Asquare steel bar has a length of 7.4 ft and a 2.9 in by 2.9 in cross section and is subjected to axial tension. the final length is 7.40504 ft . the final side length is 2.89945 in . what is poisson's ratio for the material?

Poission Ratio = 0.2784

Step-by-step explanation:

we know that

Poission ratio is defined as

μ =

We also know that lateral strain =

In our case

Final width = 2.89945 in

Initial width = 2.9 in (Area of cross section (width x depth) = 2.9 in x 2.9 in)

Thus  lateral strain =

Lateral strain =  

Similarly longitudinal strain =

Thus  longitudinal strain =

Longitudinal strain =  

Thus by formula poission ratio =  

Poission Ratio = 0.2784

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490