Question

Assume that you are a technical engineer of a materials testing lab, and received a report on bi-axial test on a thin stainless steel plate as shown in the figure. The test results indicates that the strains measured in the plate are ε_y = 488 µε and ε_x = 654 µε. You recall that the Poisson's ratio is v=ε_lat/ε_long. Assuming ε_x = ε_long and ε_y = ε_lat , one would get v=0.75. Given this information, answer the following questions in details.

1) Is the calculated Poisson's ratio correct? Explain why?

2) Are test results valid? Do you need to redo the test or redo the calculation?

3) Assuming that repeating the test would give the similar results, what value would you report as the Poisson's ratio?

Answer 1