PSI - Issue 28

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 403–410

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract The paper is devoted to investigations on the crack deflection angle under mixed-mode loading conditions. Several semi-circular disc configurations with an inclined crack under three-point bending are suggested and its fracture behavior is analyzed experimentally as well numerically. Various mixed-mode levels are obtained via varying basic parameters, such as crack length and/or crack inclination angle. Williams power expansion is applied for approximation of the crack-tip stress field to generalize the common strain energy density criterion. This procedure of estimation of the crack deflection angle is tested because it can bring more accurate results when materials with specific fracture response is used. Experimental and numerical results are compared and discussed to formulate recommendations on using classical or generalized fracture criterion. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: Mixed-mode; Generalized strain energy density criterion; Crack deflection angle; Finite element method; Williams expansion 1. Introduction Concrete represents a material with a specific fracture response that is often called as quasi-brittle. In comparison to brittle materials, fracture processes in concrete occur in a more distant surrounding around the crack tip. Therefore, common procedures derived for assessment of fracture behavior of a crack cannot be applied. Several recent works show that the singular term of the crack-tip stress field approximation is generally not dominant and shall be 1st Virtual European Conference on Fracture Mixed-mode crack propagation in a semi-circular disc under bending made of an environmental-friendly concrete Lucie Malikova a,b, *, Petr Miarka a,b , Hana Simonova a a Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics, Veveri 331/95, 602 00 Brno, Czech Republic b Institute of Physics of Mechanics, Czech Academy of Sciences, v.v.i., Zizkova 513/22, 616 62 Brno, Czech Republic Abstract The paper is devoted to investigations on the crack deflection angle under mixed-mode loading conditions. Several semi-circular disc configurati ns with an ncl ned crack under thr e-point b nding are suggest d nd its fracture behavior is analyzed experimentally as well numerical y. Various mixed-mod levels are obtained via varying basic parameters, such as crack length and/or crack inclination angle. Williams power expansion is applied for approximation of the crack-tip stress field to generalize the c mmon strai energy density cr terion. This procedure of estimation of the crack deflection angle is test d because it can bring more accurate esults when materials with specific fract response is used. Experimental and numerical results are comp red a d discussed to fo m ate reco m ndations on us ng cl ssical or ge eralized fracture criterion. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of European Structural Integri y Society (ESIS) ExCo Keywords: Mixed-mode; Generalized strain energy density criterion; Crack deflection angle; Finite element method; Williams expansion 1. Introduction Concrete represents a material with a specific fracture response that is often called as quasi-brittle. In comparison to brittle materials, fracture processes in con rete oc ur in a m re dist nt surrounding around the crack tip. Therefore, c mmon procedures deriv d f r a sessme t of fra ture behavior of a crack ca not be applied. Several recent w rks show that the singular term f th crack-tip stress field pp oximation is generally not ominant and shall be 1st Virtual European Conference on Fracture Mixed-mode crack propagation in a semi-circular disc under bending made of an environmental-friendly concrete Lucie Malikova a,b, *, Petr Miarka a,b , Hana Simonova a a Brno University of Technology, Faculty of Civil Engineering, Institute of Structural Mechanics, Veveri 331/95, 602 00 Brno, Czech Republic b Institute of Physics of Mechanics, Czech Academy of Sciences, v.v.i., Zizkova 513/22, 616 62 Brno, Czech Republic

* Corresponding author. Tel.: +420 54114 7381. E-mail address: malikova.l@fce.vutbr.cz * Corresponding author. Tel.: +420 54114 7381. E-mail address: malikova.l@fce.vutbr.cz

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.047