In the WIT text, UTS = highest stress [Stress(max)] on the stress-strain curve (before necking).
However, in the WIT formula sheet, UTS = Stress(max)\Area, where Stress(max) = load to break the sample.
Highest stress on the stress-strain curve does not equal the load to break the sample (stress-strain curve endpoint).
So which is to be used ?
Stress(max) = highest stress on stress-strain plot
or
Stress(max) = stress at sample fracture ? [API 1104 uses fracture stress].
Load to break the sample = fracture stress.
Ultimate Tensile Strength is not the same as fracture stress.
What I think is correct is UTS = Stress(max)\Area since it is a stress limit state.
The "Stress(max) = load to break sample" is an error since load to break sample = fracture stress.
On the web I am finding different interchangeably used terminology (TS\UTS) so it is unclear.
From my understanding:
Tensile Strength = fracture stress\area and Ultimate Tensile Strength = Stress(max) from stress-strain curve\area.
Is this correct ?
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This is just one of many errors in the AWS study texts. Someone studies using AWS texts and they fail the exam because of the errors...