Browsing by Author "Seitl, Stanislav"
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Cement based composites for thin building elements: Fracture and fatigue parameters
Seitl, Stanislav; Bílek, Vlastimil; Keršner, Zbyněk; Veselý, Jiří (Elsevier, 2010-06-06)For application in civil engineering structures and also for strengthening existing structures cement-based composites are one of the most frequently used materials. Although many studies have been conducted on the mechanical ... -
Comparison of Fracture Resistance of the Normal and High Strength Concrete Evaluated by Brazilian Disc Test
Miarka, Petr; Seitl, Stanislav; Bílek, Vlastimil (MPDI, 2018-05-19)Nowadays, high performance concrete is used more frequently because of the many advantages compared to traditional concrete. The higher mechanical properties (e.g., compressive strength, flexural strength, and Young’s ... -
Determining fracture energy parameters of concrete from the modified compact tension test
Fernández-Canteli, Alfonso; Castaón, Laura; Nieto, Belen; Lozano, Miguel; Holušová, Táňa; Seitl, Stanislav (Gruppo Italiano Frattura, 2014-09-01)The modified compact tension (MCT) test, though not yet recognized as a valid test for determining fracture energy of concrete, is believed to represent a plausible and suitable alternative versus other well established ... -
Estimation of the crack propagation direction in a mixed-mode geometry via multi-parameter fracture criteria
Malíková, Lucie; Veselý, Václav; Seitl, Stanislav (Gruppo Italiano Frattura, 2015-08-15)The presented work introduces a numerical parametric study on the crack propagation direction under mixed-mode conditions (mode I + II). It is conducted for the geometry of an eccentric asymmetric four-point bending of a ... -
Evaluation of mixed mode I/II fracture toughness of C 50/60 from Brazilian disc test
Seitl, Stanislav; Miarka, Petr (Gruppo Italiano Frattura, 2017-10-01)Durability and sustainability of structures made from concrete like materials is getting more into an interest of civil engineers. Structures are subjected not only to uniaxial load, this means if there is a crack inside ... -
Fracture Mechanical Properties of Cement Based Composites with Various Amount of Waste Aggregates
Seitl, Stanislav; Viszlay, Viliam; Domski, Jacek; Katzer, Jacek (Elsevier, 2017-01-05)The importance of sustainability and recycling has become increasingly recognized and understood in academia and industry over the last several decades. Recycling of construction and debris waste is one of many avenues ... -
Glass fibre reinforced cement based composite: fatigue and fracture parameters
Seitl, Stanislav; Keršner, Zbyněk; Bílek, Vlastimil; Knésl, Zdeněk (2009-06-15)This paper introduces the basic fracture mechanics parameters of advanced building material - glass fibres reinforced cement based composite and its fracture and fatigue behaviour is investigated. To this aim three-point ... -
Impact of specific fracture energy investigated in front of the crack tip of three-point bending specimen
Klon, Jiří; Sobek, Jakub; Malíková, Lucie; Seitl, Stanislav (Gruppo Italiano Frattura, 2017-07-01)Presented study is focused on the analysis of the dependence of the specific fracture energy value on the assumed work of fracture in three-point bending tests. Specimens of different sizes and relative notch lengths are ... -
Influence of Micro-Structure on the Fatigue Crack Propagation in Bridge Steel
Seitl, Stanislav; Miarka, Petr; Pokorný, Pavel; Fintová, Stanislava; Klusák, Jan (MDPI, 2018-06-19)The use of high strength steels (HSS) allows designing lighter, slenderer and simpler structures with high structural performance. In general, the use of HSS leads to weight reduction of the whole structure, which compensates ... -
Influence of the gripping fixture on the modified compact tension test results: evaluation of the experiments on cylindrical concrete specimens
Holušová, Táňa; Lozano, Miguel; Fernández-Canteli, Alfonso; Komárková, Tereza; Kocáb, Dalibor; Seitl, Stanislav (VŠB-TUO, 2015-12-18)The modified compact tension test (MCT) might become in the future a stable test configuration for the evaluation of fracture-mechanics parameters or also for description of fatigue behavior of composites materials such ... -
