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A METHOD TO REDUCE THE SCATTER IN FATIGUE CRACK GROWTH RATE DATA
Author(s) -
Zheng J.,
Powell B. E.
Publication year - 1997
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 - 10.1111/j.1460-2695.1997.tb01492.x
Subject(s) - growth rate , paris' law , reduction (mathematics) , materials science , range (aeronautics) , structural engineering , test data , data reduction , fracture mechanics , crack closure , mathematics , statistics , composite material , engineering , geometry , software engineering
— The scatter in experimentally determined fatigue crack growth rates is dependent, in part, on the data reduction process applied to the paired values of crack length and number of cycles recorded in crack growth tests. An additional data reduction process is proposed which replaces the original test data by a smooth curve. Analysis of mid‐range growth rate data for Udimet 720 shows that the introduction of this additional data reduction procedure reduces the scatter in the calculated growth rates, increases the effectiveness of Walker's method in accounting for the effects of stress ratio, and leads to more accurate predictions of the experimental crack propagation lives of test specimens.