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Feb25-12, 05:45 PM
P: 105
Why do tensile testing graphs show a negative slope at these regions?

It's an issue of lateral contraction and whether or not it is being considered.

As OldEngr63 states, engineering stress vs. strain is just a scaled version of force vs. deformation. Either way, you'd get a plot that looks like the one the TS posted.

As I said before, however, true stress vs. strain would NOT look like the plot that the TS posted.