期刊
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
卷 58-59, 期 -, 页码 128-142出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2014.11.010
关键词
Breathing cracks; Cantilever beam; Cyclostationarity; Fatigue damage; Non-linearity of the stiffness
In this paper, we present the second-order of cyclostationarity to detect and diagnose the fatigue damage of the stainless steel 3161 subjected to low cycle fatigue (LCF). LCF is defined by repetitive cycling in a low stress and a short period. The vibration response of material subjected to LCF provides information linked to the solicitation and to the fatigue damage. Thus, we considered a cantilever beam with breathing cracks and assumed that under the solicitation, breathing cracks generates non-linearity in the stiffness of the material and this one decreases with the damage. We used the second-order of the cyclostationarity to reveal this non-linearity and showed that the fatigue provide a random component in the signal, which increases with the fatigue damage. Thus, in the specific case of a material subjected to LCF, with a non-linear stiffness, we propose a new methodology to detect and diagnose the fatigue damage using a vibration signal. This methodology is based on the second order of the cyclostationarity. (C) 2014 Elsevier Ltd. All rights reserved.
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