PSI - Issue 23

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

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ScienceDirect

Procedia Structural Integrity 23 (2019) 328–333

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Abstract Prediction of quasi-br ttle behaviour of structu al components f om fibre einforced composites under mechanical loads should incorporate such physical processes as elastic, resp. plastic deformation, rack initiation, cr ck propagation i a matrix, pull out of fibres and rupture of fibres. The computational model for th practically m st important case of cementitious compo ites containing short intentionally or quasi-randomly riented steel, c ramic, resp. polym ric fibres with its primary import of sup pression of tensile stresses in a atrix will be introdu ed. Its numerical a p oach relies on the modified extended finite element technique (XFEM), open to the implementation of the cohesive traction separation law. © 201 9 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture Computational analysis of crack formation and propagation in quasi-brittle fibre reinforced composites Jiří Vala a , Vladislav Kozák b,* a Brno University of Technology, Faculty of Civil Engineering, Institute of Mathematics and Descript ive Geometry, 602 00 Brno, Veveří 331/95, Czech Republic b Institute of Physics of Materials, Academy of Sciences CR, 616 62 Brno, Žižkova 513 /22, Czech Republic Abstract Prediction of quasi-brittle behaviour of structural components from fibre reinforced composites under mechanical loads should incorporate such physical processes as elastic, resp. plastic deformation, crack initiation, crack propagation in a matrix, pull out of fibres and rupture of fibres. The computational model for the practically most important case of cementitious composites containing short intentionally or quasi-randomly oriented steel, ceramic, resp. polymeric fibres with its primary import of sup pression of tensile stresses in a matrix will be introduced. Its numerical approach relies on the modified extended finite element technique (XFEM), open to the implementation of the cohesive traction separation law. 9th International Conference on Materials Structure and Micromechanics of Fracture Computational analysis of crack formation and propagation in quasi-brittle fibre reinforced composites Jiří Vala a , Vladislav Kozák b,* a Brno University of Technology, Faculty of Civil Engineering, Institute of Mathematics and Descript ive Geometry, 602 00 Brno, Veveří 331/95, Czech Republic b Institute of Physics of Materials, Academy of Sciences CR, 616 62 Brno, Žižkova 513 /22, Czech Republic

Keywords: Quasi-brittle fracture; fibre reinforced composites; computational modelling; extended finite element method. Keywords: Quasi-brittle fracture; fibre reinforced composites; computational modelling; extended finite element method.

1. Introduction 1. Introduction

The fibre cementitious composites are in the class of perspective concrete, which increase the mechanical crack resistance, allow for a more subtle and economical construction; thus a new look at creating construction rigs re placing the steel structure is needed. Engineering structures subjected to loading may result in stresses in the body exceeding the material strength and thus results in the progressive failure. Such failures are often initiated by surface or near surface cracks, reducing the strength of the material. In quasi-brittle materials like rocks or concrete this is The fibre cementitious composites ar in the lass of perspective concrete, which increase the mechanical crack resistance, allow for a more subtl and economical construction; thus a new look at cr ating construction rigs re placing the steel structure is needed. Engineering structures subjected to loading may result in stresses in the body exceeding the material strength and thus results in the progressive failure. Such failures are often initiated by surface or near surface cracks, reducing the strength of the material. In quasi-brittle materials like rocks or concrete this is

* Corresponding author. Tel.: +420-532-290-364. E-mail address: kozak@ipm.cz * Correspon ing author. Tel.: +420-532-290-364. E-mail address: kozak@ipm.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.108