Strain path change effects in the local necking of aluminum sheet and in the tension of internally pressurized tubes |
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Authors: | P S Bate |
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Affiliation: | (1) IRC in Materials for High Performance Applications, The University of Birmingham, B15 2TT Birmingham, UK |
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Abstract: | It is possible to increase significantly the uniform elongation achieved in the uniaxial tension of commercial purity aluminum
by accelerating the testing rate. This effect is linked to a significant rate sensitivity of strain hardening. However, very
little increase in the strains associated with the final stages of localization in sheet specimens were achieved by this means.
The importance of the change in strain rate and path on local necking has been investigated by introducing path changes of
appropriate magnitudes in tubular tensile specimens by internal pressurization. The path change led to a decrease in strain-hardening
rate which was not compensated for by an increase in strain rate. The potential consequences of this effect upon ductility
in sheets are significant and limit the potential usefulness of any rate sensitivity of strain hardening in increasing formability. |
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