0386405 - ÚFM 2013 RIV CZ eng C - Conference Paper (international conference)
Veselý, V. - Holušová, Táňa - Seitl, Stanislav
Numerical prediction of parasitic energy dissipation in wedge splitting tests on concrete specimens.
Proceedings of Engineering Mechanics 2012. Praha: Institute of Theoretical and Applied Mechanics AS CR, v.v.i, 2012 - (Náprstek, J.; Fischer, C.), s. 1497-1504. ISBN 978-80-86246-40-6.
[Engineering Mechanics 2012 /18./. Svratka (CZ), 14.05.2012-17.05.2012]
R&D Projects: GA ČR(CZ) GAP105/11/1551
Institutional support: RVO:68081723
Keywords : wedge-splitting test * concrete fracture * specimen proportions * energy dissipation * numerical simulation
Subject RIV: JL - Materials Fatigue, Friction Mechanics

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.
Permanent Link: http://hdl.handle.net/11104/0216487