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A GENERALIZED CONCEPT OF A FATIGUE THRESHOLD
Author(s) -
Castro D. E.,
Marci G.,
Munz D.
Publication year - 1987
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.1460-2695.1987.tb00209.x
Subject(s) - materials science , inconel , fatigue testing , fatigue limit , range (aeronautics) , structural engineering , alloy , composite material , engineering
— The conditions for non‐propagating LEFM type fatigue cracks were investigated on an Inconel, 617 Alloy in the range of K max between 10 and 50 MPa m 1/2 under four different types of fatigue loading conditions. In all tests, K max was held constant during the fatigue cycling prior to determining the non‐propagation condition. It was found that with decreasing range of applied K the fatigue tolerance range Δ K eff, th increases. Furthermore, there is slight increase of Δ K eff,th with decreasing K max of approximately 20–30% when K max is decreased from 50 to 10 MPa m 1/2 . The results of the four types of tests are considered in respect to the damage in the near‐region of the crack front, i.e. increasing K max increases the damage zone and therefore decreases the fatigue tolerance range Δ K eff,th .