TY - JOUR
T1 - Acceleration of fatigue crack growth due to occasional mode II loading in 7075 aluminum alloy
AU - Matsunaga, H.
AU - Makizaki, M.
AU - Socie, D. F.
AU - Yanase, K.
AU - Endo, M.
N1 - Funding Information:
This research was in part sponsored by Japanese Ministry of Education, Science, Sports and Culture , Grant-in-Aid for Scientific Research (C) (Fund number 22560092 , 2010–2012) and in part by Shiraisi Research Fund (Fukuoka University). The first author gratefully acknowledges the support of the International Institute for Carbon Neutral Energy Research (WPI-I2CNER), sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology.
PY - 2014/6
Y1 - 2014/6
N2 - The effect of an occasional mode II loading on the subsequent mode I fatigue crack growth was investigated in a thin-walled 7075-T6511 aluminum alloy tube. Careful observation of crack growth behavior revealed that an occasional mode II loading has two contrasting effects on the subsequent crack growth. First is a retardation effect that is associated with a crack closure development due to the mode II loading. However, this effect was insignificant with respect to the crack growth life as a whole. Second is an acceleration effect that is associated with an accelerated crack growth rate in mode II. It was found that, in a relatively high δ. K regime, mode II crack growth was from one to two orders of magnitude faster than mode I crack growth. This study shows that mode II crack growth should be considered as a predominant factor in evaluating the effect of an occasional mode II loading for a mode I crack in 7075 aluminum alloy.
AB - The effect of an occasional mode II loading on the subsequent mode I fatigue crack growth was investigated in a thin-walled 7075-T6511 aluminum alloy tube. Careful observation of crack growth behavior revealed that an occasional mode II loading has two contrasting effects on the subsequent crack growth. First is a retardation effect that is associated with a crack closure development due to the mode II loading. However, this effect was insignificant with respect to the crack growth life as a whole. Second is an acceleration effect that is associated with an accelerated crack growth rate in mode II. It was found that, in a relatively high δ. K regime, mode II crack growth was from one to two orders of magnitude faster than mode I crack growth. This study shows that mode II crack growth should be considered as a predominant factor in evaluating the effect of an occasional mode II loading for a mode I crack in 7075 aluminum alloy.
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U2 - 10.1016/j.engfracmech.2014.04.015
DO - 10.1016/j.engfracmech.2014.04.015
M3 - Article
AN - SCOPUS:84901930883
SN - 0013-7944
VL - 123
SP - 126
EP - 136
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
ER -