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A TECHNICAL NOTE. INFLUENCE OF MEAN STRESS ON FATIGUE IN SEVERAL ALUMINIUM ALLOYS UTILIZING K c max THRESHOLD PROCEDURES
Author(s) -
Clark T. R.,
Herman W. A.,
Hertzberg R. W.,
Jaccard R.
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.tb01029.x
Subject(s) - aluminium , closure (psychology) , mathematics , stress (linguistics) , materials science , metallurgy , thermodynamics , forensic engineering , physics , engineering , philosophy , law , political science , linguistics
— Recent interest in the constant K max ( K c max ) threshold testing procedure has resulted in a more in‐depth study of the influence of K max level on fatigue response and Δ K th in aluminium alloys. Under R c = 0.1 conditions, which cause large amounts of closure, Δ K th levels were typically 2 to 4 Mpam. However, under K c max test procedures, associated with no measurable closure at threshold, Δ K th was typically 1 Mpam. A slight K c max level effect on Δ K th was observed at high K max values for some of the alloys, and was deemed to be a pure mean stress effect, separate from closure arguments.