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Numerical Analysis of Stake Mark Induced Failure of a Rotor Shaft
Author(s) -
Bambach M.,
AlBaouni M.,
Kilpatrick N.,
Soto S.,
Kretschmer M.,
Hirt G.
Publication year - 2010
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.200900095
Subject(s) - rotor (electric) , finite element method , structural engineering , bending , residual stress , ultimate tensile strength , stress (linguistics) , forging , residual , engineering , materials science , mechanics , physics , composite material , mathematics , mechanical engineering , linguistics , philosophy , algorithm
Abstract In this paper, the stake mark induced failure of a generator rotor forging is analysed using finite element analyses in combination with a Cockroft & Latham failure model. Evidence is found from damage analysis that the rotor failed due to micro cracks and residual stresses induced by a double stake mark, which was located at a position subject to concentrated rotating‐bending stress amplitudes and torsional mean stress. The analysis presented here verifies the results of the damage analysis by showing that the stake mark configuration of the failed rotor was the most detrimental among a number of similar configurations. According to the finite element analysis, this stake mark configuration combines a high probability of inducing propagating sub‐surface micro‐cracks with considerable tensile residual stresses.