Effects of dislocation on electron work function of metal surface
The great sensitivity of the electron work function (EWF) to surface condition has attracted increasing interest from surface scientists and tribologists. However, the effect of deformation on the EWF is unclear; this results in difficulty in applying the EWF in order to properly characterise tribological behaviour of materials. In this study, a simple electrostatic action model is proposed to investigate the effect of a dislocation on the EWF of a one-dimensional lattice. Using the model, one may illustrate how a dislocation influences the EWF. It has been demonstrated that the dislocation decreases the EWF and that both tensile and compressive plastic deformations can decrease the EWF. However, the situation is different if the deformation is in the elastic range.
Abstract Mathematical modelling for a class of flexible robot with two links and three joints is considered in this paper. Assume that one of the two links is elastic and that the deformatin of the elastic link happens along any direction perpendicular to the longitudinal axis of the elastic link. Using the dynamics and Hamilton 's variational principle, we deduce that the transverse displacement (deformation) of the elastic link and the revolved angles should satisfy a system that is composed of two elastic partial differential equations of order four and three nonlinear integrodifferential equations.