Astainless-steel specimen from the same material characterized up above, was formed into a rectangular cross-section of dimensions (3/4 in. x 1/8 in). the specimen is subject to a tensile force of 72,000 n.

(a) determine the elastic and plastic strain values when the specimen is subject to the 72,000 n tensile load.
(b) if the original length is 24 in., what will be its final length after the 72,000 n tensile load is released

Our dates are in different Units, we will do a unique system. I will use International System Units.

F=72000N

We can now calculate the stress with the force applied, that is

A) The elastic straint is given by,

Where E is the Elastic coefficient. This coefficient for Steel is 201Gpa or

We know for the tables of Strain Steel that the Total Strain is

Then the Plastic Strain is given by,

B) Now with the original length of 24in, i.e 609,6mm we have that

Therefore the final length after the 72000N will be 612.2176mm

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explanation: