Plastic behavior of 70/30 brass sheet |
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Authors: | R H Wagoner |
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Affiliation: | (1) Physics Department, General Motors Research Laboratories, 48090-9055 Warren, MI |
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Abstract: | The plastic yield behavior of strip annealed 70/30 brass sheet has been investigated using several experimental techniques.
Proportional path, stress-strain relations were measured in two strain states using a recently devised plane-strain test and
a standard sheet tensile test. Based on these data, 70/30 brass exhibits a dramatic departure from Hill's plasticity models.
Particularly notable is the lower work-hardening rate in plane strain. A second series of tests was carried out by deforming
first in plane-strain tension and subsequently in uniaxial tension. The relative orientation of the principal strain directions
in the two strain paths strongly affected the transient yielding behavior, but the original work-hardening pattern and plastic
anisotropy were approached after an additional effective strain of ∼0.04. These observations are consistent with a two yield-surface
model;i.e., one an underlying, proportional path yield surface and one an instantaneous, transient yield surface. |
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