期刊
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
卷 18, 期 5-6, 页码 1889-1902出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921719828271
关键词
Prognostics and health management; online monitoring; remaining fatigue life estimation; nonlinear ultrasonic modulation; lead zirconate titanate transducers
资金
- Engineering Research Center Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2017R1A5A1014883]
- National Research Foundation of Korea (NRF) - Ministry of Education [2016R1A6A3A11932283]
- National Research Foundation of Korea [2016R1A6A3A11932283] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This article presents an online remaining fatigue life estimation (prognosis) technique using nonlinear ultrasonic modulation. When two ultrasonic inputs at two distinct frequencies are introduced to a structure with a fatigue crack, modulation components at the sum and difference of input frequencies are generated owing to crack opening and closing. First, a fatigue index is defined for prognosis and extracted from nonlinear ultrasonic modulation measurement. Subsequently, it is shown that the fatigue index is expressed as a simple power function of loading cycles applied to a target structure based on the Nazarov-Sutin and Paris-Erdogan theories. Then, the real-time remaining fatigue life estimation method is proposed by fitting the power function to online data obtained from the target structure. The performance of the proposed prognosis technique is evaluated using either notched or welded aluminum (6061-T6) plate specimens.
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