T. Isogai et At. Yokobori, New concept on fatigue crack growth characteristics under combined stress conditions, INT J FRACT, 102(2), 2000, pp. L47-L52
Using thin walled cylindrical specimens subjected cyclic tension and torsio
n, fatigue crack growth tests under combined stress conditions were carried
out. The characteristics of the fatigue crack growth rate (FCGR) and morph
ology of the fatigue crack were identified.
By comparing the experimental results with the results of finite element an
alyses, it was found that the experimental characteristics of FCGR were rel
ated to fatigue damage accumulation before initial crack growth. Damage mec
hanics approach is indispensable to characterize the fatigue crack growth u
nder combined stress conditions.