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Unformatted text preview: stic strain ends and plastic strain begins.
Yield strength is chosen to be that strength at
which a definite amount of plastic deformation
e.g. - 0.2 percent plastic strain STEPS IN CONSTRUCTING 0.2% YIELD STRENGTH
1. Draw a line parallel to the
elastic (linear) part of the
stress-strain curve at 0.002
2. At the point where the line
intersects the stress-strain
curve, a horizontal line is
drawn to the stress axis.
3. The 0.2 % offset yield
strength corresponds to this
stress. Representative Stress-Strain Curves
for Various Engineering Materials ULTIMATE TENSILE STRENGTH
The UTS is the maximum strength
reached in the engineering stress-strain
Increased strain beyond the strain at
which the UTS occurs causes necking.
Necking occurs when the specimen
develops a localized...
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- Fall '13