Crack Deflection under Mixed-Mode Loading Investigated via Generalized MTS Criterion

0547216 - ÚFM 2025 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Malíková, Lucie - Miarka, Petr - Šimonová, H.
Crack Deflection under Mixed-Mode Loading Investigated via Generalized MTS Criterion.
AIP Conference Proceedings. Vol. 2309. American Institute of Physics Inc., 2020 - (Rodriguez-Tembleque, L.; Aliabadi, F.), č. článku 0034664. ISBN 978-0-7354-4045-6. ISSN 0094-243X.
[FDM 2020 - International Conference on Fracture and Damage Mechanics /19./. Mallorca (ES), 15.09.2020-17.09.2020]
Institucionální podpora: RVO:68081723
Klíčová slova: Mixed-mode * Crack deflection angle * Finite element method * Williams expansion * Generalized MTS criterion
Obor OECD: Construction engineering, Municipal and structural engineering

The paper deals with investigations of a crack propagating in a semi-circular concrete disc loaded in bending. Various crack inclination angles ensure different degrees of I+II mixed-mode conditions. Generally, concrete material exhibits quasi-brittle fracture behavior, which is difficult to describe. It has been shown that fracture in this kind of material occurs in a larger zone around the crack tip. Thus, the multi-parameter fracture mechanics concept can help to understand the facture response better. Particularly, the Williams power expansion with a selected number of its initial terms is used for approximation of the crack-tip stress/displacement field. The over-deterministic method together with a finite element analysis of the problem is used for calculation of the coefficients of the series. The deflection angle of the initial crack is then assessed via generalized/multi-parameter form of Maximum Tangential Stress (MTS) criterion in dependence on various parameters. The theoretical results are compared to experimentally obtained data. The results prove that the multi-parameter description of the crack-tip fields can bring more accurate assessment of the fracture response of a crack under mixed-mode loading.
Trvalý link: http://hdl.handle.net/11104/0323531