Original title: Numerical prediction of parasitic energy dissipation in wedge splitting tests on concrete specimens
Authors: Veselý, V. ; Holušová, Táňa ; Seitl, Stanislav
Document type: Papers
Conference/Event: Engineering Mechanics 2012 /18./, Svratka (CZ), 2012-05-14 / 2012-05-17
Year: 2012
Language: eng
Abstract: Undesirable energy dissipation taking place during wedge-splitting tests on cementitious composites and resulting in overestimation of the values of the determined fracture-mechanical characteristics of the tested materials is investigated in this paper via numerical simulations performed using a commercial finite element method tool with an implemented cohesive crack model. The rather broad range of cohesive behaviour of the studied materials was simulated through adjustments made to the corresponding characteristic length of the composite. The parasitic amount of energy is dissipated in fracture processes around the corners of the groove for the insertion of the loading platens, as these corners introduce rather strong stress concentrators to the specimen. This amount was extracted from simulated load-displacement curves and it was discovered that the amount considerably depends on the specimen proportions but its dependence on the level of material brittleness is not so significant.
Keywords: concrete fracture; energy dissipation; numerical simulation; specimen proportions; wedge-splitting test
Project no.: GAP105/11/1551 (CEP)
Funding provider: GA ČR
Host item entry: Proceedings of Engineering Mechanics 2012, ISBN 978-80-86246-40-6

Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0216487

Permalink: http://www.nusl.cz/ntk/nusl-136007


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