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- Title
In situ characterization of humidity effect on the fatigue damage evolution of a cast aluminium alloy.
- Authors
Li, Wenkai; Engler‐Pinto, C.C.; Cui, Haitao; Wen, Weidong; Su, Xuming
- Abstract
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.
- Subjects
HUMIDITY; FATIGUE (Physiology); ALUMINUM alloys; NONLINEAR theories; CRACK propagation (Fracture mechanics)
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2016, Vol 39, Issue 10, p1263
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12441