ETME360Spring Semester 2014
Ultrasonic non-destructive testing (NDT) techniques are used
to evaluate material properties of an unknown metal
of density ρ = 0.29 lb/in³
. Longitudinal sound velocity for the 10 MHz signal is
X 105 inches/sec, and shear (transverse) velocity
is measured at 1.19
x 105 inches/sec.
Find Poisson’s ratio, Young’s Modulus, and Shear
modulus for the sample based on these test results.
2. Bonus! The sample is non-radioactive, legally obtained - but costly. It has a silvery appearance, and seems to be non-reactive. The specimen will not melt in the lab's best heat treatment oven, even at the highest settings. (Oven is capable of reaching temperatures of around 1250°C.) The sample has proven difficult to machine, evidently due to work hardening; the material tends to plastically deform on the second pass of a cutter.
Perform any research necessary to identify this metal alloy sample based on the information provided and comparisons of density and calculated Young’s Modulus to published values. Cite the source of comparison data using proper citation methodology.