caa a22 4500 606172807 CHVBK 20210128100730.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s10921-015-0278-8 doi (NATIONALLICENCE)springer-10.1007/s10921-015-0278-8 Finite Element Modelling of Cracks as Acoustic Emission Sources [Elektronische Daten] [Markus Sause, Stefan Richler] This paper presents results for a new acoustic emission crack source model based on a finite element modelling approach which calculates the dynamic displacement field during crack formation. The specimen modelled is statically loaded until conditions for crack growth as defined by a failure criterion are fulfilled. Subsequently, crack growth is modelled by local degradation of the material stiffness utilizing a cohesive zone element approach. The displacements due to crack growth generate the acoustic emission signal and allow detailed examination of the principles of acoustic emission sources operation. Subsequent to crack growth signal propagation is modeled. The signal propagation is modeled superimposed on the static displacement field. The presented model comprises a multi-scale and multi-physics approach to consider the signal propagation from source to sensor, the piezoelectric conversion of the elastic wave to an electric signal and the interaction to the acquisition electronics. Validation of the modeling approach is done by investigating the acoustic emission signals of micromechanical experiments. Using a specifically developed load stage, carbon fiber filament failure and matrix cracking can be prepared as model sources. A comparison of the experimental signals to the modeled signals shows good quantitative agreement in signal amplitude and frequency content. A comparison between the present modeling work and analytical theories demonstrates the substantial differences not considered in previous modeling work of acoustic emission sources. The Author(s), 2015 Finite element modeling nationallicence Acoustic emission nationallicence Fracture mechanics nationallicence Cohesive zone elements nationallicence Sause Markus Institute for Physics, Experimental Physics II, University of Augsburg, 86135, Augsburg, Germany aut Richler Stefan Institute for Physics, Experimental Physics II, University of Augsburg, 86135, Augsburg, Germany aut Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/1(2015-03-01), 1-13 0195-9298 34:1<1 2015 34 10921 https://doi.org/10.1007/s10921-015-0278-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10921-015-0278-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sause Markus Institute for Physics, Experimental Physics II, University of Augsburg, 86135, Augsburg, Germany aut NATIONALLICENCE 700 1- Richler Stefan Institute for Physics, Experimental Physics II, University of Augsburg, 86135, Augsburg, Germany aut NATIONALLICENCE 773 0- Journal of Nondestructive Evaluation Springer US; http://www.springer-ny.com 34/1(2015-03-01), 1-13 0195-9298 34:1<1 2015 34 10921