TY - JOUR
T1 - Behavior of small cracks under negative stress ratio fatigue loading
AU - Roiko, Andrew
AU - Solin, Jussi
AU - Hänninen, Hannu
PY - 2017
Y1 - 2017
N2 - In this paper we analyze growth of small cracks initiated
from microscopic notches and loaded near the growth
threshold under different stress ratios. The results of
in-situ optical measurements during high cycle fatigue
testing show that small cracks initiate and grow quickly
after which there is a long period of slow growth until
the large crack growth threshold is reached. The crack
growth rate data from different loading ratios indicates
that the positive portion of the stress amplitude or the
maximum stress intensity factor can be used to compare
crack growth rates. The test data also shows that
increasing only the compressive stress portion of the
loading will cause an arrested small crack to grow again.
AB - In this paper we analyze growth of small cracks initiated
from microscopic notches and loaded near the growth
threshold under different stress ratios. The results of
in-situ optical measurements during high cycle fatigue
testing show that small cracks initiate and grow quickly
after which there is a long period of slow growth until
the large crack growth threshold is reached. The crack
growth rate data from different loading ratios indicates
that the positive portion of the stress amplitude or the
maximum stress intensity factor can be used to compare
crack growth rates. The test data also shows that
increasing only the compressive stress portion of the
loading will cause an arrested small crack to grow again.
UR - http://www.scopus.com/inward/record.url?scp=85028373308&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2017.07.006
DO - 10.1016/j.ijfatigue.2017.07.006
M3 - Article
SN - 0142-1123
VL - 104
SP - 379
EP - 388
JO - International Journal of Fatigue
JF - International Journal of Fatigue
ER -