With the rapid development of nanotechnology, nano-composites with nano-additive agents play an important role in many fields. Nano additive agents take various types and some of them are embedded in the surface of the material to enhance its strength or hardness. Therefore, the studies for understanding the mechanical behavior of nano-inclusions in media are increasing day by day.
The scattering of SH waves was often applied to study the dynamic response around the different kinds of inclusions in the half space. From the preceding investigation results, it can be seen that the studies of the surface/interface effects on the dynamic behavior of inclusions are restricted to the circles. Furthermore, the researches on the effects based on the scattering theory of SH waves have been done much less than others.
Jang Paek San, a researcher at the Institute of Nano Science and Technology, investigated the scattering of SH waves by a semi-circle nano-inclusion embedded in the half space surface using the surface/interface elastic theory.
The numerical simulations showed the following. First, as the size of the inclusion decreases to a nanoscale, the value of DSCF (dynamic stress concentration factor) also decreases, which means that the interface effect tends to suppress the perturbation of the DSCF. Second, when the nano addition agents are added into the surface of a medium, the rigidity of the nano-inclusion should be much smaller than that of the medium. Third, in the case of nanoscale inclusion, the surface/interface effect should be considered.
You can find the details in his paper “Dynamic Stress around a semi-circle nano-inclusion embedded in the half space surface” in “Journal of the Brazilian Society of Mechanical Sciences and Engineering” (SCI).