Effect of grain size distribution on the acoustic nonlinearity parameter

What is it about?

Other than the mean grain size, its distribution also play an important role in the measured acoustic nonlinearity parameter. We have shown for the first time that materials with similar mean grain size but with distinct difference in their distribution behaves differently towards the nonlinear response of the ultrasonic waves. The distribution width is shown to influence the nonlinearity parameter considerably. On the material with a wider distribution, a reduced nonlinearity was noted, and comparable trends were also noted for different frequencies investigated.

Featured Image

Why is it important?

The results predict that the existing models which account for only the mean grain size when characterizing material degradation need to be modified more comprehensively to include the role of grain size distribution.