Premium
CYCLIC CRACK RESISTANCE OF WELDED JOINTS WITH NON‐UNIFORM FIELDS OF RESIDUAL WELDING STRESSES
Author(s) -
Trufiakov V. I.,
Mikheev P. P.,
Knysh V. V.,
Kovalenko I. S.
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.tb01314.x
Subject(s) - materials science , welding , paris' law , residual stress , fracture mechanics , stress intensity factor , fracture (geology) , exponential function , structural engineering , crack growth resistance curve , composite material , crack closure , mathematics , engineering , mathematical analysis
— The use of linear elastic fracture mechanics to describe the kinetics of fatigue fracture of welded joints with high welding residual stresses (WRS) is experimentally evaluated in this paper. A correction analysis is used to show that the crack propagation rate of cracks in joints, as a function of the applied stress intensity factor, is linear on a log‐log scale in the Paris regime when non‐uniform fields of WRS are superimposed on the applied cyclic loading. It is shown that crack growth rates in joints with high WRS do not depend on the characteristics of the loading cycle. The parameters of the Paris exponential equation are determined by the initial WRS distribution, by the range of cyclic stresses and by the load ratio. A method for calculating the cyclic crack resistance of joints is proposed which explicitly allows for a non‐uniform field of WRS that influences the fatigue crack growth rate.