On computational homogenization of microscale crack propagation
Artikel i vetenskaplig tidskrift, 2016

© 2016 John Wiley and Sons, Ltd. The effective response of microstructures undergoing crack propagation is studied by homogenizing the response of statistical volume elements (SVEs). Because conventional boundary conditions (Dirichlet, Neumann and strong periodic) all are inaccurate when cracks intersect the SVE boundary, we herein use first order homogenization to compare the performance of these boundary conditions during the initial stage of crack propagation in the microstructure, prior to macroscopic localization. Using weakly periodic boundary conditions that lead to a mixed formulation with displacements and boundary tractions as unknowns, we can adapt the traction approximation to the problem at hand to obtain better convergence with increasing SVE size. In particular, we show that a piecewise constant traction approximation, which has previously been shown to be efficient for stationary cracks, is more efficient than the conventional boundary conditions in terms of convergence also when crack propagation occurs on the microscale. The performance of the method is demonstrated by examples involving grain boundary crack propagation modelled by conventional cohesive interface elements as well as crack propagation modelled by means of the extended finite element method in combination with the concept of material forces.

Material forces

Multiscale modelling

Weak periodicity

Microcracks

Computational homogenization

XFEM

Författare

Erik Svenning

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Martin Fagerström

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Fredrik Larsson

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

International Journal for Numerical Methods in Engineering

0029-5981 (ISSN) 1097-0207 (eISSN)

Vol. 108 1 76-90

Flerskalig modellering av duktilt brott

Vetenskapsrådet (VR), 2013-01-01 -- 2016-12-31.

Ämneskategorier

Materialteknik

Teknisk mekanik

Infrastruktur

C3SE (Chalmers Centre for Computational Science and Engineering)

Styrkeområden

Materialvetenskap

DOI

10.1002/nme.5220

Mer information

Skapat

2017-10-07