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In situ characterization of humidity effect on the fatigue damage evolution of a cast aluminium alloy
Author(s) -
Li Wenkai,
EnglerPinto C.C.,
Cui Haitao,
Wen Weidong,
Su Xuming
Publication year - 2016
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/ffe.12441
Subject(s) - ultrasonic sensor , materials science , humidity , aluminium , nonlinear system , alloy , aluminium alloy , composite material , characterization (materials science) , in situ , signal (programming language) , structural engineering , acoustics , engineering , meteorology , physics , computer science , quantum mechanics , programming language , nanotechnology
In this paper, the feedback signal of ultrasonic fatigue system was used to deduce the accumulated fatigue damage in situ using the ultrasonic nonlinearity parameter. It was observed that, compared with the decrease in resonant frequency, the ultrasonic nonlinearity parameter shows a greater sensitivity to fatigue damage evolution (i.e. crack initiation and propagation). Ultrasonic nonlinearity parameters obtained from tests conducted under various environmental humidity levels were monitored and analysed. Through changes in the ultrasonic nonlinearity parameter, it was concluded that both of the fatigue crack initiation life and crack propagation life were reduced by increasing the humidity levels.