Robust mixed finite element simulations of interactions of ultrasonic waves with cracks
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27240%2F16%3A86100169" target="_blank" >RIV/61989100:27240/16:86100169 - isvavai.cz</a>
Alternative codes found
RIV/61989100:27740/16:86100169
Result on the web
<a href="http://www.ndt.net/events/EWSHM2016/app/content/Paper/251_Lukas.pdf" target="_blank" >http://www.ndt.net/events/EWSHM2016/app/content/Paper/251_Lukas.pdf</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Robust mixed finite element simulations of interactions of ultrasonic waves with cracks
Original language description
We are faced with interactions of ultrasonic waves with cracks in thin plates. These are important means in structural health monitoring of aircrafts. We present a couple of finite element models that are validated by means of Lamb dispersive (frequency-velocity) curves. In 2d it turns out that membranes and Kirchhoff plates imitate well the low frequency case of the lowest-order shear and bending modes, respectively. We switch to 3d displacement finite elements enhanced with higher-order ansatz functions in the thickness direction. These imitate properly the shear-horizontal modes, however, they suffer from the locking effect in case of the Lamb modes. We end up with 3d mixed elastic elements, which are referred to as tangential-displacements and normal-normal-stresses (TD-NNS), recently proposed and analyzed by Astrid Pechstein (born Sinwel) and Joachim Sch oberl at TU Vienna. We show that these new elements cover the whole spectrum of elastic waves including higher-order Lamb waves. Finally, relying on TD-NNS finite elements and a Newmark time discretization scheme we present simulations of interaction of ultrasonic waves with cracks.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
BA - General mathematics
OECD FORD branch
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Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
8th European Workshop on Structural Health Monitoring, EWSHM 2016
ISBN
978-1-5108-2793-6
ISSN
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e-ISSN
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Number of pages
8
Pages from-to
1154-1161
Publisher name
NDT.net
Place of publication
Bad Breisig
Event location
Bilbao
Event date
Jul 5, 2016
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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