Lomová procesní zóna a disipace energie při lomu kvazikřehkých materiálů
Klon, JiříPráce je zaměřena na porovnání vybraných lomových parametrů kvazikřehkého materiálu, konkrétně betonu, určovaných z výsledků testů na tělesech různých velikostí a délek zářezu. První část práce se zabývá studiem vybraných ... -
Modified compact tension specimen for experiments on cement based materials: comparison of calibration curves from 2D and 3D numerical solutions
Seitl, Stanislav; Viszlay, Viliam (Gruppo Italiano Frattura, 2017-01-01)The evaluation of fracture mechanics parameters of materials has become very important part of considering the condition of older constructions as well as properties of newly developed materials. This contribution focuses ... -
Multi-parameter approximation of stress field in a cracked specimen using purpose-built Java applications
Veselý, Václav; Sobek, Jakub; Tesař, David; Frantík, Petr; Pail, Tomáš; Seitl, Stanislav (Gruppo Italiano Frattura, 2015-05-15)A quality of multi-parameter approximation of the stress and displacement fields around a crack tip in a non-brittle material test specimen is studied in the paper. The stress field approximation using Williams power series ... -
Multi-parameter crack tip stress state description for estimation of fracture process zone extent in silicate composite WST specimens
Veselý, Václav; Sobek, Jakub; Malíková, Lucie; Frantík, Petr; Seitl, Stanislav (Gruppo Italiano Frattura, 2013-04-15)For wedge splitting test specimens, the stress and displacement fields both in the vicinity and also in large distance from the crack tip are investigated by means of numerical methods. Several variants of boundary conditions ... -
Numerical study of thin HPC overlay for orthotropic bridge deck
Miarka, PetrDiplomová práce porovnává tři různé betonové směsi pro celkové ztužení ortotropní mostovky a zkoumá jejich vliv na redukci napětí ve zvoleném svarovém přípoji. Práce uvažuje se standartní zatěžovací situaci mostu, ale také ... -
A numerical study of two different specimen fixtures for the modified compact tension test – their influence on concrete fracture parameters
Holušová, Táňa; Seitl, Stanislav; Cifuentes, Héctor; Fernández-Canteli, Alfonso (Gruppo Italiano Frattura, 2016-01-01)The modified compact tension test (MCT) may represent a new test configuration for the performance of static and other kinds of fatigue tests on concrete-like materials. Core drilling can be employed to obtain specimens ... -
Numerická podpora pro analýzu únavového chování cementových kompozitů
Viszlay, ViliamTáto práca sa zaoberá numerickou podporou stanovenia lomovo mechanických parametrov pri modifikovanej CT skúške. Táto skúška sa javí ako vhodná alternatíva klasickej CT skúšky pre únavové testovanie kvazikrehkých materiálov. ... -
Ohýbaná tělesa: Numerická podpora v software ANSYS
Viszlay, ViliamPráca sa zaoberá skúmaním lomovo-mechanických parametrov na telesách z kvazikrehkých materiálov. Využíva k tomu postupy dvojparametrovej lomovej mechaniky. Na základe numerických simulácií prevedených v softwarovom prostredí ... -
Over-deterministic method: The influence of rounding numbers on the accuracy of the values of Williams' expansion terms
Růžička, Vladimír; Malíková, Lucie; Seitl, Stanislav (Gruppo Italiano Frattura, 2017-11-01)A study on the accuracy of the values of Williams’ expansion terms influenced by rounding numbers is presented. The results are presented taking into account a three-point bend single edge notched beam. Crack tip stress ... -
Pilot evaluation of a fracture process zone in a modified compact tension specimen by X-ray tomography
Klon, Jiří; Seitl, Stanislav; Šimonová, Hana; Keršner, Zbyněk; Kumpová, Ivana; Vavřík, Daniel (Italian Group of Fracture, 2017-10-03)In the case of quasi-brittle material, there is a zone of non-linear behaving material, near the crack tip. A major part of this zone forms a so-called fracture process zone (FPZ), where mechanisms of material toughening ...