Premium
THE USE OF SPATE TO MEASURE RESIDUAL STRESSES AND FATIGUE CRACK GROWTH
Author(s) -
Leaity G. P.,
Smith† R. A.
Publication year - 1989
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.1460-2695.1989.tb00536.x
Subject(s) - paris' law , residual stress , materials science , stress intensity factor , crack closure , tension (geology) , structural engineering , stress concentration , residual , fatigue testing , growth rate , composite material , fracture mechanics , mathematics , compression (physics) , engineering , geometry , algorithm
— —SPATE was used to monitor thermoemissions during fatigue crack propagation tests conducted on centre‐cracked tension (CCT) specimens at different mean stress levels, and on CCT specimens containing compressive residual stresses. The results obtained showed the SPATE stress intensity factor (SIF) predictions to correlate with the applied SIF range rather than the effective SIF range, thus demonstrating that SPATE was unable to account for the effects of mean stress and residual stress on fatigue crack growth. Further, although SPATE can be used to predict fatigue crack growth rates faster than 10– 8 m/cycle, in the region of low growth rates slower than this, the prediction of growth rates became impractical. Even at maximum resolution and scan time, the technique was unable to detect the changes in thermoemission caused by such small and slow crack tip advances.