Fatigue damage detection using cyclostationarity

• Published in: Mechanical systems and signal processing Vol. 58-59; pp. 128 - 142
• Main Authors: Boungou, D., Guillet, F., Badaoui, M. El, Lyonnet, P., Rosario, T.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.06.2015
• Subjects: Breathing; Breathing cracks; Cantilever beam; Cracks; Cyclostationarity; Fatigue damage; Fatigue failure; Flaw detection; Low cycle fatigue; Non-linearity of the stiffness; Nonlinearity; Stiffness; Vibration; Non-linearity of the stiffness; Breathing cracks; Cantilever beam; Fatigue damage; Cyclostationarity
• ISSN: 0888-3270; 1096-1216
• DOI: 10.1016/j.ymssp.2014.11.010

In this paper, we present the second-order of cyclostationarity to detect and diagnose the fatigue damage of the stainless steel 316l 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. •Robust diagnostic proposal of damage based on vibrational measurement with particular regard to the second-order of cyclostationarity.•Cyclostationarity analysis for crack detection.•Mechanical simulation of damage in the case of a cantilever beam subjected to low cycle fatigue.•Experimental crack detection by cyclostationarity.