A quadtree-polygon-based scaled boundary finite element method for image-based mesoscale fracture modelling in concrete

H Guo, ET Ooi, AA Saputra, Zhenjun Yang, S Natarajan, EH Ooi, CM Song

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A quadtree-polygon scaled boundary finite element-based approach for image-based modelling of concrete fracture at the mesoscale is developed. Digital images representing the two-phase mesostructure of concrete, which comprises of coarse aggregates and mortar are either generated using a take-and-place algorithm with a user-defined aggregate volume ratio or obtained from X-ray computed tomography as an input. The digital images are automatically discretised for analysis by applying a balanced quadtree decomposition in combination with a smoothing operation. The scaled boundary finite element method is applied to model the constituents in the concrete mesostructure. A quadtree formulation within the framework of the scaled boundary finite element method is advantageous in that the displacement compatibility between the cells are automatically preserved even in the presence of hanging nodes. Moreover, the geometric flexibility of the scaled boundary finite element method facilitates the use of arbitrary sided polygons, allowing better representation of the aggregate boundaries. The computational burden is significantly reduced as there are only finite number of cell types in a balanced quadtree mesh. The cells in the mesh are connected to each other using cohesive interface elements with appropriate softening laws to model the fracture of the mesostructure. Parametric studies are carried out on concrete specimens subjected to uniaxial tension to investigate the effects of various parameters e.g. aggregate size distribution, porosity and aggregate volume ratio on the fracture of concrete at the meso-scale. Mesoscale fracture of concrete specimens obtained from X-ray computed tomography scans are carried out to demonstrate its feasibility.

Original languageEnglish
Pages (from-to)420-441
Number of pages22
JournalEngineering Fracture Mechanics
Volume211
Early online date20 Feb 2019
DOIs
Publication statusPublished - 15 Apr 2019

Fingerprint

Insulator Elements
Concretes
Finite element method
Tomography
X rays
Mortar
Porosity
Decomposition

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Engineering Fracture Mechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Engineering Fracture Mechanics, [211], (2019)
DOI: 10.1016/j.engfracmech.2019.02.021

© 2019, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Concrete
  • Fracture
  • Image-based analysis
  • Meso-scale
  • Polygon
  • Quadtree
  • Scaled boundary finite element method

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

A quadtree-polygon-based scaled boundary finite element method for image-based mesoscale fracture modelling in concrete. / Guo, H; Ooi, ET; Saputra, AA; Yang, Zhenjun; Natarajan, S; Ooi, EH; Song, CM.

In: Engineering Fracture Mechanics, Vol. 211, 15.04.2019, p. 420-441.

Research output: Contribution to journalArticle

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