What is the permanent set of the bar

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A round bar having a length of 1.2 m and a diameter of 6 mm is made of an aluminum alloy for which the stressstrain diagram can be described mathematically by the following equation:

in which σ has units of megapascals (MPa). The shape of this stress-strain diagram is shown in the figure. The bar is axially loaded by tensile forces P = 12.5 kN, after which the loads are removed. What is the permanent set of the bar?

Reference no: EM131170955

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