Coupling approaches for classical linear elasticity and bond-based peridynamic models

TL;DR

This paper compares three coupling methods for combining classical linear elasticity with bond-based peridynamics, analyzing their accuracy and performance through one-dimensional numerical examples.

Contribution

It provides a detailed comparison of three existing coupling approaches, focusing on their discrete formulations and accuracy in one-dimensional models.

Findings

All three methods achieve comparable accuracy in numerical examples.

The displacement matching approach shows slightly better performance in the tested scenarios.

The study highlights the strengths and limitations of each coupling method for local-nonlocal model integration.

Abstract

Local-nonlocal coupling approaches provide a means to combine the computational efficiency of local models and the accuracy of nonlocal models. This paper studies the continuous and discrete formulations of three existing approaches for the coupling of classical linear elasticity and bond-based peridynamic models, namely 1) a method that enforces matching displacements in an overlap region, 2) a variant that enforces a constraint on the stresses instead, and 3) a method that considers a variable horizon in the vicinity of the interfaces. The performance of the three coupling approaches is compared on a series of one-dimensional numerical examples that involve cubic and quartic manufactured solutions. Accuracy of the proposed methods is measured in terms of the difference between the solution to the coupling approach and the solution to the classical linear elasticity model, which can be viewed as a modeling error. The objective of the paper is to assess the quality and performance of the discrete formulation for this class of force-based coupling methods.