Une méthode de mesure de la dispersion et de l'amortissement des ondes longitudinales dans une barre élastique ou faiblement viscoélastique est présentée. Elle est fondée sur l'analyse des résonances présentes dans le spectre du signal de la déformation produite par un chargement indéterminé. Appliquée à une barre d'aluminium, elle permet la mesure de la dispersion pour des fréquences allant jusqu'à 60 kHz. On vérifie la grande qualité de la relation de dispersion ainsi obtenue en testant la précision du transport des ondes calculé avec cette relation.
Dispersion and attenuation of longitudinal waves in elastic or weakly viscoelastic rods are measured by analysing the resonant frequencies present in the strain spectrum due to an unknown loading. The method takes the finite measuring time of the test into account. It is applied to an aluminium bar, in which the dispersion relation is identified very accurately at frequencies up to 60 kHz.
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Keywords: waves, dispersion relation, complex Young's modulus, Hopkinson bar, dynamics, signal processing
Ramzi Othman 1 ; Robert H. Blanc 2 ; Marie-Noëlle Bussac 3 ; Pierre Collet 3 ; Gérard Gary 1
@article{CRMECA_2002__330_12_849_0, author = {Ramzi Othman and Robert H. Blanc and Marie-No\"elle Bussac and Pierre Collet and G\'erard Gary}, title = {Identification de la relation de dispersion dans les barres}, journal = {Comptes Rendus. M\'ecanique}, pages = {849--855}, publisher = {Elsevier}, volume = {330}, number = {12}, year = {2002}, doi = {10.1016/S1631-0721(02)01541-3}, language = {fr}, }
TY - JOUR AU - Ramzi Othman AU - Robert H. Blanc AU - Marie-Noëlle Bussac AU - Pierre Collet AU - Gérard Gary TI - Identification de la relation de dispersion dans les barres JO - Comptes Rendus. Mécanique PY - 2002 SP - 849 EP - 855 VL - 330 IS - 12 PB - Elsevier DO - 10.1016/S1631-0721(02)01541-3 LA - fr ID - CRMECA_2002__330_12_849_0 ER -
%0 Journal Article %A Ramzi Othman %A Robert H. Blanc %A Marie-Noëlle Bussac %A Pierre Collet %A Gérard Gary %T Identification de la relation de dispersion dans les barres %J Comptes Rendus. Mécanique %D 2002 %P 849-855 %V 330 %N 12 %I Elsevier %R 10.1016/S1631-0721(02)01541-3 %G fr %F CRMECA_2002__330_12_849_0
Ramzi Othman; Robert H. Blanc; Marie-Noëlle Bussac; Pierre Collet; Gérard Gary. Identification de la relation de dispersion dans les barres. Comptes Rendus. Mécanique, Volume 330 (2002) no. 12, pp. 849-855. doi : 10.1016/S1631-0721(02)01541-3. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/S1631-0721(02)01541-3/
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