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Computational Time reversal: localization of cracks
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SYSNO ASEP 0518663 Document Type A - Abstract R&D Document Type O - Ostatní Title Computational Time reversal: localization of cracks Author(s) Mračko, Michal (UT-L)
Kolman, Radek (UT-L) RID
Kober, Jan (UT-L) RID, ORCID
Převorovský, Zdeněk (UT-L) RID
Plešek, Jiří (UT-L) RID, ORCID, SAINumber of authors 5 Source Title Modelling 2019, Book of absracts. - Ostrava : Institute of Geonics of the Czech Academy of Sciences, 2019 / Blaheta R. ; Starý J. ; Sysala S. - ISBN 978-80-86407-79-1
S. 143-143Number of pages 1 s. Publication form Print - P Action Modelling 2019: International conference on mathematical modelling and computational methods in applied sciences and engineering Event date 16.09.2019 - 20.09.2019 VEvent location Olomouc Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords time reversal ; refocusing ; elastic wave propagation Subject RIV BI - Acoustics OECD category Mechanical engineering R&D Projects EF15_003/0000493 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA17-22615S GA ČR - Czech Science Foundation (CSF) Institutional support UT-L - RVO:61388998 Annotation There are several fields where Time reversal (TR) method has found its application. Our object of interest is the application in ultrasonic non-destructive testing (NDT). In NDT, this method can be used for tracing the source of vibrations in solid bodies, the source being a crack or some other defect, using a backward wave propagation for refocusing of the original source. The computational TR process consists of two steps. In the first step - the Frontal task, a model is loaded at the given place with the defined loading signal and an output is recorded at some location. In the second step
- the Reverse task, this responding signal is reversed in time and loaded back into the model so as to locate the original source (e.g. crack). Here we focus on localization of an initializing and a propagating crack in the prestressed finite element (FE) model. Besides other things, we also study how the length of the computation (number of reections of the elastic waves) in uences the
probability of localization of the crack. For numerical solution, we use the linear FE method, explicit integration in time.Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2020
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