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VARIABLE AMPLITUDE LOADING IN En8 (080M40) STEEL: A DETAILED EXPERIMENTAL STUDY OF CRACK GROWTH
Author(s) -
Ng'ang'a S. P.,
James M. N.
Publication year - 1996
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.1460-2695.1996.tb00960.x
Subject(s) - materials science , amplitude , crack closure , structural engineering , bending , transient (computer programming) , growth rate , closure (psychology) , mechanics , range (aeronautics) , composite material , fracture mechanics , engineering , mathematics , computer science , geometry , physics , quantum mechanics , market economy , economics , operating system
—The load interaction effects that occur under variable amplitude loading conditions following single peak overloads, low‐high blocks and high‐low blocks have been investigated on a commonly used structural steel. A detailed investigation has been carried out on long cracks which aims at developing and assessing the efficacy of a simple predictive model based on closure and plastic zone effects. The material was tested in a quenched and tempered condition. All the tests were carried out in the four point bending mode, in both the Paris regime and near the threshold, with overloads ranging from 10% to 100%. An attempt to relate crack closure to crack growth rates in the transient growth rate region (which follows a load change) was made. The trends observed for a wide range of loading parameters are presented.