindrical specimens. It is shown, for this specific example, that quite similar results can be obtained from highly different damage indicators as long as they allow for the accumulation of damage proportional both to the equivalent strain and to the stress triaxiality; the specific mathematical structure of the indicator seems to be of minor importance. These findings give some guidelines for the practical choice of a damage indicator for the simulation of industrial forming processes, and suggest the use of the void growth based Hancock–Mackenzie–Gunawardena indicator even for a certain class of bulk forming processes. In addition, a slight geometry dependence of the failure lines obtained by the Hancock–Mackenzie–Gunawardena indicator is obtained that has so far neither been reported by experimentalists, nor can it be reproduced in a comparable manner by the Atkins indicator. A surprising correlation is found between these results and those obtained from an entirely different micromechanical analysis proposed recently by one of the authors.
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January 2001
Technical Papers
Upsetting of Cylinders: A Comparison of Two Different Damage Indicators
H.-P. Ga¨nser,
H.-P. Ga¨nser
Institute of Mechanics, Montanuniversita¨t Leoben, Leoben, Austria
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A. G. Atkins,
A. G. Atkins
University of Reading, Reading, United Kingdom
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O. Kolednik,
O. Kolednik
Erich Schmid Institute of Materials Science, Austrian Academy of Science, and Institute of Metal Physics, Montanuniversita¨t Leoben, Leoben, Austria
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F. D. Fischer,
F. D. Fischer
Christian Doppler Laboratory for Micromechanics of Materials, Institute of Mechanics, Montanuniversita¨t Leoben, Leoben, Austria
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O. Richard
O. Richard
Institut Franc¸ais de Me´canique Avance´e, Aubie`re, France
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H.-P. Ga¨nser
Institute of Mechanics, Montanuniversita¨t Leoben, Leoben, Austria
A. G. Atkins
University of Reading, Reading, United Kingdom
O. Kolednik
Erich Schmid Institute of Materials Science, Austrian Academy of Science, and Institute of Metal Physics, Montanuniversita¨t Leoben, Leoben, Austria
F. D. Fischer
Christian Doppler Laboratory for Micromechanics of Materials, Institute of Mechanics, Montanuniversita¨t Leoben, Leoben, Austria
O. Richard
Institut Franc¸ais de Me´canique Avance´e, Aubie`re, France
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division May 25, 1999; revised manuscript received February 15, 2000. Associate Technical Editor: E. P. Busso.
J. Eng. Mater. Technol. Jan 2001, 123(1): 94-99 (6 pages)
Published Online: February 15, 2000
Article history
Received:
May 25, 1999
Revised:
February 15, 2000
Citation
Ga¨nser, H., Atkins, A. G., Kolednik, O., Fischer, F. D., and Richard, O. (February 15, 2000). "Upsetting of Cylinders: A Comparison of Two Different Damage Indicators ." ASME. J. Eng. Mater. Technol. January 2001; 123(1): 94–99. https://doi.org/10.1115/1.1286186
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