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Fluctuation-Induced Nucleation of PLC Bands

Published online by Cambridge University Press:  21 March 2011

P. Sapalidis ,
D. Dodou ,
P. Hähner ,
M. Zaiser  and
E.C. Aifan tis
P. Sapalidis
Affiliation:
Aristotle Univ ersity of Thessaloniki, Polytechnic School, 54006 Thessaloniki, Greece
D. Dodou
Affiliation:
Aristotle Univ ersity of Thessaloniki, Polytechnic School, 54006 Thessaloniki, Greece
P. Hähner
Affiliation:
European Commission, JR C-IAM, P.O. Box 2, NL-1755ZG Petten, The Netherlands
M. Zaiser
Affiliation:
Max-Planc k-Institut für Metallforsc hung, Heisenbergstr. 1, D-70569 Stuttgart, German y
E.C. Aifan tis
Affiliation:
Aristotle Univ ersity of Thessaloniki, Polytechnic School, 54006 Thessaloniki, Greece Center for the Mec hanics of Materials and Instabilities, Mic higan Technological University, Houghton, MI 49931
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Abstract

The inuence of mesoscopic strain-rate uctuations on the n ucleation of localized deformation bands (PLC bands) in dynamically strain ageing materials is discussed. It is shown that uctuations ma y lead to a macroscopic localization of plastic ow even if linear stability analysis (LSA) of the macroscopic constitutiv e equations predicts stable deformation beha vior. The resulting quantitative corrections to linear stability analysis are evaluated, and implications for the reliabilit y of LSA results are discussed.

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References

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