[Mechanical response of Au (001) nanoplate under uniaxial stress condition along [100] direction] Under mechanical loading, metal nanoplates fail via elastic instability rather than the yield strength. As a result, we observed a unique “smaller is weaker” trend. We provided numerical and theoretical evidence to show that the nanoplates exhibit an intermediate […]
[Stress-drop due to phonon scattering around dislocation core while it is in motion] Unlike continuum, the motion of dislocation in nanoscale system induces unusual phenomenon. Through atomistic simulations, we observed that the internal effective stress of the system is always smaller than the externally applied stress during the dislocation motion. And we defined this unusual […]
According to Born (1940) and Hill (1977), a material becomes intrinsically unstable when its elastic moduli tensor (or modified one) loses its positive definiteness. It is true for bulk materials, but it is not exactly true in the case of nanowires, due to the so-called surface effect. The surface effect increases as the thickness of […]
According to continuum plate theory, the elastic stress waves propagate in plates in the form of Lamb waves due to stress-free surfaces. Through MD, we can compare the Lamb waves in nanoscale plate to those in continuum plate. MD is a useful method to evaluate the validity and limitation of solid mechanics theories for nanoscale […]