Three-dimensional stress-gradient non-locality problem: Displacement field for an arbitrary and a conservative force

Abstract

In order to obtain the displacement field, both generally in the case of an arbitrary body force and specifically in the case of a conservative body force, the mechanical problem of statics of three-dimensional stress-gradient non-local medium is analytically solved on unbounded domain by considering a system of equations consisting of an equilibrium equation, infinitesimal strain, and both scalar- and tensor-type stress-gradient Eringen three-dimensional models. Since the system of equations is linear, for each model the solution is obtained in the form of a superposition of the local-type displacement field, common to each model, and the non-local-type displacement field, specific to the non-locality operator of the model. Among the three scalar-type and five tensor-type considered models, six distinct analytical displacement field expressions are obtained for an arbitrary body force: one expression specific to a scalar-type model, three specific to individual tensor-type models, while each of the remaining two expressions are common to one scalar- and one tensor-type model. The displacement vector fields are graphically represented in the case of gravitational body force, yielding five different models, since two tensor-type models become the same when the force is conservative.