TY - JOUR
T1 - Non-contact and non-destructive Lamb wave generation using laser-induced plasma shock wave
AU - Hosoya, Naoki
AU - Yoshinaga, Atsushi
AU - Kanda, Atsushi
AU - Kajiwara, Itsuro
N1 - Funding Information:
We thank the Japan Society for the Promotion of Science for their support under the Grants-in-Aid for Scientific Research programs (Grants-in-Aid for Scientific Research (B), Grant No. JP16H04291 and No. JP16H04286 , and Grants-in-Aid for Challenging Exploratory Research , Grant No. JP26630080 and JP17K18858 ).
Publisher Copyright:
© 2018 The Authors
PY - 2018/5
Y1 - 2018/5
N2 - This paper proposes a non-contact and non-destructive method to generate Lamb waves against a target structure using the impulse excitation force generated by laser-induced plasma (LIP). When a high power pulse laser is irradiated in air and its laser fluence exceeds 1015 W/m2, a plasma is formed. While the plasma in air expands in high speed, shock waves on the spherical surface are generated and these shock waves become the impulse excitation force against a target structure, resulting in the non-contact and non-destructive approach. A 2024 aluminum alloy plate is used as the test piece in the experiment, and the dynamic characteristics of the Lamb waves generated from LIP shock waves are measured. Phase velocity and group velocity of generated Lamb waves were compared to the calculated values from Rayleigh-Lamb frequency equations and we found that maximum error was 5% and its frequency component included at least 400 kHz. Further, we investigated the relationship between the distance from the LIP shock wave–generating location to a test piece and the dynamic characteristics of the generated Lamb waves. This method can control the amplitude and the frequency components of generated Lamb waves by changing this distance.
AB - This paper proposes a non-contact and non-destructive method to generate Lamb waves against a target structure using the impulse excitation force generated by laser-induced plasma (LIP). When a high power pulse laser is irradiated in air and its laser fluence exceeds 1015 W/m2, a plasma is formed. While the plasma in air expands in high speed, shock waves on the spherical surface are generated and these shock waves become the impulse excitation force against a target structure, resulting in the non-contact and non-destructive approach. A 2024 aluminum alloy plate is used as the test piece in the experiment, and the dynamic characteristics of the Lamb waves generated from LIP shock waves are measured. Phase velocity and group velocity of generated Lamb waves were compared to the calculated values from Rayleigh-Lamb frequency equations and we found that maximum error was 5% and its frequency component included at least 400 kHz. Further, we investigated the relationship between the distance from the LIP shock wave–generating location to a test piece and the dynamic characteristics of the generated Lamb waves. This method can control the amplitude and the frequency components of generated Lamb waves by changing this distance.
KW - Acoustic wave
KW - Lamb wave
KW - Laser-induced plasma
KW - Non-contact excitation
KW - Non-destructive evaluation
KW - Shock wave
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U2 - 10.1016/j.ijmecsci.2018.03.023
DO - 10.1016/j.ijmecsci.2018.03.023
M3 - Article
AN - SCOPUS:85044584615
SN - 0020-7403
VL - 140
SP - 486
EP - 492
JO - International Journal of Mechanical Sciences
JF - International Journal of Mechanical Sciences
ER -