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Small crack growth in combined bending–torsion fatigue of A533B steel
Author(s) -
Park J.,
Nelson D.,
Rostami A.
Publication year - 2001
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.2001.00386.x
Subject(s) - materials science , paris' law , torsion (gastropod) , crack closure , structural engineering , stress intensity factor , growth rate , bending , composite material , crack growth resistance curve , fracture mechanics , strain energy release rate , mathematics , geometry , engineering , surgery , medicine
Crack growth rate data from bending, torsional and in‐plane and 90° out‐of‐phase combined bending–torsional fatigue tests of A533B steel are presented. Crack growth was monitored from initial sizes generally in the range of 50–300 μm to final sizes of several millimetres. Crack growth rate was found to vary linearly with crack size. Two approaches for correlating the A533B crack growth rate were evaluated, an effective strain‐based intensity factor range and a method based on total cyclic strain energy density. The approaches were also evaluated using small crack growth data from the literature for SAE 1045 steel and Inconel 718 specimens tested under axial–torsional loadings. Predicted crack growth lives using both approaches were found to agree within a factor of two of observed lives for nearly all of the data examined.