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Optics Express

Optics Express

  • Editor: C. Martijin de Sterke
  • Vol. 15, Iss. 9 — Apr. 30, 2007
  • pp: 5512–5520

Finite element modeling of acoustic field induced by laser line source near surface defect

Yifei Shi, Zhonghua Shen, Xiaowu Ni, Jian Lu, and Jianfei Guan  »View Author Affiliations


Optics Express, Vol. 15, Issue 9, pp. 5512-5520 (2007)
http://dx.doi.org/10.1364/OE.15.005512


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Abstract

A numerical model of acoustic field induced by laser line source near the surface defect is established by finite element method (FEM), where a surface notch of rectangular shape has been introduced to represent the fatigue defect for the convenience of modeling. After calculating numerically the transient displacement distributions, which are generated by the laser irradiation, the ultrasonic wave modes on the surface and in the body of the plate material are presented in details. The longitudinal, transverse and surface acoustic waves (SAWs) excited by laser pulses near surface notch are compared under the situations that the notch depths are different. As the notch depth increases, the directivity of the bulk waves generation changes greatly. The amplitude of the reflected SAW rises observably at the same time, which is observed experimentally when the laser source is shifted near the surface notch in scanning laser line source (SLLS) measurement. Another effect induced by the surface notch is the time lag of the transmitted SAW pulse with respect to the original incident pulse. These phenomena can be explained from the results. The conclusions can be used to surface notch depth evaluation.

© 2007 Optical Society of America

OCIS Codes
(140.6810) Lasers and laser optics : Thermal effects

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: December 13, 2006
Revised Manuscript: April 4, 2007
Manuscript Accepted: April 9, 2007
Published: April 20, 2007

Citation
Yifei Shi, Zhonghua Shen, Xiaowu Ni, Jian Lu, and Jianfei Guan, "Finite element modeling of acoustic field induced by laser line source near surface defect," Opt. Express 15, 5512-5520 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-9-5512


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References

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