The Influence of Constraint Level on Crack Path

0331834 - ÚFM 2010 RIV IT eng A - Abstract
Ševčík, Martin - Hutař, Pavel - Náhlík, Luboš - Seitl, Stanislav
The Influence of Constraint Level on Crack Path.
Proceedings of the international conference on Crack Paths. Padua: University Padua, 2009 - (Atzori, B.; Carpinteri, A.; Pook, L.). s. 105-105
[Crack Paths 2009. 23.09.2009-25.09.2009, Vicenza]
R&D Projects: GA AV ČR 1QS200410502; GA ČR GA101/09/0867; GA ČR GA101/08/1623
Institutional research plan: CEZ:AV0Z20410507
Keywords : constraint * crack propagation * T-stress * FEM
Subject RIV: JL - Materials Fatigue, Friction Mechanics

The main aim of the work was to estimate effect of the constraint on the predicted crack path and show the cases where the failure of the component could be described more precisely by constraint-based description. A special specimen geometry with a high level of constraint was used. Numerical predictions of the crack path in a modified CT specimen are compared with experimental results. The numerical prediction of the crack path based on a modified Maximum Tangential Stress (MTS) criterion (the criterion uses a two-parameter description of the stress field around the crack tip) is generally in agreement with the experimental data. The classical MTS criterion was found much more sensitive on the crack increment. It can therefore be concluded, that the modified criterion in the framework of two-parameter linear elastic fracture mechanics estimated the crack path more precisely only in the case of a high level of constraint.
Permanent Link: http://hdl.handle.net/11104/0177245