Abstract：
:The numerical studies conducted in this paper are based on our previous research (Chen et al., 2017); through use of the spectral element method, parametric sensitivity studies of Nonlinear Coda Wave Interferometry (NCWI) are established here and divided into two parts. In the first part, CWI observables are found to be proportional to the product of the changes in elastic modulus within the Effective Damaged Zone (EDZ) and the EDZ surface area. The modifications to intrinsic properties are quantified via an overall wave velocity variation, as probed by a reverberated coda wave. However, for high-level changes, CWI may fail due to meaningless decorrelation values. In this context, parametric studies are conducted to yield a maximum range for EDZ contrast and area. To further validate these observations using a more realistic numerical model, instead of introducing a homogeneous EDZ model, the second part of this paper adds random cracks with random orientations into the EDZ of a material sample. The influence of a strong pump wave on localized nonlinear damage is reestablished; results show that the cracks added into the EDZ reduce the property changes required to match the previous experimental dataset.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Chen G,Pageot D,Abraham O,Zhang Y,Chekroun M,Tournat Vdoi
10.1016/j.ultras.2019.105968subject
Has Abstractpub_date
2019-11-01 00:00:00pages
105968eissn
0041-624Xissn
1874-9968pii
S0041-624X(19)30290-2journal_volume
99pub_type
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