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Implementation of a cohesive zone model for crack closure analysis of rotors
Author(s) -
Liong Rugerri Toni,
Proppe Carsten
Publication year - 2009
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200910065
Subject(s) - crack closure , structural engineering , finite element method , nonlinear system , closure (psychology) , vibration , stiffness , rotor (electric) , crack tip opening displacement , closing (real estate) , mechanics , materials science , engineering , fracture mechanics , physics , mechanical engineering , law , acoustics , quantum mechanics , political science
The presence of a crack in a rotor introduces a local flexibility which affects its dynamic response. Moreover, the crack may open and close during the vibration period. The crack status is a function of time and also depends on the rotational speed and the vibration amplitude of the rotor. This nonlinear case is still a challenging research topic especially in the field of closing crack in the rotating shaft. A cohesive zone model is developed in order to analyze the stiffness of a crack in a rotating shaft. The proposed expression will be compared to three different crack models, namely, a breathing crack model, a switching crack model and an open crack model. Moreover, a cohesive law to predict and to analyse the stress at the crack tip is presented. The numerical model is implemented using a finite element formulation. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)