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Characterizing and Modeling Plastic Strain Inhomogeneity in Thin Metallic Sheets

Published online by Cambridge University Press:  10 February 2011

X. Li  and
W. Tong
X. Li
Affiliation:
Department of Mechanical Engineering, Yale University, New Haven, CT 06520-8284, wei.tong@yale.edu
W. Tong
Affiliation:
Department of Mechanical Engineering, Yale University, New Haven, CT 06520-8284, wei.tong@yale.edu
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Abstract

Using a newly developed plastic strain measurement technique based on digital image correlation, surface plastic deformation of polycrystalline aluminum alloys in a thin sheet form has been experimentally characterized at a length scale comparable to that of the thickness of the aluminum sheets but much larger than the average size of individual grains. Both static and dynamic local straining patterns in these aluminum alloys have been observed and these strain patterns can not be simulated using the conventional plasticity models. The texture clustering of grains may contribute to the static local plastic strain patterns detected in an Al-Mg alloy. Two distinctive dynamic straining behaviors resulted from the dynamic strain aging of dislocations due to the alloying elements have been experimentally established for 5XXX and 6XXX alloys, respectively. First observation of dynamic strain inhomogeneity is also made in a sheet metal specimen deforming predominately in a plane strain state.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 538: Symposium J – Multiscale Modelling of Materials , 1998 , 179
Copyright
Copyright © Materials Research Society 1999

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