PSI - Issue 17

Available online at www.sciencedirect.com Structural I tegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 17 (2019) 690–697

ICSI 2019 The 3rd International Conference on Structural Integrity The influence of polygonal cavity on fracture behaviour of concrete Michal Vyhlídal a, *, Jan Klusák b ICSI 2019 The 3rd International Conference on Structural Integrity The influence of polygonal cavity on fracture behaviour of concrete Michal Vyhlídal a, *, Jan Klusák b

a Brno University of Technology, Faculty of Civil Engineering, Veveří 331/95, 602 00 Brno, Czech Republic b Czech Academy of Sciences, Institute of Physics of Materials, Žižkova 513/22, 616 62 Brno, Czech Republic a Brno University of Technology, Faculty of C vil Engin ering, Veveří 331/95, 02 00 r , zech epublic b Czech Academy of Sciences, Institute of Physics of Materials, Žižkova 513/22, 616 62 Brno, Czech Republic

Abstract Abstract

In this work, the influence of polygonal cavity on fracture behaviour of cement composite (concrete) is investigated. Specimens of the nominal dimensions 40 × 40 × 160 mm with polygonal cavity 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 and based on the fracture test configuration. 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 θ. Results of numerical analysis indicates that the actual crack depth must be greater than it supposed. In other words, diamond blade saw damage the specimen more than expected. In t is work, the influence of polygonal cavity on fracture behaviour of cement co posite (concrete) is investigated. Specimens of the nominal dimensions 40 × 40 × 160 mm with polygonal cavity of 8 × 8 × 40 mm were provided with an initial ce tral edg notch with a depth 12 mm, whi h was made by diam nd blade saw. To determine the influence of polygonal cavity on fracture behaviour, fracture tests w r conducted via three-point bending. The aim of this work is to an lyse 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 and based on the fracture test confi uration. The crack propagation assessment was based generalized fracture mechanics approaches using a criterion of an average value of tangential stress determined in depe dence on the polar a gle θ. Results of numerical analysis indicates that the actual crack depth must be greater than it supposed. In other words, diamond blade saw damage the specimen more than expected.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Average tangential stress; Finite element method; Fracture mechanics; Polygonal cavity. Keywords: Average tangential stress; Finite element method; Fracture mechanics; Polygonal cavity.

1. Introduction 1. Introduction

Silicate-based materials, mainly concrete as a representative of such composites, belong to the widely used building materials. Concrete structures such as: highway bridges, cooling towers of power plants, hydraulic structures (dams), etc. are parts of important infrastructures and should serve many generations since their construction. Traditionally, these structures are designed using a procedure mentioned in standards, Silicate-based materials, mainly concrete as a representative of such composites, belong to the widely used building materials. Concrete structures such as: highway bridges, cooling towers of power plants, hydraulic structures (dams), etc. are parts of important infrastructures and should serve many generations since their construction. Traditionally, these structures are designed using a procedure mentioned in standards,

* Corresponding author. Tel.: +420 541 147 131; E-mail address: Michal.Vyhlidal@vutbr.cz * Correspon ing author. Tel.: +420 541 147 131; E-mail address: Michal.Vyhlidal@vutbr.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.092