Non-Standard Extensions of Gradient Elasticity: Fractional Non-Locality, Memory and Fractality

TL;DR

This paper extends classical elasticity theory using fractional calculus to model materials with non-local, memory, and fractal properties, providing new variational principles and generalized beam equations.

Contribution

It introduces a fractional variational framework for elasticity, enabling modeling of complex material behaviors like non-locality, memory, and fractality, with derived generalized beam equations.

Findings

Derived fractional variational equations for non-local and fractal materials.

Generalized Euler-Bernoulli and Timoshenko beam equations.

Demonstrated applicability to complex material properties.

Abstract

Derivatives and integrals of non-integer order may have a wide application in describing complex properties of materials including long-term memory, non-locality of power-law type and fractality. In this paper we consider extensions of elasticity theory that allow us to describe elasticity of materials with fractional non-locality, memory and fractality. The basis of our consideration is an extension of the usual variational principle for fractional non-locality and fractality. For materials with power-law non-locality described by Riesz derivatives of non-integer order, we suggest a fractional variational equation. Equations for fractal materials are derived by a generalization of the variational principle for fractal media. We demonstrate the suggested approaches to derive corresponding generalizations of the Euler-Bernoulli beam and the Timoshenko beam equations for the considered fractional non-local and fractal models. Various equations for materials with fractional non-locality, fractality and fractional acceleration are considered.