In *AIP Conference Proceedings*, volume 1581, pages 934–940, February, 2014. AIP Publishing.

Paper doi abstract bibtex

Paper doi abstract bibtex

The aim of this work is to measure the complex elastic tensor and Euler angles in very complex anisotropic media like austenitic steel welds, by inverse problem resolution from experimental data. The obtained experimental characteristics of the anisotropic material will be injected in a FE code developed by EDF enabling the simulation of an actual ultrasonic NDE of welds. The present work aims to provide reliable input data to the 3D future development of the code. In particular, this complex elastic tensor will allow to predict by modeling beam skewing ant attenuation in an austenitic weld. The investigation of such anisotropic media is very complex because of the directional dependency of the elastic stiffness tensor. Then we will discuss the use of a hybrid genetic algorithm to overcome this difficulty. The identification method is based on waveforms spectra reconstruction associated to a physical model describing wave propagation in plates, during underwater measurements. The entire procedure is qualified and validated using simulated data. Moreover, a comparison of the estimated elastic coefficients with literature values and ultrasonic measurements obtained in transmission is also given, at the end of the paper.

@inproceedings{alaoui-ismaili_experimental_2014, title = {Experimental determination of the complex stiffness tensor and {Euler} angles in anisotropic media using ultrasonic waves}, volume = {1581}, url = {http://scitation.aip.org/content/aip/proceeding/aipcp/10.1063/1.4864921}, doi = {10.1063/1.4864921}, abstract = {The aim of this work is to measure the complex elastic tensor and Euler angles in very complex anisotropic media like austenitic steel welds, by inverse problem resolution from experimental data. The obtained experimental characteristics of the anisotropic material will be injected in a FE code developed by EDF enabling the simulation of an actual ultrasonic NDE of welds. The present work aims to provide reliable input data to the 3D future development of the code. In particular, this complex elastic tensor will allow to predict by modeling beam skewing ant attenuation in an austenitic weld. The investigation of such anisotropic media is very complex because of the directional dependency of the elastic stiffness tensor. Then we will discuss the use of a hybrid genetic algorithm to overcome this difficulty. The identification method is based on waveforms spectra reconstruction associated to a physical model describing wave propagation in plates, during underwater measurements. The entire procedure is qualified and validated using simulated data. Moreover, a comparison of the estimated elastic coefficients with literature values and ultrasonic measurements obtained in transmission is also given, at the end of the paper.}, urldate = {2014-02-27TZ}, booktitle = {{AIP} {Conference} {Proceedings}}, publisher = {AIP Publishing}, author = {Alaoui-Ismaili, N. and Guy, P. and Chassignole, B.}, month = feb, year = {2014}, keywords = {Elastic wave attenuation, Elasticity, Materials properties, Tensor methods, Ultrasonic attenuation, Wave attenuation, anisotropy, elastic waves, inverse problems, ultrasonic testing}, pages = {934--940} }

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