Publication detail

A Crack Approaching the Edge of the Aggregate

VYHLÍDAL, M. KLUSÁK, J.

Original Title

A Crack Approaching the Edge of the Aggregate

Type

journal article - other

Language

English

Original Abstract

In this work, the influence of a crack approaching the edge of the amphibolite inclusion on fracture behaviour of cement composite is investigated. Specimens of the nominal dimensions 40 × 40 × 160 mm with polygonal amphibolite inclusion of 8 × 8 × 40 mm were provided with an initial central edge notch with a depth 12 mm, which was made by diamond blade saw. To determine the influence of polygonal cavity on fracture behaviour, fracture tests were conducted via three-point bending. The aim of this work is to analyse the behaviour of such specimen by means of finite element method (FEM) principles in Ansys, Inc. software. For this reason, a simplified 2D model was created for plane strain conditions. The crack propagation assessment was based on generalized fracture mechanics approaches using a criterion of an average value of tangential stress determined in dependence on the polar angle coordinate θ. The results of numerical analysis indicate that the debonding in the close vicinity of the bottom edge of the inclusion occurred. In other words, imperfect compaction of the fresh mixture and a smooth surface of the aggregate leaded to the formation of poor interface with lower mechanical-fracture parameters. Further, cutting of the initial notch by a diamond saw blade results in a precrack length greater than expected.

Keywords

Amphibolite inclusion, Average tangential stress, Finite Element Method, Fracture Mechanics.

Authors

VYHLÍDAL, M.; KLUSÁK, J.

Released

30. 12. 2020

Publisher

Faculty of Civil Engineering, VSB - TUO

Location

Ostrava

ISBN

1804-4824

Periodical

Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series

Year of study

20

Number

2

State

Czech Republic

Pages from

47

Pages to

52

Pages count

6

URL

http://tces.vsb.cz/Home/ArticleDetail/509

BibTex

@article{BUT168044,
  author="Michal {Vyhlídal} and Jan {Klusák}",
  title="A Crack Approaching the Edge of the Aggregate",
  journal="Transactions of the VŠB – Technical University of Ostrava, Civil Engineering Series",
  year="2020",
  volume="20",
  number="2",
  pages="47--52",
  doi="10.35181/tces-2020-0017",
  issn="1804-4824",
  url="http://tces.vsb.cz/Home/ArticleDetail/509"
}