The stress-strain diagram for many metal alloys can be described analytically using the Ramberg-Osgood three parameter equation ε= σ/E + koⁿ, where E, k, and n are determined from measurements taken from the diagram. Using the stress-strain diagram shown in the figure, take E= 30(10³) ksi and determine the other two parameters k and n and thereby obtain an analytical expression for the curve.

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(ksi) 80 60 60 40 20 20 0.1 0.2 0.3 0.4 0.5 (10-6)